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Ibl V, Peters J, Stoger E, Arcalís E. Imaging the ER and Endomembrane System in Cereal Endosperm. Methods Mol Biol 2024; 2772:249-260. [PMID: 38411819 DOI: 10.1007/978-1-0716-3710-4_18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
The cereal endosperm is a complex structure comprising distinct cell types, characterized by specialized organelles for the accumulation of storage proteins. Protein trafficking in these cells is complicated by the presence of several different storage organelles including protein bodies (PBs) derived from the endoplasmic reticulum (ER) and dynamic protein storage vacuoles (PSVs). In addition, trafficking may follow a number of different routes depending on developmental stage, showing that the endomembrane system is capable of massive reorganization. Thus, developmental sequences involve progressive changes of the endomembrane system of endosperm tissue and are characterized by a high structural plasticity and endosomal activity.Given the technical dexterity required to access endosperm tissue and study subcellular structures and SSP trafficking in cereal seeds, static images are the state of the art providing a bulk of information concerning the cellular composition of seed tissue. In view of the highly dynamic endomembrane system in cereal endosperm cells, it is reasonable to expect that live cell imaging will help to characterize the spatial and temporal changes of the endomembrane system. The high resolution achieved with electron microscopy perfectly complements the live cell imaging.We therefore established an imaging platform for TEM as well as for live cell imaging. Here, we describe the preparation of different cereal seed tissues for live cell imaging concomitant with immunolocalization studies and ultrastructure.
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Affiliation(s)
- Verena Ibl
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
- Molecular Systems Biology, Faculty of Life Sciences, University of Vienna, Vienna, Austria
| | - Jenny Peters
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Eva Stoger
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Elsa Arcalís
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria.
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Qin G, Qu M, Jia B, Wang W, Luo Z, Song CP, Tao WA, Wang P. FAT-switch-based quantitative S-nitrosoproteomics reveals a key role of GSNOR1 in regulating ER functions. Nat Commun 2023; 14:3268. [PMID: 37277371 PMCID: PMC10241878 DOI: 10.1038/s41467-023-39078-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 05/26/2023] [Indexed: 06/07/2023] Open
Abstract
Reversible protein S-nitrosylation regulates a wide range of biological functions and physiological activities in plants. However, it is challenging to quantitively determine the S-nitrosylation targets and dynamics in vivo. In this study, we develop a highly sensitive and efficient fluorous affinity tag-switch (FAT-switch) chemical proteomics approach for S-nitrosylation peptide enrichment and detection. We quantitatively compare the global S-nitrosylation profiles in wild-type Arabidopsis and gsnor1/hot5/par2 mutant using this approach, and identify 2,121 S-nitrosylation peptides in 1,595 protein groups, including many previously unrevealed S-nitrosylated proteins. These are 408 S-nitrosylated sites in 360 protein groups showing an accumulation in hot5-4 mutant when compared to wild type. Biochemical and genetic validation reveal that S-nitrosylation at Cys337 in ER OXIDOREDUCTASE 1 (ERO1) causes the rearrangement of disulfide, resulting in enhanced ERO1 activity. This study offers a powerful and applicable tool for S-nitrosylation research, which provides valuable resources for studies on S-nitrosylation-regulated ER functions in plants.
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Affiliation(s)
- Guochen Qin
- Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, 200032, Shanghai, China
- Peking University Institute of Advanced Agricultural Sciences, Shandong Laboratory of Advanced Agricultural Sciences at Weifang, 261000, Weifang, Shandong, China
| | - Menghuan Qu
- Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, 200032, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Bei Jia
- Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, 200032, Shanghai, China
| | - Wei Wang
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Zhuojun Luo
- Department of Biochemistry, Purdue University, West Lafayette, IN, 47907, USA
| | - Chun-Peng Song
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - W Andy Tao
- Department of Biochemistry, Purdue University, West Lafayette, IN, 47907, USA
- Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA
| | - Pengcheng Wang
- Institute of Advanced Biotechnology and School of Life Sciences, Southern University of Science and Technology, 518055, Shenzhen, China.
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3
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Liu Y, Wang X, Chen H, Wu T, Cao Y, Liu Z. Silencing the Catalase Gene with SiRNA for Enhanced Chemodynamic Therapy. ACS APPLIED MATERIALS & INTERFACES 2023; 15:8937-8945. [PMID: 36751111 DOI: 10.1021/acsami.2c20144] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Chemodynamic therapy (CDT) has been emerging as a promising strategy for cancer treatment. But the CDT efficiency is restricted by the insufficient intracellular hydrogen peroxide (H2O2) level. Herein, we present a method for H2O2 accumulation in tumor cells by silencing the catalase (CAT) gene with siRNA to achieve enhanced CDT. Cu-siRNA nanocomposites are fabricated by self-assembly of Cu2+ and CAT siRNA and then modified with hyaluronic acid (HA) for active tumor targeting. After tumor cell uptake, the released Cu2+ is reduced by highly expressed glutathione (GSH) to Cu+, which then catalyzes H2O2 to produce toxic hydroxyl radicals (•OH) to kill tumor cells. CAT siRNA can efficiently silence the CAT mRNA to inhibit the consumption of H2O2, resulting in H2O2 accumulation. The Cu2+-mediated GSH elimination and siRNA-induced endogenous H2O2 enrichment both potentiate CDT. Cu-siRNA@HA exhibits good biocompatibility and therapeutic efficiency. This work thus paves a new way to supply H2O2 in CDT and may hold potential for clinical application.
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Affiliation(s)
- Ying Liu
- College of Health Science and Engineering, Hubei University, Wuhan 430062, P. R. China
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China
| | - Xin Wang
- College of Health Science and Engineering, Hubei University, Wuhan 430062, P. R. China
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China
| | - Hanjun Chen
- College of Health Science and Engineering, Hubei University, Wuhan 430062, P. R. China
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China
| | - Tingting Wu
- College of Health Science and Engineering, Hubei University, Wuhan 430062, P. R. China
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China
| | - Yu Cao
- College of Health Science and Engineering, Hubei University, Wuhan 430062, P. R. China
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China
| | - Zhihong Liu
- College of Health Science and Engineering, Hubei University, Wuhan 430062, P. R. China
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China
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4
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Onda Y, Okino T. Thiol-disulfide oxidoreductase PDI1;1 regulates actin structures in Oryza sativa root cells. FEBS Lett 2022; 596:3015-3023. [PMID: 35781879 DOI: 10.1002/1873-3468.14445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 12/14/2022]
Abstract
The polarized and dynamic actin cytoskeleton is essential for root cell growth. Here, we report the key role of thiol-disulfide oxidoreductase PDI1;1 in actin structures. Microscopic analyses revealed that after Oryza sativa roots were exposed to H2 O2 , both actin and PDI1;1 were depolarized and arranged in a meshwork. In H2 O2 -exposed cells, actin formed intermolecularly disulfide-bonded high-molecular-weight structures, which were thiol-trapped by PDI1;1. Recombinant PDI1;1 exhibited the ability to recognize actin in an in vitro binding assay. During recovery from H2 O2 exposure, the amount of disulfide-bonded high-molecular-weight structures of actin decreased over time, but deficiency of PDI1;1 inhibited the decrease. These results suggest a PDI1;1-dependent pathway that reduces disulfide bonds in high-molecular-weight structures of actin, thus promoting their degradation.
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Affiliation(s)
- Yayoi Onda
- Graduate School of Agriculture, Ehime University, Matsuyama, Japan
| | - Tomoya Okino
- Faculty of Agriculture, Ehime University, Matsuyama, Japan
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Ugalde JM, Aller I, Kudrjasova L, Schmidt RR, Schlößer M, Homagk M, Fuchs P, Lichtenauer S, Schwarzländer M, Müller-Schüssele SJ, Meyer AJ. Endoplasmic reticulum oxidoreductin provides resilience against reductive stress and hypoxic conditions by mediating luminal redox dynamics. THE PLANT CELL 2022; 34:4007-4027. [PMID: 35818121 PMCID: PMC9516139 DOI: 10.1093/plcell/koac202] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 07/05/2022] [Indexed: 05/28/2023]
Abstract
Oxidative protein folding in the endoplasmic reticulum (ER) depends on the coordinated action of protein disulfide isomerases and ER oxidoreductins (EROs). Strict dependence of ERO activity on molecular oxygen as the final electron acceptor implies that oxidative protein folding and other ER processes are severely compromised under hypoxia. Here, we isolated viable Arabidopsis thaliana ero1 ero2 double mutants that are highly sensitive to reductive stress and hypoxia. To elucidate the specific redox dynamics in the ER in vivo, we expressed the glutathione redox potential (EGSH) sensor Grx1-roGFP2iL-HDEL with a midpoint potential of -240 mV in the ER of Arabidopsis plants. We found EGSH values of -241 mV in wild-type plants, which is less oxidizing than previously estimated. In the ero1 ero2 mutants, luminal EGSH was reduced further to -253 mV. Recovery to reductive ER stress induced by dithiothreitol was delayed in ero1 ero2. The characteristic signature of EGSH dynamics in the ER lumen triggered by hypoxia was affected in ero1 ero2 reflecting a disrupted balance of reductive and oxidizing inputs, including nascent polypeptides and glutathione entry. The ER redox dynamics can now be dissected in vivo, revealing a central role of EROs as major redox integrators to promote luminal redox homeostasis.
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Affiliation(s)
| | - Isabel Aller
- INRES-Chemical Signalling, University of Bonn, D-53113 Bonn, Germany
| | - Lika Kudrjasova
- INRES-Chemical Signalling, University of Bonn, D-53113 Bonn, Germany
| | - Romy R Schmidt
- Plant Biotechnology, Bielefeld University, D-33615 Bielefeld, Germany
| | - Michelle Schlößer
- INRES-Chemical Signalling, University of Bonn, D-53113 Bonn, Germany
| | - Maria Homagk
- INRES-Chemical Signalling, University of Bonn, D-53113 Bonn, Germany
| | | | - Sophie Lichtenauer
- Institute for Biology and Biotechnology of Plants, University of Münster, D-48143 Münster, Germany
| | - Markus Schwarzländer
- Institute for Biology and Biotechnology of Plants, University of Münster, D-48143 Münster, Germany
| | - Stefanie J Müller-Schüssele
- INRES-Chemical Signalling, University of Bonn, D-53113 Bonn, Germany
- Molecular Botany, Department of Biology, TU Kaiserslautern, D-67663, Kaiserslautern, Germany
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Zhao D, Zhang C, Li Q, Liu Q. Genetic control of grain appearance quality in rice. Biotechnol Adv 2022; 60:108014. [PMID: 35777622 DOI: 10.1016/j.biotechadv.2022.108014] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 05/27/2022] [Accepted: 06/23/2022] [Indexed: 02/08/2023]
Abstract
Grain appearance, one of the key determinants of rice quality, reflects the ability to attract consumers, and is characterized by four major properties: grain shape, chalkiness, transparency, and color. Mining of valuable genes, genetic mechanisms, and breeding cultivars with improved grain appearance are essential research areas in rice biology. However, grain appearance is a complex and comprehensive trait, making it challenging to understand the molecular details, and therefore, achieve precise improvement. This review highlights the current findings of grain appearance control, including a detailed description of the key genes involved in the formation of grain appearance, and the major environmental factors affecting chalkiness. We also discuss the integration of current knowledge on valuable genes to enable accurate breeding strategies for generation of rice grains with superior appearance quality.
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Affiliation(s)
- Dongsheng Zhao
- Key Laboratory of Crop Genomics and Molecular Breeding of Jiangsu Province, State Key Laboratory of Hybrid Rice, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Yangzhou University, Yangzhou 225009, China; Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Jiangsu Key Laboratory of Crop Genetics and Physiology, Yangzhou University, Yangzhou 225009, China
| | - Changquan Zhang
- Key Laboratory of Crop Genomics and Molecular Breeding of Jiangsu Province, State Key Laboratory of Hybrid Rice, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Yangzhou University, Yangzhou 225009, China
| | - Qianfeng Li
- Key Laboratory of Crop Genomics and Molecular Breeding of Jiangsu Province, State Key Laboratory of Hybrid Rice, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Yangzhou University, Yangzhou 225009, China
| | - Qiaoquan Liu
- Key Laboratory of Crop Genomics and Molecular Breeding of Jiangsu Province, State Key Laboratory of Hybrid Rice, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Yangzhou University, Yangzhou 225009, China; Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Jiangsu Key Laboratory of Crop Genetics and Physiology, Yangzhou University, Yangzhou 225009, China.
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7
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Hori K, Okunishi T, Nakamura K, Iijima K, Hagimoto M, Hayakawa K, Shu K, Ikka T, Yamashita H, Yamasaki M, Takeuchi Y, Koyama S, Tsujii Y, Kayano T, Ishii T, Kumamaru T, Kawagoe Y, Yamamoto T. Genetic Background Negates Improvements in Rice Flour Characteristics and Food Processing Properties Caused by a Mutant Allele of the PDIL1-1 Seed Storage Protein Gene. RICE (NEW YORK, N.Y.) 2022; 15:13. [PMID: 35247122 PMCID: PMC8898210 DOI: 10.1186/s12284-022-00560-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 02/08/2022] [Indexed: 05/18/2023]
Abstract
Phenotypic differences among breeding lines that introduce the same superior gene allele can be a barrier to effective development of cultivars with desirable traits in some crop species. For example, a deficient mutation of the Protein Disulfide Isomerase Like 1-1 (PDIL1-1) gene can cause accumulation of glutelin seed storage protein precursors in rice endosperm, and improves rice flour characteristics and food processing properties. However, the gene must be expressed to be useful. A deficient mutant allele of PDIL1-1 was introduced into two rice cultivars with different genetic backgrounds (Koshihikari and Oonari). The grain components, agronomic traits, and rice flour and food processing properties of the resulting lines were evaluated. The two breeding lines had similar seed storage protein accumulation, amylose content, and low-molecular-weight metabolites. However, only the Koshihikari breeding line had high flour quality and was highly suitable for rice bread, noodles, and sponge cake, evidence of the formation of high-molecular-weight protein complexes in the endosperm. Transcriptome analysis revealed that mRNA levels of fourteen PDI, Ero1, and BiP genes were increased in the Koshihikari breeding line, whereas this change was not observed in the Oonari breeding line. We elucidated part of the molecular basis of the phenotypic differences between two breeding lines possessing the same mutant allele in different genetic backgrounds. The results suggest that certain genetic backgrounds can negate the beneficial effect of the PDIL1-1 mutant allele. Better understanding of the molecular basis for such interactions may accelerate future breeding of novel rice cultivars to meet the strong demand for gluten-free foods.
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Affiliation(s)
- Kiyosumi Hori
- National Agricultural and Food Research Organization (NARO), Tsukuba, 305-8518, Japan.
- National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan.
| | - Tomoya Okunishi
- National Agricultural and Food Research Organization (NARO), Tsukuba, 305-8518, Japan
| | - Kenji Nakamura
- Cereal Science Research Center of Tsukuba, Nisshin Flour Milling Inc, Tsukuba, 300-2611, Japan
| | - Ken Iijima
- National Agricultural and Food Research Organization (NARO), Tsukuba, 305-8518, Japan
- National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
| | - Masahiro Hagimoto
- Cereal Science Research Center of Tsukuba, Nisshin Flour Milling Inc, Tsukuba, 300-2611, Japan
| | - Katsuyuki Hayakawa
- Cereal Science Research Center of Tsukuba, Nisshin Flour Milling Inc, Tsukuba, 300-2611, Japan
| | - Koka Shu
- National Agricultural and Food Research Organization (NARO), Tsukuba, 305-8518, Japan
- National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
| | - Takashi Ikka
- National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
- Faculty of Agriculture, Shizuoka University, Shizuoka, 422-8529, Japan
| | - Hiroto Yamashita
- National Agricultural and Food Research Organization (NARO), Tsukuba, 305-8518, Japan
- Faculty of Agriculture, Shizuoka University, Shizuoka, 422-8529, Japan
| | - Masanori Yamasaki
- Food Resources Education and Research Center, Kobe University, Kasai, 675-2103, Japan
| | - Yoshinobu Takeuchi
- National Agricultural and Food Research Organization (NARO), Tsukuba, 305-8518, Japan
| | - Shota Koyama
- Department of Agricultural Chemistry, Tokyo University of Agriculture, Tokyo, 156-8502, Japan
| | - Yoshimasa Tsujii
- Department of Agricultural Chemistry, Tokyo University of Agriculture, Tokyo, 156-8502, Japan
| | - Toshiaki Kayano
- National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
| | - Takuro Ishii
- National Agricultural and Food Research Organization (NARO), Tsukuba, 305-8518, Japan
| | | | - Yasushi Kawagoe
- National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
| | - Toshio Yamamoto
- National Agricultural and Food Research Organization (NARO), Tsukuba, 305-8518, Japan
- National Institute of Agrobiological Sciences, Tsukuba, 305-8602, Japan
- Institute of Plant Science and Resources, Okayama University, Kurashiki, 710-0046, Japan
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Fan F, Zhang Q, Zhang Y, Huang G, Liang X, Wang CC, Wang L, Lu D. Two protein disulfide isomerase subgroups work synergistically in catalyzing oxidative protein folding. PLANT PHYSIOLOGY 2022; 188:241-254. [PMID: 34609517 PMCID: PMC8774737 DOI: 10.1093/plphys/kiab457] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 08/31/2021] [Indexed: 05/13/2023]
Abstract
Disulfide bonds play essential roles in the folding of secretory and plasma membrane proteins in the endoplasmic reticulum (ER). In eukaryotes, protein disulfide isomerase (PDI) is an enzyme catalyzing the disulfide bond formation and isomerization in substrates. The Arabidopsis (Arabidopsis thaliana) genome encodes diverse PDIs including structurally distinct subgroups PDI-L and PDI-M/S. It remains unclear how these AtPDIs function to catalyze the correct disulfide formation. We found that one Arabidopsis ER oxidoreductin-1 (Ero1), AtERO1, can interact with multiple PDIs. PDI-L members AtPDI2/5/6 mainly serve as an isomerase, while PDI-M/S members AtPDI9/10/11 are more efficient in accepting oxidizing equivalents from AtERO1 and catalyzing disulfide bond formation. Accordingly, the pdi9/10/11 triple mutant exhibited much stronger inhibition than pdi1/2/5/6 quadruple mutant under dithiothreitol treatment, which caused disruption of disulfide bonds in plant proteins. Furthermore, AtPDI2/5 work synergistically with PDI-M/S members in relaying disulfide bonds from AtERO1 to substrates. Our findings reveal the distinct but overlapping roles played by two structurally different AtPDI subgroups in oxidative protein folding in the ER.
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Affiliation(s)
- Fenggui Fan
- State Key Laboratory of Plant Genomics, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050021, China
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, Xi'an, 710069, China
| | - Qiao Zhang
- Hebei Collaboration Innovation Center for Cell Signaling, Hebei Normal University, Shijiazhuang 050024, China
| | - Yini Zhang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guozhong Huang
- State Key Laboratory of Plant Genomics, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050021, China
| | - Xuelian Liang
- Hebei Collaboration Innovation Center for Cell Signaling, Hebei Normal University, Shijiazhuang 050024, China
| | - Chih-chen Wang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lei Wang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dongping Lu
- State Key Laboratory of Plant Genomics, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050021, China
- Hebei Collaboration Innovation Center for Cell Signaling, Hebei Normal University, Shijiazhuang 050024, China
- Author for communication:
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He W, Wang L, Lin Q, Yu F. Rice seed storage proteins: Biosynthetic pathways and the effects of environmental factors. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2021; 63:1999-2019. [PMID: 34581486 DOI: 10.1111/jipb.13176] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 09/27/2021] [Indexed: 05/02/2023]
Abstract
Rice (Oryza sativa L.) is the most important food crop for at least half of the world's population. Due to improved living standards, the cultivation of high-quality rice for different purposes and markets has become a major goal. Rice quality is determined by the presence of many nutritional components, including seed storage proteins (SSPs), which are the second most abundant nutrient components of rice grains after starch. Rice SSP biosynthesis requires the participation of multiple organelles and is influenced by the external environment, making it challenging to understand the molecular details of SSP biosynthesis and improve rice protein quality. In this review, we highlight the current knowledge of rice SSP biosynthesis, including a detailed description of the key molecules involved in rice SSP biosynthetic processes and the major environmental factors affecting SSP biosynthesis. The effects of these factors on SSP accumulation and their contribution to rice quality are also discussed based on recent findings. This recent knowledge suggests not only new research directions for exploring rice SSP biosynthesis but also innovative strategies for breeding high-quality rice varieties.
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Affiliation(s)
- Wei He
- National Engineering Laboratory for Rice and By-product Deep Processing, Central South University of Forestry and Technology, Changsha, 410004, China
- College of Biology, State Key Laboratory of Chemo/Biosensing and Chemometrics, and Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, Hunan University, Changsha, 410082, China
| | - Long Wang
- College of Biology, State Key Laboratory of Chemo/Biosensing and Chemometrics, and Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, Hunan University, Changsha, 410082, China
| | - Qinlu Lin
- National Engineering Laboratory for Rice and By-product Deep Processing, Central South University of Forestry and Technology, Changsha, 410004, China
| | - Feng Yu
- College of Biology, State Key Laboratory of Chemo/Biosensing and Chemometrics, and Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, Hunan University, Changsha, 410082, China
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10
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Matsusaka H, Fukuda M, Elakhdar A, Kumamaru T. Serine hydroxymethyltransferase participates in the synthesis of cysteine-rich storage proteins in rice seed. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2021; 312:111049. [PMID: 34620446 DOI: 10.1016/j.plantsci.2021.111049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 07/12/2021] [Accepted: 08/30/2021] [Indexed: 06/13/2023]
Abstract
The low level of cysteine-rich proteins (lcrp) mutation indicates a decrease in cysteine-rich (CysR) prolamines, α-globulin, and glutelin. To identify the causing factor of lcrp mutation, to elucidate its function, and to elucidate the role of CysR proteins in the formation of protein bodies (PBs), lcrp mutant was analyzed. A linkage map of the LCRP gene was constructed and genomic DNA sequencing of a predicted gene within the mapped region demonstrated that LCRP encodes a serine hydroxymethyltransferase, which participates in glycine-serine interconversion of one-carbon metabolism in the sulfur assimilation pathway. The levels of l-Ser, Gly, and Met in the sulfur assimilation pathway in the lcrp seeds increased significantly compared to that in the wildtype (WT). As the lcrp mutation influences the growth of shoot and root, the effects of the addition to the medium of amino acids and other compounds on the sulfur assimilation pathway were studied. Electron-lucent PBs surrounded by ribosome-attached membranes were observed accumulating cysteine-poor prolamines in the lcrp seeds. Additionally, glutelin-containing PBs were smaller and distorted in the lcrp seeds compared to those in the WT. These analyses of PBs in the lcrp seeds suggest that cysteine-rich proteins play an important role in the formation of PBs in rice.
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Affiliation(s)
- Hiroaki Matsusaka
- Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Motooka 744, Fukuoka 819-0395, Japan
| | - Masako Fukuda
- Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Motooka 744, Fukuoka 819-0395, Japan
| | - Ammar Elakhdar
- Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Motooka 744, Fukuoka 819-0395, Japan; Field Crops Research Institute, Agricultural Research Center, Giza 12619, Egypt
| | - Toshihiro Kumamaru
- Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Motooka 744, Fukuoka 819-0395, Japan.
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PDI-Regulated Disulfide Bond Formation in Protein Folding and Biomolecular Assembly. Molecules 2020; 26:molecules26010171. [PMID: 33396541 PMCID: PMC7794689 DOI: 10.3390/molecules26010171] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 12/25/2020] [Accepted: 12/28/2020] [Indexed: 02/06/2023] Open
Abstract
Disulfide bonds play a pivotal role in maintaining the natural structures of proteins to ensure their performance of normal biological functions. Moreover, biological molecular assembly, such as the gluten network, is also largely dependent on the intermolecular crosslinking via disulfide bonds. In eukaryotes, the formation and rearrangement of most intra- and intermolecular disulfide bonds in the endoplasmic reticulum (ER) are mediated by protein disulfide isomerases (PDIs), which consist of multiple thioredoxin-like domains. These domains assist correct folding of proteins, as well as effectively prevent the aggregation of misfolded ones. Protein misfolding often leads to the formation of pathological protein aggregations that cause many diseases. On the other hand, glutenin aggregation and subsequent crosslinking are required for the formation of a rheologically dominating gluten network. Herein, the mechanism of PDI-regulated disulfide bond formation is important for understanding not only protein folding and associated diseases, but also the formation of functional biomolecular assembly. This review systematically illustrated the process of human protein disulfide isomerase (hPDI) mediated disulfide bond formation and complemented this with the current mechanism of wheat protein disulfide isomerase (wPDI) catalyzed formation of gluten networks.
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Fan F, Zhang Q, Lu D. Identification of N-glycosylation sites on AtERO1 and AtERO2 using a transient expression system. Biochem Biophys Res Commun 2020; 533:481-485. [PMID: 32977945 DOI: 10.1016/j.bbrc.2020.09.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 09/09/2020] [Indexed: 02/06/2023]
Abstract
N-glycosylation is an important protein modification that generally occurs at the Asn residue in an Asn-X-Ser/Thr sequon. Ero1 and its homologs play key roles in catalyzing the oxidative folding in the endoplasmic reticulum (ER). Recently, we found that Arabidopsis (Arabidopsis thaliana) ERO1 and AtERO2 displayed different characteristics in catalyzing oxidative protein folding in the ER. All known Ero1s are glycosylated proteins, including AtERO1 and AtERO2 that were analyzed when they were transiently translated in mammalian cells. However, the exact N-glycosylation sites on AtERO1 and AtERO2 remains to be determined. In this work, using a plant transient expression system, we identified the N-glycosylation sites on both AtERO1 and AtERO2. We found that AtERO1 has one N-glycosylation site, while AtERO2 contains two, all in the N-X-S/T sequons. Interestingly, we found that Ero1 homologs from human, rice, soybean and Arabidopsis, all have a conserved N-glycosylation site near the inner active site that reduces molecular oxygen and provides the oxidizing equivalents. The identification of N-glycosylation sites on AtERO1/2 proteins will help understand the function of N-glycosylation not only in AtERO1/2, but also in other Ero1 homologs.
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Affiliation(s)
- Fenggui Fan
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, Xi'an, Shaanxi, 710069, China; Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei, 050021, China. https://orcid.org/0000-0003-4157-9330
| | - Qiao Zhang
- College of Life Science, Hebei Normal University, Shijiazhuang, Hebei, 050024, China
| | - Dongping Lu
- Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei, 050021, China.
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13
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Meyer AJ, Dreyer A, Ugalde JM, Feitosa-Araujo E, Dietz KJ, Schwarzländer M. Shifting paradigms and novel players in Cys-based redox regulation and ROS signaling in plants - and where to go next. Biol Chem 2020; 402:399-423. [PMID: 33544501 DOI: 10.1515/hsz-2020-0291] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 11/09/2020] [Indexed: 02/06/2023]
Abstract
Cys-based redox regulation was long regarded a major adjustment mechanism of photosynthesis and metabolism in plants, but in the recent years, its scope has broadened to most fundamental processes of plant life. Drivers of the recent surge in new insights into plant redox regulation have been the availability of the genome-scale information combined with technological advances such as quantitative redox proteomics and in vivo biosensing. Several unexpected findings have started to shift paradigms of redox regulation. Here, we elaborate on a selection of recent advancements, and pinpoint emerging areas and questions of redox biology in plants. We highlight the significance of (1) proactive H2O2 generation, (2) the chloroplast as a unique redox site, (3) specificity in thioredoxin complexity, (4) how to oxidize redox switches, (5) governance principles of the redox network, (6) glutathione peroxidase-like proteins, (7) ferroptosis, (8) oxidative protein folding in the ER for phytohormonal regulation, (9) the apoplast as an unchartered redox frontier, (10) redox regulation of respiration, (11) redox transitions in seed germination and (12) the mitochondria as potential new players in reductive stress safeguarding. Our emerging understanding in plants may serve as a blueprint to scrutinize principles of reactive oxygen and Cys-based redox regulation across organisms.
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Affiliation(s)
- Andreas J Meyer
- Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Friedrich-Ebert-Allee 144, D-53113Bonn, Germany
| | - Anna Dreyer
- Biochemistry and Physiology of Plants, Faculty of Biology, W5-134, Bielefeld University, University Street 25, D-33501Bielefeld, Germany
| | - José M Ugalde
- Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Friedrich-Ebert-Allee 144, D-53113Bonn, Germany
| | - Elias Feitosa-Araujo
- Plant Energy Biology, Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossplatz 8, D-48143Münster, Germany
| | - Karl-Josef Dietz
- Biochemistry and Physiology of Plants, Faculty of Biology, W5-134, Bielefeld University, University Street 25, D-33501Bielefeld, Germany
| | - Markus Schwarzländer
- Plant Energy Biology, Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossplatz 8, D-48143Münster, Germany
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Li Y, Zhao P, Gong T, Wang H, Jiang X, Cheng H, Liu Y, Wu Y, Bu W. Redox Dyshomeostasis Strategy for Hypoxic Tumor Therapy Based on DNAzyme‐Loaded Electrophilic ZIFs. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003653] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Yanli Li
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 P. R. China
| | - Peiran Zhao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 P. R. China
| | - Teng Gong
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 P. R. China
- Center for Interventional Medicine, Guangdong Provincial Key Laboratory of Biomedical Imaging Guangdong Provincial Engineering Research Center of Molecular Imaging The Fifth Affiliated Hospital Sun Yat-sen University Zhuhai Guangdong 519000 P. R. China
| | - Han Wang
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 P. R. China
| | - Xingwu Jiang
- Tongji University Cancer Center, Shanghai Tenth People's Hospital Tongji University School of Medicine Shanghai 200072 P. R. China
| | - Hui Cheng
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 P. R. China
| | - Yanyan Liu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 P. R. China
| | - Yelin Wu
- Tongji University Cancer Center, Shanghai Tenth People's Hospital Tongji University School of Medicine Shanghai 200072 P. R. China
| | - Wenbo Bu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 P. R. China
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 P. R. China
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Li Y, Zhao P, Gong T, Wang H, Jiang X, Cheng H, Liu Y, Wu Y, Bu W. Redox Dyshomeostasis Strategy for Hypoxic Tumor Therapy Based on DNAzyme-Loaded Electrophilic ZIFs. Angew Chem Int Ed Engl 2020; 59:22537-22543. [PMID: 32856362 DOI: 10.1002/anie.202003653] [Citation(s) in RCA: 113] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 07/27/2020] [Indexed: 12/30/2022]
Abstract
Redox homeostasis is one of the main reasons for reactive oxygen species (ROS) tolerance in hypoxic tumors, limiting ROS-mediated tumor therapy. Proposed herein is a redox dyshomeostasis (RDH) strategy based on a nanoplatform, FeCysPW@ZIF-82@CAT Dz, to disrupt redox homeostasis, and its application to improve ROS-mediated hypoxic tumor therapy. Once endocytosed by tumor cells, the catalase DNAzyme (CAT Dz) loaded zeolitic imidazole framework-82 (ZIF-82@CAT Dz) shell can be degraded into Zn2+ as cofactors for CAT Dz mediated CAT silencing and electrophilic ligands for glutathione (GSH) depletion under hypoxia, both of which lead to intracellular RDH and H2 O2 accumulation. These "disordered" cells show reduced resistance to ROS and are effectively killed by ferrous cysteine-phosphotungstate (FeCysPW) induced chemodynamic therapy (CDT). In vitro and in vivo data demonstrate that the pH/hypoxia/H2 O2 triple stimuli responsive nanocomposite can efficiently kill hypoxic tumors. Overall, the RDH strategy provides a new way of thinking about ROS-mediated treatment of hypoxic tumors.
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Affiliation(s)
- Yanli Li
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P. R. China
| | - Peiran Zhao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P. R. China
| | - Teng Gong
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P. R. China.,Center for Interventional Medicine, Guangdong Provincial Key Laboratory of Biomedical Imaging, Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong, 519000, P. R. China
| | - Han Wang
- State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
| | - Xingwu Jiang
- Tongji University Cancer Center, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, 200072, P. R. China
| | - Hui Cheng
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P. R. China
| | - Yanyan Liu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P. R. China
| | - Yelin Wu
- Tongji University Cancer Center, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, 200072, P. R. China
| | - Wenbo Bu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P. R. China.,State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
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Matsusaki M, Okuda A, Matsuo K, Gekko K, Masuda T, Naruo Y, Hirose A, Kono K, Tsuchi Y, Urade R. Regulation of plant ER oxidoreductin 1 (ERO1) activity for efficient oxidative protein folding. J Biol Chem 2019; 294:18820-18835. [PMID: 31685660 DOI: 10.1074/jbc.ra119.010917] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 10/27/2019] [Indexed: 12/14/2022] Open
Abstract
In the endoplasmic reticulum (ER), ER oxidoreductin 1 (ERO1) catalyzes intramolecular disulfide-bond formation within its substrates in coordination with protein-disulfide isomerase (PDI) and related enzymes. However, the molecular mechanisms that regulate the ERO1-PDI system in plants are unknown. Reduction of the regulatory disulfide bonds of the ERO1 from soybean, GmERO1a, is catalyzed by enzymes in five classes of PDI family proteins. Here, using recombinant proteins, vacuum-ultraviolet circular dichroism spectroscopy, biochemical and protein refolding assays, and quantitative immunoblotting, we found that GmERO1a activity is regulated by reduction of intramolecular disulfide bonds involving Cys-121 and Cys-146, which are located in a disordered region, similarly to their locations in human ERO1. Moreover, a GmERO1a variant in which Cys-121 and Cys-146 were replaced with Ala residues exhibited hyperactive oxidation. Soybean PDI family proteins differed in their ability to regulate GmERO1a. Unlike yeast and human ERO1s, for which PDI is the preferred substrate, GmERO1a directly transferred disulfide bonds to the specific active center of members of five classes of PDI family proteins. Of these proteins, GmPDIS-1, GmPDIS-2, GmPDIM, and GmPDIL7 (which are group II PDI family proteins) failed to catalyze effective oxidative folding of substrate RNase A when there was an unregulated supply of disulfide bonds from the C121A/C146A hyperactive mutant GmERO1a, because of its low disulfide-bond isomerization activity. We conclude that regulation of plant ERO1 activity is particularly important for effective oxidative protein folding by group II PDI family proteins.
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Affiliation(s)
- Motonori Matsusaki
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Aya Okuda
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Koichi Matsuo
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama, Higashi-hiroshima, Hiroshima 739-0046, Japan
| | - Kunihiko Gekko
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama, Higashi-hiroshima, Hiroshima 739-0046, Japan
| | - Taro Masuda
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Yurika Naruo
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Akiho Hirose
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Keiichi Kono
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Yuichiro Tsuchi
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Reiko Urade
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan.
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Fan F, Zhang Y, Huang G, Zhang Q, Wang CC, Wang L, Lu D. AtERO1 and AtERO2 Exhibit Differences in Catalyzing Oxidative Protein Folding in the Endoplasmic Reticulum. PLANT PHYSIOLOGY 2019; 180:2022-2033. [PMID: 31138621 PMCID: PMC6670081 DOI: 10.1104/pp.19.00020] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 05/16/2019] [Indexed: 05/26/2023]
Abstract
Disulfide bonds are essential for the folding of the eukaryotic secretory and membrane proteins in the endoplasmic reticulum (ER), and ER oxidoreductin-1 (Ero1) and its homologs are the major disulfide donors that supply oxidizing equivalents in the ER. Although Ero1 homologs in yeast (Saccharomyces cerevisiae) and mammals have been extensively studied, the mechanisms of plant Ero1 functions are far less understood. Here, we found that both Arabidopsis (Arabidopsis thaliana) ERO1 and its homolog AtERO2 are required for oxidative protein folding in the ER. The outer active site, the inner active site, and a long-range noncatalytic disulfide bond are required for AtERO1's function. Interestingly, AtERO1 and AtERO2 also exhibit significant differences. The ero1 plants are more sensitive to reductive stress than the ero2 plants. In vivo, both AtERO1 and AtERO2 have two distinct oxidized isoforms (Ox1 and Ox2), which are determined by the formation or breakage of the putative regulatory disulfide. AtERO1 is mainly present in the Ox1 redox state, while more AtERO2 exists in the Ox2 state. Furthermore, AtERO1 showed much stronger oxidative protein-folding activity than AtERO2 in vitro. Taken together, both AtERO1 and AtERO2 are required to regulate efficient and faithful oxidative protein folding in the ER, but AtERO1 may serves as the primary sulfhydryl oxidase relative to AtERO2.
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Affiliation(s)
- Fenggui Fan
- State Key Laboratory of Plant Genomics, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei 050021, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Yini Zhang
- University of the Chinese Academy of Sciences, Beijing 100049, China
- National Laboratory of Biomacromolecules, Chinese Academy of Sciences Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Guozhong Huang
- State Key Laboratory of Plant Genomics, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei 050021, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Qiao Zhang
- State Key Laboratory of Plant Genomics, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei 050021, China
- Hebei Key Laboratory of Molecular and Cellular Biology, College of Life Science, Hebei Normal University, Shijiazhuang, Hebei 050024, China
| | - Chih-Chen Wang
- University of the Chinese Academy of Sciences, Beijing 100049, China
- National Laboratory of Biomacromolecules, Chinese Academy of Sciences Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Lei Wang
- University of the Chinese Academy of Sciences, Beijing 100049, China
- National Laboratory of Biomacromolecules, Chinese Academy of Sciences Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Dongping Lu
- State Key Laboratory of Plant Genomics, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei 050021, China
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Abstract
ABSTRACT
For most of the proteins synthesized in the endoplasmic reticulum (ER), disulfide bond formation accompanies protein folding in a process called oxidative folding. Oxidative folding is catalyzed by a number of enzymes, including the family of protein disulfide isomerases (PDIs), as well as other proteins that supply oxidizing equivalents to PDI family proteins, like ER oxidoreductin 1 (Ero1). Oxidative protein folding in the ER is a basic vital function, and understanding its molecular mechanism is critical for the application of plants as protein production tools. Here, I review the recent research and progress related to the enzymes involved in oxidative folding in the plant ER. Firstly, nine groups of plant PDI family proteins are introduced. Next, the enzymatic properties of plant Ero1 are described. Finally, the cooperative folding by multiple PDI family proteins and Ero1 is described.
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Affiliation(s)
- Reiko Urade
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka, Japan
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19
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Wada H, Hatakeyama Y, Onda Y, Nonami H, Nakashima T, Erra-Balsells R, Morita S, Hiraoka K, Tanaka F, Nakano H. Multiple strategies for heat adaptation to prevent chalkiness in the rice endosperm. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:1299-1311. [PMID: 30508115 PMCID: PMC6382329 DOI: 10.1093/jxb/ery427] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Accepted: 11/27/2018] [Indexed: 05/03/2023]
Abstract
Heat-induced chalkiness of rice grains is a major concern for rice production, particularly with respect to climate change. Although the formation of chalkiness in the endosperm is suppressed by nitrogen, little is known about the cell-specific dynamics of this process. Here, using picolitre pressure-probe electrospray-ionization mass spectrometry together with transmission electron microscopy and turgor measurements, we examine heat-induced chalkiness in single endosperm cells of intact rice seeds produced under controlled environmental conditions. Exposure to heat stress decreased turgor pressure and increased the cytosolic accumulation of sugars, glutathione, and amino acids, particularly cysteine. Heat stress also led to a significant enlargement of the protein storage vacuoles but with little accumulation of storage proteins. Crucially, this heat-induced partial arrest of amyloplast development led to formation of chalkiness. Whilst increased nitrogen availability also resulted in increased accumulation of amino acids, there was no decrease in turgor pressure. The heat-induced accumulation of cysteine and glutathione was much less marked in the presence of nitrogen, and storage proteins were produced without chalkiness. These data provide important information on the cell dynamics of heat acclimation that underpin the formation of chalkiness in the rice endosperm. We conclude that rice seeds employ multiple strategies to mitigate the adverse effects of heat stress in a manner that is dependent on nitrogen availability, and that the regulation of protein synthesis may play a crucial role in optimizing organelle compartmentation during heat adaption.
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Affiliation(s)
- Hiroshi Wada
- Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Chikugo, Fukuoka, Japan
- Correspondence:
| | - Yuto Hatakeyama
- Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Chikugo, Fukuoka, Japan
| | - Yayoi Onda
- Graduate School of Agriculture, Ehime University, Matsuyama, Ehime, Japan
| | - Hiroshi Nonami
- Graduate School of Agriculture, Ehime University, Matsuyama, Ehime, Japan
| | - Taiken Nakashima
- Faculty of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Rosa Erra-Balsells
- Department of Organic Chemistry, University of Buenos Aires, Buenos Aires, Argentina
| | - Satoshi Morita
- Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Chikugo, Fukuoka, Japan
| | - Kenzo Hiraoka
- Clean Energy Research Center, The University of Yamanashi, Kofu, Yamanashi, Japan
| | - Fukuyo Tanaka
- Central Region Agricultural Research Center, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan
| | - Hiroshi Nakano
- Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Chikugo, Fukuoka, Japan
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Thomas R, Kermode AR. Enzyme enhancement therapeutics for lysosomal storage diseases: Current status and perspective. Mol Genet Metab 2019; 126:83-97. [PMID: 30528228 DOI: 10.1016/j.ymgme.2018.11.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 11/20/2018] [Accepted: 11/21/2018] [Indexed: 01/28/2023]
Abstract
Small-molecule- enzyme enhancement therapeutics (EETs) have emerged as attractive agents for the treatment of lysosomal storage diseases (LSDs), a broad group of genetic diseases caused by mutations in genes encoding lysosomal enzymes, or proteins required for lysosomal function. The underlying enzyme deficiencies characterizing LSDs cause a block in the stepwise degradation of complex macromolecules (e.g. glycosaminoglycans, glycolipids and others), such that undegraded or partially degraded substrates progressively accumulate in lysosomal and non-lysosomal compartments, a process leading to multisystem pathology via primary and secondary mechanisms. Missense mutations underlie many of the LSDs; the resultant mutant variant enzyme hydrolase is often impaired in its folding and maturation making it subject to rapid disposal by endoplasmic reticulum (ER)-associated degradation (ERAD). Enzyme deficiency in the lysosome is the result, even though the mutant enzyme may retain significant catalytic functioning. Small molecule modulators - pharmacological chaperones (PCs), or proteostasis regulators (PRs) are being identified through library screens and computational tools, as they may offer a less costly approach than enzyme replacement therapy (ERT) for LSDs, and potentially treat neuronal forms of the diseases. PCs, capable of directly stabilizing the mutant protein, and PRs, which act on other cellular elements to enhance protein maturation, both allow a proportion of the synthesized variant protein to reach the lysosome and function. Proof-of-principle for PCs and PRs as therapeutic agents has been demonstrated for several LSDs, yet definitive data of their efficacy in disease models and/or in downstream clinical studies in many cases has yet to be achieved. Basic research to understand the cellular consequences of protein misfolding such as perturbed organellar crosstalk, redox status, and calcium balance is needed. Likewise, an elucidation of the early in cellulo pathogenic events underlying LSDs is vital and may lead to the discovery of new small molecule modulators and/or to other therapeutic approaches for driving proteostasis toward protein rescue.
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Affiliation(s)
- Ryan Thomas
- Department of Biological Sciences, Simon Fraser University, 8888 University Dr., Burnaby B.C. V5A 1S6, Canada
| | - Allison R Kermode
- Department of Biological Sciences, Simon Fraser University, 8888 University Dr., Burnaby B.C. V5A 1S6, Canada.
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Meyer AJ, Riemer J, Rouhier N. Oxidative protein folding: state-of-the-art and current avenues of research in plants. THE NEW PHYTOLOGIST 2019; 221:1230-1246. [PMID: 30230547 DOI: 10.1111/nph.15436] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Accepted: 08/01/2018] [Indexed: 06/08/2023]
Abstract
Contents Summary 1230 I. Introduction 1230 II. Formation and isomerization of disulfides in the ER and the Golgi apparatus 1231 III. The disulfide relay in the mitochondrial intermembrane space: why are plants different? 1236 IV. Disulfide bond formation on luminal proteins in thylakoids 1240 V. Conclusion 1242 Acknowledgements 1242 References 1242 SUMMARY: Disulfide bonds are post-translational modifications crucial for the structure and function of thousands of proteins. Their formation and isomerization, referred to as oxidative folding, require specific protein machineries found in oxidizing subcellular compartments, namely the endoplasmic reticulum and the associated endomembrane system, the intermembrane space of mitochondria and the thylakoid lumen of chloroplasts. At least one protein component is required for transferring electrons from substrate proteins to an acceptor that is usually molecular oxygen. For oxidation reactions, incoming reduced substrates are oxidized by thiol-oxidoreductase proteins (or domains in case of chimeric proteins), which are usually themselves oxidized by a single thiol oxidase, the enzyme generating disulfide bonds de novo. By contrast, the description of the molecular actors and pathways involved in proofreading and isomerization of misfolded proteins, which require a tightly controlled redox balance, lags behind. Herein we provide a general overview of the knowledge acquired on the systems responsible for oxidative protein folding in photosynthetic organisms, highlighting their particularities compared to other eukaryotes. Current research challenges are discussed including the importance and specificity of these oxidation systems in the context of the existence of reducing systems in the same compartments.
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Affiliation(s)
- Andreas J Meyer
- INRES-Chemical Signalling, University of Bonn, 53113, Bonn, Germany
| | - Jan Riemer
- Institute of Biochemistry, University of Cologne, 50674, Cologne, Germany
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Hatakeyama Y, Masumoto-Kubo C, Nonami H, Morita S, Hiraoka K, Onda Y, Nakashima T, Nakano H, Wada H. Evidence for preservation of vacuolar compartments during foehn-induced chalky ring formation of Oryza sativa L. PLANTA 2018; 248:1263-1275. [PMID: 30099651 PMCID: PMC6182326 DOI: 10.1007/s00425-018-2975-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Accepted: 08/04/2018] [Indexed: 05/05/2023]
Abstract
Vacuolar compartments being sustained among the amyloplasts inadequately accumulated in rice endosperm cells are the main cause of chalky ring formation under dry wind conditions. Foehn-induced dry wind during the grain-filling stage induces shoot water deficit in rice (Oryza sativa L.) plants, which form a ring-shaped chalkiness in their endosperm that degrades milling quality and rice appearance. Air spaces formed in several inner cells cause significant transparency loss due to irregular light reflection. Although starch synthesis was suggested to be retarded by osmotic adjustment at foehn-induced moderately low water potential, the source of these air spaces remains unknown. We hypothesised that the preservation of vacuoles accompanied by a temporary reduction in starch biosynthesis in the inner cells leads to the chalky ring formation. Panicle water status measurement, light and transmission electron microscopic (TEM) observations, and an absolute qPCR analysis were conducted. Most starch synthesis-related genes exhibited temporarily reduced expression in the inner zone in accordance with the decrease in panicle water status. TEM observations provided evidence that vacuolar compartments remained among the loosely packed starch granules in the inner endosperm cells, where a chalky ring appeared after kernel dehydration. Taken together, we propose that vacuolar compartments sustained among the amyloplasts inadequately accumulated in rice endosperm cells and caused air space formation that leads to ring-shaped chalkiness under dry wind conditions.
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Affiliation(s)
- Yuto Hatakeyama
- Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Chikugo, 833-0041, Japan
| | - Chisato Masumoto-Kubo
- Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Chikugo, 833-0041, Japan
| | - Hiroshi Nonami
- Graduate School of Agriculture, Ehime University, Matsuyama, 790-8566, Japan
| | - Satoshi Morita
- Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Chikugo, 833-0041, Japan
| | - Kenzo Hiraoka
- Clean Energy Research Center, The University of Yamanashi, Kofu, 400-8511, Japan
| | - Yayoi Onda
- Graduate School of Agriculture, Ehime University, Matsuyama, 790-8566, Japan
| | - Taiken Nakashima
- Research Faculty of Agriculture, Hokkaido University, Sapporo, 060-8589, Japan
| | - Hiroshi Nakano
- Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Chikugo, 833-0041, Japan
| | - Hiroshi Wada
- Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Chikugo, 833-0041, Japan.
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23
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Tian L, Xing Y, Fukuda M, Li R, Kumamaru T, Qian D, Dong X, Qu LQ. A conserved motif is essential for the correct assembly of proglutelins and for their export from the endoplasmic reticulum in rice endosperm. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:5029-5043. [PMID: 30107432 PMCID: PMC6184509 DOI: 10.1093/jxb/ery290] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 07/27/2018] [Indexed: 05/13/2023]
Abstract
Rice glutelins are initially synthesized as 57-kDa precursors at the endoplasmic reticulum (ER) and are ultimately transported into protein storage vacuoles. However, the sequence motifs that affect proglutelin folding, assembly, and their export from the ER remain poorly defined. In this study, we characterized a mutant with nine amino acids deleted in the GluA2 protein, which resulted in specific accumulation of the GluA precursor. The deleted amino acids constitute a well-conserved sequence (LVYIIQGRG) in glutelins and all residues in this motif are necessary for ER export of GluA2. Immunoelectron microscopy and stable transgenic analyses indicated that proglutelins with deletion of this motif misassembled and aggregated through non-native intermolecular disulfide bonds, and were deposited in ER-derived protein bodies (PB-Is), resulting in conversion of PB-Is into a new type of PB. These results indicate that the conserved motif is essential for proper assembly of proglutelin. The correct assembly of proglutelins is critical for their segregation from prolamins in the ER lumen, which is essential for enabling the export of proglutelin from the ER and for the proper formation of PB-Is. We also found that the interchain disulfide bond between acidic and basic subunits is not necessary for their assembly, but it is required for proglutelin folding.
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Affiliation(s)
- Lihong Tian
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing, China
| | - Yanping Xing
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing, China
| | - Masako Fukuda
- Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - Rong Li
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing, China
| | | | - Dandan Qian
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing, China
| | - Xiangbai Dong
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing, China
| | - Le Qing Qu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing, China
- Correspondence:
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24
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Ozgur R, Uzilday B, Iwata Y, Koizumi N, Turkan I. Interplay between the unfolded protein response and reactive oxygen species: a dynamic duo. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:3333-3345. [PMID: 29415271 DOI: 10.1093/jxb/ery040] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 01/26/2018] [Indexed: 05/20/2023]
Abstract
Secretory proteins undergo modifications such as glycosylation and disulphide bond formation before proper folding, and move to their final destination via the endomembrane system. Accumulation of unfolded proteins in the endoplasmic reticulum (ER) due to suboptimal environmental conditions triggers a response called the unfolded protein response (UPR), which induces a set of genes that elevate protein folding capacity in the ER. This review aims to establish a connection among ER stress, UPR, and reactive oxygen species (ROS), which remains an unexplored topic in plants. For this, we focused on mechanisms of ROS production originating from ER stress, the interaction between ER stress and overall ROS signalling process in the cell, and the interaction of ER stress with other organellar ROS signalling pathways such as of the mitochondria and chloroplasts. The roles of the UPR during plant hormone signalling and abiotic and biotic stress responses are also discussed in connection with redox and ROS signalling.
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Affiliation(s)
- Rengin Ozgur
- Ege University, Faculty of Science, Department of Biology, Izmir, Turkey
| | - Baris Uzilday
- Ege University, Faculty of Science, Department of Biology, Izmir, Turkey
| | - Yuji Iwata
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Gakuen-cho, Naka-ku, Sakai Osaka, Japan
| | - Nozomu Koizumi
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Gakuen-cho, Naka-ku, Sakai Osaka, Japan
| | - Ismail Turkan
- Ege University, Faculty of Science, Department of Biology, Izmir, Turkey
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25
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Liu G, Wang J, Hou Y, Huang YB, Wang J, Li C, Guo S, Li L, Hu SQ. Characterization of wheat endoplasmic reticulum oxidoreductin 1 and its application in Chinese steamed bread. Food Chem 2018; 256:31-39. [PMID: 29606453 DOI: 10.1016/j.foodchem.2018.02.080] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2017] [Revised: 02/04/2018] [Accepted: 02/14/2018] [Indexed: 11/15/2022]
Abstract
This study investigated characteristics of recombinant wheat Endoplasmic Reticulum Oxidoreductin 1 (wEro1) and its influence on Chinese steamed bread (CSB) qualities. The purified wEro1 monomer, which contained two conserved redox active motif sites, bound to flavin adenine dinucleotide (FAD) cofactor with a molecular weight of ∼47 kDa. wEro1 catalyzed the reduction of both bound and free FAD, and its reduction activity of free FAD reached 7.8 U/mg. Moreover, wEro1 catalyzed the oxidation of dithiothreitol and wheat protein disulfide isomerase (wPDI). Both glutathione and the reduced ribonuclease could work as electron donors for wEro1 in catalyzing the oxidation of wPDI. Additionally, wEro1 supplementation improved the CSB qualities with an increased specific volume of CSB and decreased crumb hardness, which was attributed to water-insoluble wheat proteins increasing and gluten network strengthening. The results give an understanding of the properties and function of wEro1 to facilitate its application especially in the flour-processing industry.
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Affiliation(s)
- Guang Liu
- School of Food Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China; Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences, Key Laboratory of Functional Foods, Ministry of Agriculture, Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China
| | - JingJing Wang
- School of Food Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China
| | - Yi Hou
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - Yan-Bo Huang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - JiaJia Wang
- School of Food Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China
| | - Cunzhi Li
- Department of Food Science and Engineering, Jinan University, Guangzhou 510632, Guangdong, China
| | - ShiJun Guo
- Guangzhou Panyu Polytechnic, Guangzhou 511483, China
| | - Lin Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China
| | - Song-Qing Hu
- School of Food Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China; Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou, China.
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26
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Jurkiewicz P, Batoko H. Protein degradation mechanisms modulate abscisic acid signaling and responses during abiotic stress. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2018; 267:48-54. [PMID: 29362098 DOI: 10.1016/j.plantsci.2017.10.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 10/24/2017] [Accepted: 10/26/2017] [Indexed: 05/20/2023]
Abstract
Abiotic stresses such as salinity, drought, high temperature or freezing can be perceived, in part, as a transient or permanent hyperosmotic stress by the plant cell. As sessile organisms, the detrimental effects of these environmental insults limit plants productivity but also their geographical distribution. Sensing and signaling events that detect the hyperosmotic (or simply osmotic) stress involve the cellular increase of active abscisic acid (ABA). The stress phytohormone ABA regulates fundamental growth and developmental processes in the plant by marshalling metabolic and gene-expression reprogramming. Among the ABA-responsive genes, some are strictly ABA-dependent in that their expression is almost undetectable in absence of elevated levels of cellular ABA, thus their physiological role may be required only transiently. In addition, ABA-dependent modulation of some of the signaling effectors can be irreversible. In this review, without any pretention to being exhaustive, we use specific examples to illustrate how mechanistically conserved eukaryotic cell proteolytic pathways affect ABA-dependent signaling. We describe how defined proteolysis mechanisms in the plant cell, including Regulated Intramembrane Proteolysis (RIP), the Ubiquitin 26S Proteasomal System (UPS), the endocytic and autophagy pathways, contribute to regulate the spatiotemporal level and activity of PP2Cs (protein phosphatases 2C), and how an intriguing ABA-induced protein, the plant Translocator protein (TSPO), is targeted for degradation. Degradation of regulatory or effector molecules modulates or desensitizes ABA-dependent signaling and reestablishes cellular homeostasis.
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Affiliation(s)
- Pawel Jurkiewicz
- Institut des Sciences de la Vie (ISV), Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Henri Batoko
- Institut des Sciences de la Vie (ISV), Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium.
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27
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Abstract
The cereal endosperm is a complex structure comprising distinct cell types, characterized by specialized organelles for the accumulation of storage proteins. Protein trafficking in these cells is complicated by the presence of several different storage organelles including protein bodies (PBs) derived from the endoplasmic reticulum (ER) and dynamic protein storage vacuoles (PSVs). In addition, trafficking may follow a number of different routes depending on developmental stage, showing that the endomembrane system is capable of massive reorganization. Thus, developmental sequences involve progressive changes of the endomembrane system of endosperm tissue and are characterized by a high structural plasticity and endosomal activity.Given the technical dexterity required to access endosperm tissue and study subcellular structures and (seed storage protein) SSP trafficking in cereal seeds, static images are the state of the art providing a bulk of information concerning the cellular composition of seed tissue. In view of the highly dynamic endomembrane system in cereal endosperm cells, it is reasonable to expect that live cell imaging will help to characterize the spatial and temporal changes of the system. The high resolution achieved with electron microscopy perfectly complements the live cell imaging.We therefore established an imaging platform for TEM as well as for live cell imaging. Here, we describe the preparation of different cereal seed tissues for live cell imaging concomitant with immunolocalization studies and ultrastructure.
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28
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Roustan V, Roustan PJ, Weidinger M, Reipert S, Kapusi E, Shabrangy A, Stoger E, Weckwerth W, Ibl V. Microscopic and Proteomic Analysis of Dissected Developing Barley Endosperm Layers Reveals the Starchy Endosperm as Prominent Storage Tissue for ER-Derived Hordeins Alongside the Accumulation of Barley Protein Disulfide Isomerase (HvPDIL1-1). FRONTIERS IN PLANT SCIENCE 2018; 9:1248. [PMID: 30250475 PMCID: PMC6139375 DOI: 10.3389/fpls.2018.01248] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 08/06/2018] [Indexed: 05/20/2023]
Abstract
Barley (Hordeum vulgare) is one of the major food sources for humans and forage sources for animal livestock. The average grain protein content (GPC) of barley ranges between 8 and 12%. Barley hordeins (i.e., prolamins) account for more than 50% of GPC in mature seeds and are important for both grain and flour quality. Barley endosperm is structured into three distinct cell layers: the starchy endosperm, which acts essentially as storage tissue for starch; the subaleurone, which is characterized by a high accumulation of seed storage proteins (SSPs); and the aleurone, which has a prominent role during seed germination. Prolamins accumulate in distinct, ER-derived protein bodies (PBs) and their trafficking route is spatio-temporally regulated. The protein disulfide isomerase (PDI) has been shown to be involved in PB formation. Here, we unravel the spatio-temporal proteome regulation in barley aleurone, subaleurone, and starchy endosperm for the optimization of end-product quality in barley. We used laser microdissection (LMD) for subsequent nanoLC-MS/MS proteomic analyses in two experiments: in Experiment One, we investigated the proteomes of dissected barley endosperm layers at 12 and at ≥20 days after pollination (DAP). We found a set of 10 proteins that were present in all tissues at both time points. Among these proteins, the relative protein abundance of D-hordein, B3-hordein and HvPDIL1-1 significantly increased in starchy endosperm between 12 and ≥20 DAP, identifying the starchy endosperm as putative major storage tissue. In Experiment Two, we specifically compared the starchy endosperm proteome at 6, 12, and ≥20 DAP. Whereas the relative protein abundance of D-hordein and B3-hordein increased between 6 and ≥20 DAP, HvPDIL1-1 increased between 6 and 12 DAP, but remained constant at ≥20 DAP. Microscopic observations showed that these relative protein abundance alterations were accompanied by additional localization of hordeins at the periphery of starch granules and a partial re-localization of HvPDIL1-1 from PBs to the periphery of starch granules. Our data indicate a spatio-temporal regulation of hordeins and HvPDIL1-1. These results are discussed in relation to the putative role of HvPDIL1-1 in end-product quality in barley.
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Affiliation(s)
- Valentin Roustan
- Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria
| | - Pierre-Jean Roustan
- Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria
| | | | - Siegfried Reipert
- Cell Imaging and Ultrastructure Research, University of Vienna, Vienna, Austria
| | - Eszter Kapusi
- Department for Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Azita Shabrangy
- Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria
| | - Eva Stoger
- Department for Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Wolfram Weckwerth
- Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria
- Vienna Metabolomics Center, University of Vienna, Vienna, Austria
| | - Verena Ibl
- Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria
- *Correspondence: Verena Ibl
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29
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Selles B, Zannini F, Couturier J, Jacquot JP, Rouhier N. Atypical protein disulfide isomerases (PDI): Comparison of the molecular and catalytic properties of poplar PDI-A and PDI-M with PDI-L1A. PLoS One 2017; 12:e0174753. [PMID: 28362814 PMCID: PMC5375154 DOI: 10.1371/journal.pone.0174753] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 03/14/2017] [Indexed: 11/18/2022] Open
Abstract
Protein disulfide isomerases are overwhelmingly multi-modular redox catalysts able to perform the formation, reduction or isomerisation of disulfide bonds. We present here the biochemical characterization of three different poplar PDI isoforms. PDI-A is characterized by a single catalytic Trx module, the so-called a domain, whereas PDI-L1a and PDI-M display an a-b-b’-a’ and a°-a-b organisation respectively. Their activities have been tested in vitro using purified recombinant proteins and a series of model substrates as insulin, NADPH thioredoxin reductase, NADP malate dehydrogenase (NADP-MDH), peroxiredoxins or RNase A. We demonstrated that PDI-A exhibited none of the usually reported activities, although the cysteines of the WCKHC active site signature are able to form a disulfide with a redox midpoint potential of -170 mV at pH 7.0. The fact that it is able to bind a [Fe2S2] cluster upon Escherichia coli expression and anaerobic purification might indicate that it does not have a function in dithiol-disulfide exchange reactions. The two other proteins were able to catalyze oxidation or reduction reactions, PDI-L1a being more efficient in most cases, except that it was unable to activate the non-physiological substrate NADP-MDH, in contrast to PDI-M. To further evaluate the contribution of the catalytic domains of PDI-M, the dicysteinic motifs have been independently mutated in each a domain. The results indicated that the two a domains seem interconnected and that the a° module preferentially catalyzed oxidation reactions whereas the a module catalyzed reduction reactions, in line with the respective redox potentials of -170 mV and -190 mV at pH 7.0. Overall, these in vitro results illustrate that the number and position of a and b domains influence the redox properties and substrate recognition (both electron donors and acceptors) of PDI which contributes to understand why this protein family expanded along evolution.
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Affiliation(s)
- Benjamin Selles
- UMR 1136 Interactions Arbres/Microorganismes, Université de Lorraine/ INRA, Faculté des Sciences et Technologies, Vandoeuvre-lès-Nancy, France
| | - Flavien Zannini
- UMR 1136 Interactions Arbres/Microorganismes, Université de Lorraine/ INRA, Faculté des Sciences et Technologies, Vandoeuvre-lès-Nancy, France
| | - Jérémy Couturier
- UMR 1136 Interactions Arbres/Microorganismes, Université de Lorraine/ INRA, Faculté des Sciences et Technologies, Vandoeuvre-lès-Nancy, France
| | - Jean-Pierre Jacquot
- UMR 1136 Interactions Arbres/Microorganismes, Université de Lorraine/ INRA, Faculté des Sciences et Technologies, Vandoeuvre-lès-Nancy, France
| | - Nicolas Rouhier
- UMR 1136 Interactions Arbres/Microorganismes, Université de Lorraine/ INRA, Faculté des Sciences et Technologies, Vandoeuvre-lès-Nancy, France
- * E-mail:
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30
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Okuda A, Matsusaki M, Masuda T, Urade R. Identification and characterization of GmPDIL7, a soybean ER membrane-bound protein disulfide isomerase family protein. FEBS J 2017; 284:414-428. [PMID: 27960051 DOI: 10.1111/febs.13984] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2016] [Revised: 11/04/2016] [Accepted: 12/05/2016] [Indexed: 01/19/2023]
Abstract
Most proteins synthesized in the endoplasmic reticulum (ER) possess intramolecular and intermolecular disulfide bonds, which play an important role in the conformational stability and function of proteins. Hence, eukaryotic cells contain protein disulfide bond formation pathways such as the protein disulfide isomerase (PDI)-ER oxidoreductin 1 (Ero1) system in the ER lumen. In this study, we identified soybean PDIL7 (GmPDIL7), a novel soybean ER membrane-bound PDI family protein, and determined its enzymatic properties. GmPDIL7 has a putative N-terminal signal sequence, a thioredoxin domain with an active center motif (CGHC), and a putative C-terminal transmembrane region. Likewise, we demonstrated that GmPDIL7 is ubiquitously expressed in soybean tissues and is localized in the ER membrane. Furthermore, GmPDIL7 associated with other soybean PDI family proteins in vivo and GmPDIL7 mRNA was slightly upregulated under ER stress. The redox potential of recombinant GmPDIL7 expressed in Escherichia coli was -187 mV, indicating that GmPDIL7 could oxidize unfolded proteins. GmPDIL7 exhibited a dithiol oxidase activity level that was similar to other soybean PDI family proteins. However, the oxidative refolding activity of GmPDIL7 was lower than other soybean PDI family proteins. GmPDIL7 was well oxidized by GmERO1. Taken together, our results indicated that GmPDIL7 primarily plays a role as a supplier of disulfide bonds in nascent proteins for oxidative folding on the ER membrane. DATABASE The nucleotide sequence data for the GmPDIL7 cDNA are available in the DNA Data Bank of Japan (DDBJ) databases under the accession numbers LC158001. ENZYME Protein disulfide isomerase: EC 5.3.4.1.
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Affiliation(s)
- Aya Okuda
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Japan
| | - Motonori Matsusaki
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Japan
| | - Taro Masuda
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Japan
| | - Reiko Urade
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Japan
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31
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Fukuda M, Kawagoe Y, Murakami T, Washida H, Sugino A, Nagamine A, Okita TW, Ogawa M, Kumamaru T. The Dual Roles of the Golgi Transport 1 (GOT1B): RNA Localization to the Cortical Endoplasmic Reticulum and the Export of Proglutelin and α-Globulin from the Cortical ER to the Golgi. PLANT & CELL PHYSIOLOGY 2016; 57:2380-2391. [PMID: 27565205 DOI: 10.1093/pcp/pcw154] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 08/23/2016] [Indexed: 06/06/2023]
Abstract
The rice glup2 lines are characterized by their abnormally high levels of endosperm 57 kDa proglutelins and of the luminal chaperone binding protein (BiP), features characteristic of a defect within the endoplasmic reticulum (ER). To elucidate the underlying genetic basis, the glup2 locus was identified by map based cloning. DNA sequencing of the genomes of three glup2 alleles and wild type demonstrated that the underlying genetic basis was mutations in the Golgi transport 1 (GOT1B) coding sequence. This conclusion was further validated by restoration of normal proglutelin levels in a glup2 line complemented by a GOT1B gene. Microscopic analyses indicated the presence of proglutelin-α-globulin-containing intracisternal granules surrounded by prolamine inclusions within the ER lumen. As assessed by in situ reverse transcriptase polymerase chain reaction (RT-PCR) analysis of developing endosperm sections, prolamine and α-globulin RNAs were found to be mis-targeted from their usual sites on the protein body ER to the cisternal ER, the normal sites of proglutelin synthesis. Our results indicate that GLUP2/GOT1B has a dual role during rice endosperm development. It is required for localization of prolamine and α-globulin RNAs to the protein body ER and for efficient export of proglutelin and α-globulin proteins from the ER to the Golgi apparatus.
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Affiliation(s)
- Masako Fukuda
- Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan
| | - Yasushi Kawagoe
- National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan
- Deceased
| | | | - Haruhiko Washida
- Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164-6340, USA
- Present address: U-TEC Corporation, 648-1 Matsukasa, Yamatokoriyama, Nara 639-1124, Japan
| | - Aya Sugino
- Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164-6340, USA
| | - Ai Nagamine
- Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164-6340, USA
| | - Thomas W Okita
- Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164-6340, USA
| | - Masahiro Ogawa
- Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan
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32
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Wakasa Y, Takaiwa F. Analysis of Recombinant Proteins in Transgenic Rice Seeds: Identity, Localization, Tolerance to Digestion, and Plant Stress Response. Methods Mol Biol 2016; 1385:223-47. [PMID: 26614293 DOI: 10.1007/978-1-4939-3289-4_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Rice seeds are an ideal production platform for high-value recombinant proteins in terms of economy, scalability, safety, and stability. Strategies for the expression of large amounts of recombinant proteins in rice seeds have been established in the past decade and transgenic rice seeds that accumulate recombinant products such as bioactive peptides and proteins, which promote the health and quality of life of humans, have been generated in many laboratories worldwide. One of the most important advantages is the potential for direct oral delivery of transgenic rice seeds without the need for recombinant protein purification (downstream processing), which has been attributed to the high expression levels of recombinant products. Transgenic rice will be beneficial as a delivery system for pharmaceuticals and nutraceuticals in the future. This chapter introduces the strategy for producing recombinant protein in the edible part (endosperm) of the rice grain and describes methods for the analysis of transgenic rice seeds in detail.
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Affiliation(s)
- Yuhya Wakasa
- Functional Transgenic Crops Research Unit, Genetically Modified Organism Research Center, National Institute of Agrobiological Sciences, Kannondai 2-1-2, Tsukuba, Ibaraki, 305-8602, Japan
| | - Fumio Takaiwa
- Functional Transgenic Crops Research Unit, Genetically Modified Organism Research Center, National Institute of Agrobiological Sciences, Kannondai 2-1-2, Tsukuba, Ibaraki, 305-8602, Japan.
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33
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Liu JX, Howell SH. Managing the protein folding demands in the endoplasmic reticulum of plants. THE NEW PHYTOLOGIST 2016; 211:418-28. [PMID: 26990454 DOI: 10.1111/nph.13915] [Citation(s) in RCA: 128] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 01/25/2016] [Indexed: 05/18/2023]
Abstract
Endoplasmic reticulum (ER) stress occurs in plants during certain developmental stages or under adverse environmental conditions, as a result of the accumulation of unfolded or misfolded proteins in the ER. To minimize the accumulation of misfolded proteins in the ER, a protein quality control (PQC) system monitors protein folding and eliminates misfolded proteins through either ER-associated protein degradation (ERAD) or autophagy. ER stress elicits the unfolded protein response (UPR), which enhances the operation in plant cells of the ER protein folding machinery and the PQC system. The UPR also reduces protein folding demands in the ER by degrading mRNAs encoding secretory proteins. In plants subjected to severe or chronic stress, UPR promotes programmed cell death (PCD). Progress in the field in recent years has provided insights into the regulatory networks and signaling mechanisms of the ER stress responses in plants. In addition, novel physiological functions of the ER stress responses in plants for coordinating plant growth and development with changing environment have been recently revealed.
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Affiliation(s)
- Jian-Xiang Liu
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Institute of Plant Biology, School of Life Sciences, Fudan University, Shanghai, 200433, China
| | - Stephen H Howell
- Department of Genetics, Development and Cell Biology, Plant Sciences Institute, Iowa State University, Ames, IA, 50011, USA
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Fragkostefanakis S, Mesihovic A, Hu Y, Schleiff E. Unfolded protein response in pollen development and heat stress tolerance. PLANT REPRODUCTION 2016; 29:81-91. [PMID: 27022919 DOI: 10.1007/s00497-016-0276-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Accepted: 02/10/2016] [Indexed: 05/18/2023]
Abstract
Importance of the UPR for pollen. Pollen is particularly sensitive to environmental conditions that disturb protein homeostasis, such as higher temperatures. Their survival is dependent on subcellular stress response systems, one of which maintains protein homeostasis in the endoplasmic reticulum (ER). Disturbance of ER proteostasis due to stress leads to the activation of the unfolded protein response (UPR) that mitigates stress damage mainly by increasing ER-folding capacity and reducing folding demands. The UPR is controlled by ER membrane-associated transcription factors and an RNA splicing factor. They are important components of abiotic stress responses including general heat stress response and thermotolerance. In addition to responding to environmental stresses, the UPR is implicated in developmental processes required for successful male gametophyte development and fertilization. Consequently, defects in the UPR can lead to pollen abortion and male sterility. Several UPR components are involved in the elaboration of the ER network, which is required for pollen germination and polar tube growth. Transcriptome and proteome analyses have shown that components of the ER-folding machinery and the UPR are upregulated at specific stages of pollen development supporting elevated demands for secretion. Furthermore, genetic studies have revealed that knockout mutants of UPR genes are defective in producing viable or competitive pollen. In this review, we discuss recent findings regarding the importance of the UPR for both pollen development and stress response.
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Affiliation(s)
- Sotirios Fragkostefanakis
- Department of Biosciences, Molecular Cell Biology of Plants, Goethe University, 60438, Frankfurt am Main, Germany.
| | - Anida Mesihovic
- Department of Biosciences, Molecular Cell Biology of Plants, Goethe University, 60438, Frankfurt am Main, Germany
| | - Yangjie Hu
- Department of Biosciences, Molecular Cell Biology of Plants, Goethe University, 60438, Frankfurt am Main, Germany
| | - Enrico Schleiff
- Department of Biosciences, Molecular Cell Biology of Plants, Goethe University, 60438, Frankfurt am Main, Germany.
- Cluster of Excellence Frankfurt, Goethe University, 60438, Frankfurt am Main, Germany.
- Buchmann Institute for Molecular Life Sciences (BMLS), Goethe University, 60438, Frankfurt am Main, Germany.
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Toyosawa Y, Kawagoe Y, Matsushima R, Crofts N, Ogawa M, Fukuda M, Kumamaru T, Okazaki Y, Kusano M, Saito K, Toyooka K, Sato M, Ai Y, Jane JL, Nakamura Y, Fujita N. Deficiency of Starch Synthase IIIa and IVb Alters Starch Granule Morphology from Polyhedral to Spherical in Rice Endosperm. PLANT PHYSIOLOGY 2016; 170:1255-70. [PMID: 26747287 PMCID: PMC4775109 DOI: 10.1104/pp.15.01232] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 01/07/2016] [Indexed: 05/03/2023]
Abstract
Starch granule morphology differs markedly among plant species. However, the mechanisms controlling starch granule morphology have not been elucidated. Rice (Oryza sativa) endosperm produces characteristic compound-type granules containing dozens of polyhedral starch granules within an amyloplast. Some other cereal species produce simple-type granules, in which only one starch granule is present per amyloplast. A double mutant rice deficient in the starch synthase (SS) genes SSIIIa and SSIVb (ss3a ss4b) produced spherical starch granules, whereas the parental single mutants produced polyhedral starch granules similar to the wild type. The ss3a ss4b amyloplasts contained compound-type starch granules during early developmental stages, and spherical granules were separated from each other during subsequent amyloplast development and seed dehydration. Analysis of glucan chain length distribution identified overlapping roles for SSIIIa and SSIVb in amylopectin chain synthesis, with a degree of polymerization of 42 or greater. Confocal fluorescence microscopy and immunoelectron microscopy of wild-type developing rice seeds revealed that the majority of SSIVb was localized between starch granules. Therefore, we propose that SSIIIa and SSIVb have crucial roles in determining starch granule morphology and in maintaining the amyloplast envelope structure. We present a model of spherical starch granule production.
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Affiliation(s)
- Yoshiko Toyosawa
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Yasushi Kawagoe
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Ryo Matsushima
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Naoko Crofts
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Masahiro Ogawa
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Masako Fukuda
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Toshihiro Kumamaru
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Yozo Okazaki
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Miyako Kusano
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Kazuki Saito
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Kiminori Toyooka
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Mayuko Sato
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Yongfeng Ai
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Jay-Lin Jane
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Yasunori Nakamura
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
| | - Naoko Fujita
- Department of Biological Production, Akita Prefectural University, Akita City, Akita 010-0195, Japan (Y.T., N.C., Y.N., N.F.);Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan (Y.K.);Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan (R.M.);Department of General Education, Yamaguchi Prefectural University, Yamaguchi 753-8502, Japan (M.O.);Plant Genetic Resources, Institute of Genetic Resources, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan (M.F., T.K.);RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama 230-0045, Japan (Y.O., M.K., K.S., K.T., M.S.);Graduate School of Pharmaceutical Sciences, Chiba University, Chuo-ku, Chiba 260-8675, Japan (K.S.); andDepartment of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50011-1120 (Y.A., J.-L.J.)
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Matsusaki M, Okuda A, Masuda T, Koishihara K, Mita R, Iwasaki K, Hara K, Naruo Y, Hirose A, Tsuchi Y, Urade R. Cooperative Protein Folding by Two Protein Thiol Disulfide Oxidoreductases and 1 in Soybean. PLANT PHYSIOLOGY 2016; 170:774-89. [PMID: 26645455 PMCID: PMC4734590 DOI: 10.1104/pp.15.01781] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 12/07/2015] [Indexed: 05/13/2023]
Abstract
Most proteins produced in the endoplasmic reticulum (ER) of eukaryotic cells fold via disulfide formation (oxidative folding). Oxidative folding is catalyzed by protein disulfide isomerase (PDI) and PDI-related ER protein thiol disulfide oxidoreductases (ER oxidoreductases). In yeast and mammals, ER oxidoreductin-1s (Ero1s) supply oxidizing equivalent to the active centers of PDI. In this study, we expressed recombinant soybean Ero1 (GmERO1a) and found that GmERO1a oxidized multiple soybean ER oxidoreductases, in contrast to mammalian Ero1s having a high specificity for PDI. One of these ER oxidoreductases, GmPDIM, associated in vivo and in vitro with GmPDIL-2, was unable to be oxidized by GmERO1a. We therefore pursued the possible cooperative oxidative folding by GmPDIM, GmERO1a, and GmPDIL-2 in vitro and found that GmPDIL-2 synergistically accelerated oxidative refolding. In this process, GmERO1a preferentially oxidized the active center in the A': domain among the A: , A': , and B: domains of GmPDIM. A disulfide bond introduced into the active center of the A': domain of GmPDIM was shown to be transferred to the active center of the A: domain of GmPDIM and the A: domain of GmPDIM directly oxidized the active centers of both the A: or A': domain of GmPDIL-2. Therefore, we propose that the relay of an oxidizing equivalent from one ER oxidoreductase to another may play an essential role in cooperative oxidative folding by multiple ER oxidoreductases in plants.
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Affiliation(s)
- Motonori Matsusaki
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Aya Okuda
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Taro Masuda
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Katsunori Koishihara
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Ryuta Mita
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Kensuke Iwasaki
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Kumiko Hara
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Yurika Naruo
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Akiho Hirose
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Yuichiro Tsuchi
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Reiko Urade
- Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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Hilscher J, Kapusi E, Stoger E, Ibl V. Cell layer-specific distribution of transiently expressed barley ESCRT-III component HvVPS60 in developing barley endosperm. PROTOPLASMA 2016; 253:137-53. [PMID: 25796522 PMCID: PMC4712231 DOI: 10.1007/s00709-015-0798-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 03/09/2015] [Indexed: 05/29/2023]
Abstract
The significance of the endosomal sorting complexes required for transport (ESCRT)-III in cereal endosperm has been shown by the identification of the recessive mutant supernumerary aleurone layer1 (SAL1) in maize. ESCRT-III is indispensable in the final membrane fission step during biogenesis of multivesicular bodies (MVBs), responsible for protein sorting to vacuoles and to the cell surface. Here, we annotated barley ESCRT-III members in the (model) crop Hordeum vulgare and show that all identified members are expressed in developing barley endosperm. We used fluorescently tagged core ESCRT-III members HvSNF7a/CHMP4 and HvVPS24/CHMP3 and the associated ESCRT-III component HvVPS60a/CHMP5 for transient localization studies in barley endosperm. In vivo confocal microscopic analyses show that the localization of recombinantly expressed HvSNF7a, HvVPS24 and HvVPS60a differs within barley endosperm. Whereas HvSNF7a induces large agglomerations, HvVPS24 shows mainly cytosolic localization in aleurone and subaleurone. In contrast, HvVPS60a localizes strongly at the plasma membrane in aleurone. In subaleurone, HvVPS60a was found to a lesser extent at the plasma membrane and at vacuolar membranes. These results indicate that the steady-state association of ESCRT-III may be influenced by cell layer-specific protein deposition or trafficking and remodelling of the endomembrane system in endosperm. We show that sorting of an artificially mono-ubiquitinated Arabidopsis plasma membrane protein is inhibited by HvVPS60a in aleurone. The involvement of HvVPS60a in different cell layer-specific trafficking pathways, reflected by localization of HvVPS60a at the plasma membrane in aleurone and at the PSV membrane in subaleurone, is discussed.
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Affiliation(s)
- Julia Hilscher
- Department of Applied Genetics and Cell Biology, Division of Molecular Cell Biology and Glycobiotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190, Vienna, Austria
| | - Eszter Kapusi
- Department of Applied Genetics and Cell Biology, Division of Molecular Cell Biology and Glycobiotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190, Vienna, Austria
| | - Eva Stoger
- Department of Applied Genetics and Cell Biology, Division of Molecular Cell Biology and Glycobiotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190, Vienna, Austria
| | - Verena Ibl
- Department of Applied Genetics and Cell Biology, Division of Molecular Cell Biology and Glycobiotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190, Vienna, Austria.
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Shiraya T, Mori T, Maruyama T, Sasaki M, Takamatsu T, Oikawa K, Itoh K, Kaneko K, Ichikawa H, Mitsui T. Golgi/plastid-type manganese superoxide dismutase involved in heat-stress tolerance during grain filling of rice. PLANT BIOTECHNOLOGY JOURNAL 2015; 13:1251-63. [PMID: 25586098 PMCID: PMC6680209 DOI: 10.1111/pbi.12314] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 11/19/2014] [Indexed: 05/20/2023]
Abstract
Superoxide dismutase (SOD) is widely assumed to play a role in the detoxification of reactive oxygen species caused by environmental stresses. We found a characteristic expression of manganese SOD 1 (MSD1) in a heat-stress-tolerant cultivar of rice (Oryza sativa). The deduced amino acid sequence contains a signal sequence and an N-glycosylation site. Confocal imaging analysis of rice and onion cells transiently expressing MSD1-YFP showed MSD1-YFP in the Golgi apparatus and plastids, indicating that MSD1 is a unique Golgi/plastid-type SOD. To evaluate the involvement of MSD1 in heat-stress tolerance, we generated transgenic rice plants with either constitutive high expression or suppression of MSD1. The grain quality of rice with constitutive high expression of MSD1 grown at 33/28 °C, 12/12 h, was significantly better than that of the wild type. In contrast, MSD1-knock-down rice was markedly susceptible to heat stress. Quantitative shotgun proteomic analysis indicated that the overexpression of MSD1 up-regulated reactive oxygen scavenging, chaperone and quality control systems in rice grains under heat stress. We propose that the Golgi/plastid MSD1 plays an important role in adaptation to heat stress.
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Affiliation(s)
- Takeshi Shiraya
- Department of Applied Biological Chemistry, Niigata University, Niigata, Japan
| | - Taiki Mori
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Tatsuya Maruyama
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Maiko Sasaki
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Takeshi Takamatsu
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Kazusato Oikawa
- Department of Applied Biological Chemistry, Niigata University, Niigata, Japan
| | - Kimiko Itoh
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Kentaro Kaneko
- Department of Applied Biological Chemistry, Niigata University, Niigata, Japan
| | - Hiroaki Ichikawa
- Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba, Japan
| | - Toshiaki Mitsui
- Department of Applied Biological Chemistry, Niigata University, Niigata, Japan
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
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Klinger J, Fischer R, Commandeur U. Comparison of Thermobifida fusca Cellulases Expressed in Escherichia coli and Nicotiana tabacum Indicates Advantages of the Plant System for the Expression of Bacterial Cellulases. FRONTIERS IN PLANT SCIENCE 2015; 6:1047. [PMID: 26648951 PMCID: PMC4664618 DOI: 10.3389/fpls.2015.01047] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 11/09/2015] [Indexed: 06/05/2023]
Abstract
The economic conversion of lignocellulosic biomass to biofuels requires in addition to pretreatment techniques access to large quantities of inexpensive cellulases to be competitive with established first generation processes. A solution to this problem could be achieved by plant based expression of these enzymes. We expressed the complete set of six cellulases and an additional β-glucosidase expressed from Thermobifida fusca in the bacterium Escherichia coli and in tobacco plants (Nicotiana tabacum). This was done to determine whether functional enzyme expression was feasible in these organisms. In extracts of recombinant E. coli cells, five of the proteins were detected by western blot analysis, but exocellulases E3 and E6 were undetectable. In the plant-based expression system we were able to detect all six cellulases but not the β-glucosidase even though activity was detectable. When E. coli was used as the expression system, endocellulase E2 was active, while endocellulases E1 and E5 showed only residual activity. The remaining cellulases appeared completely inactive against the model substrates azo-carboxymethyl-cellulose (Azo-CMC) and 4-methylumbelliferyl-cellobioside (4-MUC). Only the β-glucosidase showed high activity against 4-MUC. In contrast, all the plant-derived enzymes were active against the respective model substrates. Our data indicate that some enzymes of bacterial origin are more active and more efficiently expressed in plants than in a bacterial host.
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Affiliation(s)
- Johannes Klinger
- Institute for Biology VII (Molecular Biotechnology), RWTH Aachen UniversityAachen, Germany
| | - Rainer Fischer
- Institute for Biology VII (Molecular Biotechnology), RWTH Aachen UniversityAachen, Germany
- Fraunhofer Institute for Molecular Biology and Applied EcologyAachen, Germany
| | - Ulrich Commandeur
- Institute for Biology VII (Molecular Biotechnology), RWTH Aachen UniversityAachen, Germany
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Takaiwa F, Wakasa Y, Takagi H, Hiroi T. Rice seed for delivery of vaccines to gut mucosal immune tissues. PLANT BIOTECHNOLOGY JOURNAL 2015; 13:1041-55. [PMID: 26100952 DOI: 10.1111/pbi.12423] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 05/14/2015] [Accepted: 05/23/2015] [Indexed: 05/09/2023]
Abstract
Gut-associated lymphoid tissue (GALT) is the biggest lymphoid organ in the body. It plays a role in robust immune responses against invading pathogens while maintaining immune tolerance against nonpathogenic antigens such as foods. Oral vaccination can induce mucosal and systemic antigen-specific immune reactions and has several advantages including ease of administration, no requirement for purification and ease of scale-up of antigen. Thus far, taking advantage of these properties, various plant-based oral vaccines have been developed. Seeds provide a superior production platform over other plant tissues for oral vaccines; they offer a suitable delivery vehicle to GALT due to their high stability at room temperature, ample and stable deposition space, high expression level, and protection from digestive enzymes in gut. A rice seed production system for oral vaccines was established by combining stable deposition in protein bodies or protein storage vacuoles and enhanced endosperm-specific expression. Various types of rice-based oral vaccines for infectious and allergic diseases were generated. Efficacy of these rice-based vaccines was evaluated in animal models.
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Affiliation(s)
- Fumio Takaiwa
- Functional Crop Research and Development Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, Japan
| | - Yuhya Wakasa
- Functional Crop Research and Development Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, Japan
| | - Hidenori Takagi
- Functional Crop Research and Development Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, Japan
| | - Takachika Hiroi
- Department of Allergy and Immunology, The Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
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Qian D, Tian L, Qu L. Proteomic analysis of endoplasmic reticulum stress responses in rice seeds. Sci Rep 2015; 5:14255. [PMID: 26395408 PMCID: PMC4585792 DOI: 10.1038/srep14255] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 08/21/2015] [Indexed: 01/15/2023] Open
Abstract
The defects in storage proteins secretion in the endosperm of transgenic rice seeds often leads to endoplasmic reticulum (ER) stress, which produces floury and shrunken seeds, but the mechanism of this response remains unclear. We used an iTRAQ-based proteomics analysis of ER-stressed rice seeds due to the endosperm-specific suppression of OsSar1 to identify changes in the protein levels in response to ER stress. ER stress changed the expression of 405 proteins in rice seed by >2.0- fold compared with the wild-type control. Of these proteins, 140 were upregulated and 265 were downregulated. The upregulated proteins were mainly involved in protein modification, transport and degradation, and the downregulated proteins were mainly involved in metabolism and stress/defense responses. A KOBAS analysis revealed that protein-processing in the ER and degradation-related proteasome were the predominant upregulated pathways in the rice endosperm in response to ER stress. Trans-Golgi protein transport was also involved in the ER stress response. Combined with bioinformatic and molecular biology analyses, our proteomic data will facilitate our understanding of the systemic responses to ER stress in rice seeds.
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Affiliation(s)
- Dandan Qian
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
| | - Lihong Tian
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
| | - Leqing Qu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
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Ozgur R, Uzilday B, Sekmen AH, Turkan I. The effects of induced production of reactive oxygen species in organelles on endoplasmic reticulum stress and on the unfolded protein response in arabidopsis. ANNALS OF BOTANY 2015; 116:541-53. [PMID: 26070642 PMCID: PMC4577994 DOI: 10.1093/aob/mcv072] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 02/02/2015] [Accepted: 04/15/2015] [Indexed: 05/20/2023]
Abstract
BACKGROUND AND AIMS Accumulation of unfolded proteins caused by inefficient chaperone activity in the endoplasmic reticulum (ER) is termed 'ER stress', and it is perceived by a complex gene network. Induction of these genes triggers a response termed the 'unfolded protein response' (UPR). If a cell cannot overcome the accumulation of unfolded proteins, the ER-associated degradation (ERAD) system is induced to degrade those proteins. In addition to other factors, reactive oxygen species (ROS) are also produced during oxidative protein-folding in the ER. It has been shown in animal systems that there is a tight association between mitochondrial ROS and ER stress. However, in plants there are no reports concerning how induced ROS production in mitochondria and chloroplasts affects ER stress and if there is a possible role of organelle-originated ROS as a messenger molecule in the unfolded protein response. To address this issue, electron transport in chloroplasts and mitochondria and carnitine acetyl transferase (CAT) activity in peroxisomes were inhibited in wild-type Arabidopsis thaliana to induce ROS production. Expression of UPR genes was then investigated. METHODS Plants of A. thaliana ecotype Col-0 were treated with various H2O2- and ROS-producing agents specific to different organelles, including the mitochondria, chloroplasts and peroxisomes. The expression of ER stress sensor/transducer genes (bZIP28, bZIP17, IRE1A, IRE1B, BiP1, BiP3), genes related to protein folding (CNX, ERO1) and ERAD genes (HRD1, SEL1, DER1, UBC32) were evaluated by qRT-PCR analysis. KEY RESULTS Relatively low concentrations of ROS were more effective for induction of the ER stress response. Mitochondrial and chloroplastic ROS production had different induction mechanisms for the UPR and ER stress responses. CONCLUSIONS Chloroplast- and mitochondria-originated ROS have distinct roles in triggering the ER stress response. In general, low concentrations of ROS induced the transcription of ER stress-related genes, which can be attributed to the roles of ROS as secondary messengers. This is the first time that ROS production in organelles has been shown to affect the ER stress response in a plant system.
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Affiliation(s)
- Rengin Ozgur
- Department of Biology, Faculty of Science, Ege University, Bornova, Izmir, 35100, Turkey
| | - Baris Uzilday
- Department of Biology, Faculty of Science, Ege University, Bornova, Izmir, 35100, Turkey
| | - A Hediye Sekmen
- Department of Biology, Faculty of Science, Ege University, Bornova, Izmir, 35100, Turkey
| | - Ismail Turkan
- Department of Biology, Faculty of Science, Ege University, Bornova, Izmir, 35100, Turkey
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Lack of Globulin Synthesis during Seed Development Alters Accumulation of Seed Storage Proteins in Rice. Int J Mol Sci 2015; 16:14717-36. [PMID: 26133242 PMCID: PMC4519868 DOI: 10.3390/ijms160714717] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 06/18/2015] [Accepted: 06/23/2015] [Indexed: 12/18/2022] Open
Abstract
The major seed storage proteins (SSPs) in rice seeds have been classified into three types, glutelins, prolamins, and globulin, and the proportion of each SSP varies. It has been shown in rice mutants that when either glutelins or prolamins are defective, the expression of another type of SSP is promoted to counterbalance the deficit. However, we observed reduced abundances of glutelins and prolamins in dry seeds of a globulin-deficient rice mutant (Glb-RNAi), which was generated with RNA interference (RNAi)-induced suppression of globulin expression. The expression of the prolamin and glutelin subfamily genes was reduced in the immature seeds of Glb-RNAi lines compared with those in wild type. A proteomic analysis of Glb-RNAi seeds showed that the reductions in glutelin and prolamin were conserved at the protein level. The decreased pattern in glutelin was also significant in the presence of a reductant, suggesting that the polymerization of the glutelin proteins via intramolecular disulfide bonds could be interrupted in Glb-RNAi seeds. We also observed aberrant and loosely packed structures in the storage organelles of Glb-RNAi seeds, which may be attributable to the reductions in SSPs. In this study, we evaluated the role of rice globulin in seed development, showing that a deficiency in globulin could comprehensively reduce the expression of other SSPs.
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Kimura S, Higashino Y, Kitao Y, Masuda T, Urade R. Expression and characterization of protein disulfide isomerase family proteins in bread wheat. BMC PLANT BIOLOGY 2015; 15:73. [PMID: 25849633 PMCID: PMC4355359 DOI: 10.1186/s12870-015-0460-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Accepted: 02/13/2015] [Indexed: 05/09/2023]
Abstract
BACKGROUND The major wheat seed proteins are storage proteins that are synthesized in the rough endoplasmic reticulum (ER) of starchy endosperm cells. Many of these proteins have intra- and intermolecular disulfide bonds. In eukaryotes, the formation of most intramolecular disulfide bonds in the ER is thought to be catalyzed by protein disulfide isomerase (PDI) family proteins. The cDNAs that encode eight groups of bread wheat (Triticum aestivum L.) PDI family proteins have been cloned, and their expression levels in developing wheat grains have been determined. The purpose of the present study was to characterize the enzymatic properties of the wheat PDI family proteins and clarify their expression patterns in wheat caryopses. RESULTS PDI family cDNAs, which are categorized into group I (TaPDIL1Aα, TaPDIL1Aβ, TaPDIL1Aγ, TaPDIL1Aδ, and TaPDIL1B), group II (TaPDIL2), group III (TaPDIL3A), group IV (TaPDIL4D), and group V (TaPDIL5A), were cloned. The expression levels of recombinant TaPDIL1Aα, TaPDIL1B, TaPDIL2, TaPDIL3A, TaPDIL4D, and TaPDIL5A in Escherichia coli were established from the cloned cDNAs. All recombinant proteins were expressed in soluble forms and purified. Aside from TaPDIL3A, the recombinant proteins exhibited oxidative refolding activity on reduced and denatured ribonuclease A. Five groups of PDI family proteins were distributed throughout wheat caryopses, and expression levels of these proteins were higher during grain filling than in the late stage of maturing. Localization of these proteins in the ER was confirmed by fluorescent immunostaining of the immature caryopses. In mature grains, the five groups of PDI family proteins remained in the aleurone cells and the protein matrix of the starchy endosperm. CONCLUSIONS High expression of PDI family proteins during grain filling in the starchy endosperm suggest that these proteins play an important role in forming intramolecular disulfide bonds in seed storage proteins. In addition, these PDI family proteins that remain in the aleurone layers of mature grains likely assist in folding newly synthesized hydrolytic enzymes during germination.
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Affiliation(s)
- Shizuka Kimura
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011 Japan
| | - Yuki Higashino
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011 Japan
| | - Yuki Kitao
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011 Japan
| | - Taro Masuda
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011 Japan
| | - Reiko Urade
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011 Japan
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Cremer JE, Bean SR, Tilley MM, Ioerger BP, Ohm JB, Kaufman RC, Wilson JD, Innes DJ, Gilding EK, Godwin ID. Grain sorghum proteomics: integrated approach toward characterization of endosperm storage proteins in kafirin allelic variants. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:9819-9831. [PMID: 25177767 DOI: 10.1021/jf5022847] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Grain protein composition determines quality traits, such as value for food, feedstock, and biomaterials uses. The major storage proteins in sorghum are the prolamins, known as kafirins. Located primarily on the periphery of the protein bodies surrounding starch, cysteine-rich β- and γ-kafirins may limit enzymatic access to internally positioned α-kafirins and starch. An integrated approach was used to characterize sorghum with allelic variation at the kafirin loci to determine the effects of this genetic diversity on protein expression. Reversed-phase high performance liquid chromatography and lab-on-a-chip analysis showed reductions in alcohol-soluble protein in β-kafirin null lines. Gel-based separation and liquid chromatography-tandem mass spectrometry identified a range of redox active proteins affecting storage protein biochemistry. Thioredoxin, involved in the processing of proteins at germination, has reported impacts on grain digestibility and was differentially expressed across genotypes. Thus, redox states of endosperm proteins, of which kafirins are a subset, could affect quality traits in addition to the expression of proteins.
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Affiliation(s)
- Julia E Cremer
- School of Agriculture and Food Sciences and ⊥Institute for Molecular Bioscience, The University of Queensland , St Lucia, Brisbane, QLD 4072, Australia
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Iizuka M, Wakasa Y, Tsuboi H, Asashima H, Hirota T, Kondo Y, Matsumoto I, Takaiwa F, Sumida T. Suppression of collagen-induced arthritis by oral administration of transgenic rice seeds expressing altered peptide ligands of type II collagen. PLANT BIOTECHNOLOGY JOURNAL 2014; 12:1143-52. [PMID: 24989432 DOI: 10.1111/pbi.12223] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2014] [Revised: 05/25/2014] [Accepted: 06/01/2014] [Indexed: 05/09/2023]
Abstract
Rheumatoid arthritis (RA) is an autoimmune disease associated with the recognition of self proteins secluded in arthritic joints. We previously reported that altered peptide ligands (APLs) of type II collagen (CII256-271) suppress the development of collagen-induced arthritis (CIA). In this study, we generated transgenic rice expressing CII256-271 and APL6 contained in fusion proteins with the rice storage protein glutelin in the seed endosperm. These transgene products successfully and stably accumulated at high levels (7-24 mg/g seeds) in protein storage vacuoles (PB-II) of mature seeds. We examined the efficacy of these transgenic rice seeds by performing oral administration of the seeds to CIA model mice that had been immunized with CII. Treatment with APL6 transgenic rice for 14 days significantly inhibited the development of arthritis (based on clinical score) and delayed disease onset during the early phase of arthritis. These effects were mediated by the induction of IL-10 from CD4(+ ) CD25(-) T cells against CII antigen in splenocytes and inguinal lymph nodes (iLNs), and treatment of APL had no effect on the production of IFN-γ, IL-17, IL-2 or Foxp3(+) Treg cells. These findings suggest that abnormal immune suppressive mechanisms are involved in the therapeutic effect of rice-based oral vaccine expressing high levels of APLs of type II collagen on the autoimmune disease CIA, suggesting that the seed-based mucosal vaccine against CIA functions via a unique mechanism.
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Affiliation(s)
- Mana Iizuka
- Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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Yang X, Xu H, Hao Y, Zhao L, Cai X, Tian J, Zhang M, Han X, Ma S, Cao J, Jiang Y. Endoplasmic reticulum oxidoreductin 1α mediates hepatic endoplasmic reticulum stress in homocysteine-induced atherosclerosis. Acta Biochim Biophys Sin (Shanghai) 2014; 46:902-10. [PMID: 25187414 DOI: 10.1093/abbs/gmu081] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Endoplasmic reticulum (ER) stress is emerging as an important modulator of different pathological process and as a mechanism contributing to homocysteine (Hcy)-induced hepar injury. However, the molecular event that Hcy-induced ER stress in the hepar under the atherosclerosis background is currently unknown. Endoplasmic reticulum oxidoreductin 1α (ERO1α) plays a crucial role in maintaining ER stress function. In this study, we determined the expression of ERO1α in the hepar in hyperhomocysteinemia and the effect of ERO1α in hepacytes ER stress in the presence of Hcy. HHcy model was established by feeding the methionine diet in apolipoprotein-E-deficient (ApoE-/-) mice, and the hepatocytes were incubated with folate and different concentrations of Hcy. Our results showed that Hcy triggered ER stress characterized by an increased contents of glucose-regulated protein 78 (GRP78), protein kinase RNA-like ER kinase (PERK), activating transcription factor (ATF) 6 and X-box binding protein-1 (XBP-1). The ERO1α expressions in HHcy mice and Hcy-treated hepatocytes were decreased compared with those in ApoE-/- group and control hepacytes (P < 0.05), respectively. Knocking-down the expression of ERO1α with small-interfering RNA significantly augmented Hcy-induced ER stress. Meanwhile, the expressions of ER stress-related factor including GRP78, PERK, ATF6 and XBP-1, were significantly decreased when the ERO1α gene was over-expressed in hepacytes. Our results suggested that ERO1α may be involved in Hcy-induced hepar ER stress, and the inhibition of ERO1α expression can accelerate this process.
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Affiliation(s)
- Xiaoling Yang
- Department of Pathophysiology, Basic Medical School, Ningxia Medical University, Key Laboratory of Cardio-Cerebro-Vascular Diseases, Ningxia Medical University, Yinchuan 750004, China
| | - Hua Xu
- Department of Pathophysiology, Basic Medical School, Ningxia Medical University, Key Laboratory of Cardio-Cerebro-Vascular Diseases, Ningxia Medical University, Yinchuan 750004, China
| | - Yinju Hao
- Department of Pharmacology, Ningxia Medical University, Yinchuan 750004, China
| | - Li Zhao
- Department of Clinical Examination, Ningxia Medical University, Yinchuan 750004, China
| | - Xin Cai
- Department of Clinical Examination, Ningxia Medical University, Yinchuan 750004, China
| | - Jue Tian
- Department of Pathophysiology, Basic Medical School, Ningxia Medical University, Key Laboratory of Cardio-Cerebro-Vascular Diseases, Ningxia Medical University, Yinchuan 750004, China
| | - Minghao Zhang
- Department of Pathophysiology, Basic Medical School, Ningxia Medical University, Key Laboratory of Cardio-Cerebro-Vascular Diseases, Ningxia Medical University, Yinchuan 750004, China
| | - Xuebo Han
- Department of Clinical Examination, Ningxia Medical University, Yinchuan 750004, China
| | - Shengchao Ma
- Department of Pathophysiology, Basic Medical School, Ningxia Medical University, Key Laboratory of Cardio-Cerebro-Vascular Diseases, Ningxia Medical University, Yinchuan 750004, China
| | - Jun Cao
- Department of Pathophysiology, Basic Medical School, Ningxia Medical University, Key Laboratory of Cardio-Cerebro-Vascular Diseases, Ningxia Medical University, Yinchuan 750004, China
| | - Yideng Jiang
- Department of Pathophysiology, Basic Medical School, Ningxia Medical University, Key Laboratory of Cardio-Cerebro-Vascular Diseases, Ningxia Medical University, Yinchuan 750004, China
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Ibl V, Stoger E. Live Cell Imaging During Germination Reveals Dynamic Tubular Structures Derived from Protein Storage Vacuoles of Barley Aleurone Cells. PLANTS 2014; 3:442-57. [PMID: 27135513 PMCID: PMC4844346 DOI: 10.3390/plants3030442] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 08/20/2014] [Accepted: 08/21/2014] [Indexed: 01/09/2023]
Abstract
The germination of cereal seeds is a rapid developmental process in which the endomembrane system undergoes a series of dynamic morphological changes to mobilize storage compounds. The changing ultrastructure of protein storage vacuoles (PSVs) in the cells of the aleurone layer has been investigated in the past, but generally this involved inferences drawn from static pictures representing different developmental stages. We used live cell imaging in transgenic barley plants expressing a TIP3-GFP fusion protein as a fluorescent PSV marker to follow in real time the spatially and temporally regulated remodeling and reshaping of PSVs during germination. During late-stage germination, we observed thin, tubular structures extending from PSVs in an actin-dependent manner. No extensions were detected following the disruption of actin microfilaments, while microtubules did not appear to be involved in the process. The previously-undetected tubular PSV structures were characterized by complex movements, fusion events and a dynamic morphology. Their function during germination remains unknown, but might be related to the transport of solutes and metabolites.
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Affiliation(s)
- Verena Ibl
- Department for Applied Genetics and Cell Biology, Molecular Plant Physiology and Crop Biotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, Vienna 1190, Austria.
| | - Eva Stoger
- Department for Applied Genetics and Cell Biology, Molecular Plant Physiology and Crop Biotechnology, University of Natural Resources and Life Sciences, Muthgasse 18, Vienna 1190, Austria.
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Onda Y, Kobori Y. Differential activity of rice protein disulfide isomerase family members for disulfide bond formation and reduction. FEBS Open Bio 2014; 4:730-4. [PMID: 25161881 PMCID: PMC4141933 DOI: 10.1016/j.fob.2014.07.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 07/25/2014] [Accepted: 07/25/2014] [Indexed: 11/30/2022] Open
Abstract
PDIL1;1 efficiently catalyzed both disulfide bond formation and disulfide bond reduction. Two redox-active sites of PDIL1;1 were involved in disulfide reduction. Disulfide reduction activity of PDIL1;1 increased with increasing GSH concentration.
Protein disulfide isomerases (PDIs), a family of thiol-disulfide oxidoreductases that are ubiquitous in all eukaryotes, are the principal catalysts for disulfide bond formation. Here, we investigated three rice (Oryza sativa) PDI family members (PDIL1;1, PDIL1;4, and PDIL2;3) and found that PDIL1;1 exhibited the highest catalytic activity for both disulfide bond formation and disulfide bond reduction. The activity of PDIL1;1-catalyzed disulfide bond reduction, in which two redox-active sites were involved, was enhanced by increasing the glutathione concentration. These results suggest that PDIL1;1 plays primary roles in both disulfide bond formation and disulfide bond reduction, which allow for redox control of protein quality and packaging.
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Affiliation(s)
- Yayoi Onda
- Department of Food and Applied Life Sciences, Yamagata University, 1-23 Wakaba-Machi, Tsuruoka, Yamagata 997-8555, Japan
| | - Yohei Kobori
- Department of Food and Applied Life Sciences, Yamagata University, 1-23 Wakaba-Machi, Tsuruoka, Yamagata 997-8555, Japan
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50
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Onda Y, Miyagi A, Takahara K, Uchimiya H, Kawai-Yamada M. Effects of NAD kinase 2 overexpression on primary metabolite profiles in rice leaves under elevated carbon dioxide. PLANT BIOLOGY (STUTTGART, GERMANY) 2014; 16:819-24. [PMID: 24397549 DOI: 10.1111/plb.12131] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Accepted: 10/16/2013] [Indexed: 05/20/2023]
Abstract
The concentration of carbon dioxide (CO2) in the atmosphere is projected to double by the end of the 21st century. In C3 plants, elevated CO2 concentrations promote photosynthesis but inhibit the assimilation of nitrate into organic nitrogen compounds. Several steps of nitrate assimilation depend on the availability of ATP and sources of reducing power, such as nicotinamide adenine dinucleotide phosphate (NADPH). Plastid-localised NAD kinase 2 (NADK2) plays key roles in increasing the ATP/ADP and NADP(H)/NAD(H) ratios. Here we examined the effects of NADK2 overexpression on primary metabolism in rice (Oryza sativa) leaves in response to elevated CO2. By using capillary electrophoresis mass spectrometry, we showed that the primary metabolite profile of NADK2-overexpressing plants clearly differed from that of wild-type plants under ambient and elevated CO2. In NADK2-overexpressing leaves, expression of the genes encoding glutamine synthetase and glutamate synthase was up-regulated, and the levels of Asn, Gln, Arg, and Lys increased in response to elevated CO2. The present study suggests that overexpression of NADK2 promotes the biosynthesis of nitrogen-rich amino acids under elevated CO2.
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Affiliation(s)
- Y Onda
- Institute for Environmental Science and Technology, Saitama University, Sakura-ku, Saitama, Japan; Department of Food and Applied Life Sciences, Yamagata University, Tsuruoka, Yamagata, Japan
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