1
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Li Q, Yang T, Rui W, Wang H, Wang Y, Yang Z, Xu C, Li P. Genetic Diversification of Starch Branching Enzymes during Maize Domestication and Improvement. Genes (Basel) 2023; 14:genes14051068. [PMID: 37239428 DOI: 10.3390/genes14051068] [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: 03/16/2023] [Revised: 05/06/2023] [Accepted: 05/10/2023] [Indexed: 05/28/2023] Open
Abstract
Elucidating the genetic basis of starch pasting and gelatinization properties is crucial for enhancing the quality of maize and its utility as feed and industrial raw material. In maize, ZmSBE genes encode important starch branching enzymes in the starch biosynthesis pathway. In this study, we re-sequenced the genomic sequences of ZmSBEI, ZmSBEIIa, ZmSBEIIb, and ZmSBEIII in three lines called 335 inbred lines, 68 landrace lines, and 32 teosinte lines. Analyses of nucleotide polymorphisms and haplotype diversity revealed differences in the selection patterns of ZmSBEI, ZmSBEIIa, ZmSBEIIb, and ZmSBEIII during maize domestication and improvement. A marker-trait association analysis of inbred lines detected 22 significant loci, including 18 SNPs and 4 indels significantly associated with three maize starch physicochemical properties. The allele frequencies of two variants (SNP17249C and SNP5055G) were examined in three lines. The frequency of SNP17249C in ZmSBEIIb was highest in teosinte lines, followed by landrace lines, and inbred lines, whereas there were no significant differences in the frequency of SNP5055G in ZmSBEIII among the three lines. These results suggest that ZmSBE genes play an important role in the phenotypic variations in the starch physicochemical properties in maize. The genetic variants detected in this study may be used to develop functional markers for improving maize starch quality.
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Affiliation(s)
- Qi Li
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College of Yangzhou University, Yangzhou 225009, China
| | - Tiantian Yang
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College of Yangzhou University, Yangzhou 225009, China
| | - Wenye Rui
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College of Yangzhou University, Yangzhou 225009, China
| | - Houmiao Wang
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College of Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
| | - Yunyun Wang
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College of Yangzhou University, Yangzhou 225009, China
| | - Zefeng Yang
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College of Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Chenwu Xu
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College of Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Pengcheng Li
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics of the Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agricultural College of Yangzhou University, Yangzhou 225009, China
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
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2
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Li R, Zheng W, Jiang M, Zhang H. A review of starch biosynthesis in cereal crops and its potential breeding applications in rice ( Oryza Sativa L.). PeerJ 2022; 9:e12678. [PMID: 35036154 PMCID: PMC8710062 DOI: 10.7717/peerj.12678] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 12/02/2021] [Indexed: 11/20/2022] Open
Abstract
Starch provides primary storage of carbohydrates, accounting for approximately 85% of the dry weight of cereal endosperm. Cereal seeds contribute to maximum annual starch production and provide the primary food for humans and livestock worldwide. However, the growing demand for starch in food and industry and the increasing loss of arable land with urbanization emphasizes the urgency to understand starch biosynthesis and its regulation. Here, we first summarized the regulatory signaling pathways about leaf starch biosynthesis. Subsequently, we paid more attention to how transcriptional factors (TFs) systematically respond to various stimulants via the regulation of the enzymes during starch biosynthesis. Finally, some strategies to improve cereal yield and quality were put forward based on the previous reports. This review would collectively help to design future studies on starch biosynthesis in cereal crops.
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Affiliation(s)
- Ruiqing Li
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou, China.,College of Agronomy, Anhui Agricultural University, Hefei, China
| | - Wenyin Zheng
- College of Agronomy, Anhui Agricultural University, Hefei, China
| | - Meng Jiang
- State Key Laboratory of Rice Biology, Institute of Crop Sciences, Zhejiang University, Hangzhou, China
| | - Huali Zhang
- State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou, China
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3
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Mukherjee S, Koramutla MK, Levin DB, Ayele BT. Genetic variation in transcriptional regulation of wheat seed starch content and its conversion to bioethanol. Food Energy Secur 2021. [DOI: 10.1002/fes3.339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Shalini Mukherjee
- Department of Plant Science University of Manitoba Winnipeg Manitoba Canada
| | | | - David B. Levin
- Department of Biosystems Engineering University of Manitoba Winnipeg Manitoba Canada
| | - Belay T. Ayele
- Department of Plant Science University of Manitoba Winnipeg Manitoba Canada
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4
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Botticella E, Savatin DV, Sestili F. The Triple Jags of Dietary Fibers in Cereals: How Biotechnology Is Longing for High Fiber Grains. FRONTIERS IN PLANT SCIENCE 2021; 12:745579. [PMID: 34594354 PMCID: PMC8477015 DOI: 10.3389/fpls.2021.745579] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 08/18/2021] [Indexed: 05/03/2023]
Abstract
Cereals represent an important source of beneficial compounds for human health, such as macro- and micronutrients, vitamins, and bioactive molecules. Generally, the consumption of whole-grain products is associated with significant health benefits, due to the elevated amount of dietary fiber (DF). However, the consumption of whole-grain foods is still modest compared to more refined products. In this sense, it is worth focusing on the increase of DF fractions inside the inner compartment of the seed, the endosperm, which represents the main part of the derived flour. The main components of the grain fiber are arabinoxylan (AX), β-glucan (βG), and resistant starch (RS). These three components are differently distributed in grains, however, all of them are represented in the endosperm. AX and βG, classified as non-starch polysaccharides (NSP), are in cell walls, whereas, RS is in the endosperm, being a starch fraction. As the chemical structure of DFs influences their digestibility, the identification of key actors involved in their metabolism can pave the way to improve their function in human health. Here, we reviewed the main achievements of plant biotechnologies in DFs manipulation in cereals, highlighting new genetic targets to be exploited, and main issues to face to increase the potential of cereals in fighting malnutrition.
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Affiliation(s)
- Ermelinda Botticella
- Institute of Sciences of Food Production (ISPA), National Research Council (CNR), Lecce, Italy
| | | | - Francesco Sestili
- Department of Agriculture and Forest Sciences (DAFNE), University of Tuscia, Viterbo, Italy
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5
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Adegoke TV, Wang Y, Chen L, Wang H, Liu W, Liu X, Cheng YC, Tong X, Ying J, Zhang J. Posttranslational Modification of Waxy to Genetically Improve Starch Quality in Rice Grain. Int J Mol Sci 2021; 22:4845. [PMID: 34063649 PMCID: PMC8124582 DOI: 10.3390/ijms22094845] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 04/26/2021] [Accepted: 04/29/2021] [Indexed: 01/07/2023] Open
Abstract
The waxy (Wx) gene, encoding the granule-bound starch synthase (GBSS), is responsible for amylose biosynthesis and plays a crucial role in defining eating and cooking quality. The waxy locus controls both the non-waxy and waxy rice phenotypes. Rice starch can be altered into various forms by either reducing or increasing the amylose content, depending on consumer preference and region. Low-amylose rice is preferred by consumers because of its softness and sticky appearance. A better way of improving crops other than downregulation and overexpression of a gene or genes may be achieved through the posttranslational modification of sites or regulatory enzymes that regulate them because of their significance. The impact of posttranslational GBSSI modifications on extra-long unit chains (ELCs) remains largely unknown. Numerous studies have been reported on different crops, such as wheat, maize, and barley, but the rice starch granule proteome remains largely unknown. There is a need to improve the yield of low-amylose rice by employing posttranslational modification of Wx, since the market demand is increasing every day in order to meet the market demand for low-amylose rice in the regional area that prefers low-amylose rice, particularly in China. In this review, we have conducted an in-depth review of waxy rice, starch properties, starch biosynthesis, and posttranslational modification of waxy protein to genetically improve starch quality in rice grains.
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Affiliation(s)
- Tosin Victor Adegoke
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China; (T.V.A.); (Y.W.); (L.C.); (H.W.); (W.L.); (X.L.); (Y.-C.C.); (X.T.); (J.Y.)
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yifeng Wang
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China; (T.V.A.); (Y.W.); (L.C.); (H.W.); (W.L.); (X.L.); (Y.-C.C.); (X.T.); (J.Y.)
| | - Lijuan Chen
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China; (T.V.A.); (Y.W.); (L.C.); (H.W.); (W.L.); (X.L.); (Y.-C.C.); (X.T.); (J.Y.)
| | - Huimei Wang
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China; (T.V.A.); (Y.W.); (L.C.); (H.W.); (W.L.); (X.L.); (Y.-C.C.); (X.T.); (J.Y.)
| | - Wanning Liu
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China; (T.V.A.); (Y.W.); (L.C.); (H.W.); (W.L.); (X.L.); (Y.-C.C.); (X.T.); (J.Y.)
| | - Xingyong Liu
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China; (T.V.A.); (Y.W.); (L.C.); (H.W.); (W.L.); (X.L.); (Y.-C.C.); (X.T.); (J.Y.)
| | - Yi-Chen Cheng
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China; (T.V.A.); (Y.W.); (L.C.); (H.W.); (W.L.); (X.L.); (Y.-C.C.); (X.T.); (J.Y.)
| | - Xiaohong Tong
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China; (T.V.A.); (Y.W.); (L.C.); (H.W.); (W.L.); (X.L.); (Y.-C.C.); (X.T.); (J.Y.)
| | - Jiezheng Ying
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China; (T.V.A.); (Y.W.); (L.C.); (H.W.); (W.L.); (X.L.); (Y.-C.C.); (X.T.); (J.Y.)
| | - Jian Zhang
- State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China; (T.V.A.); (Y.W.); (L.C.); (H.W.); (W.L.); (X.L.); (Y.-C.C.); (X.T.); (J.Y.)
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6
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Nakamura Y, Ono M, Hatta T, Kainuma K, Yashiro K, Matsuba G, Matsubara A, Miyazato A, Mizutani G. Effects of BEIIb-Deficiency on the Cluster Structure of Amylopectin and the Internal Structure of Starch Granules in Endosperm and Culm of Japonica-Type Rice. FRONTIERS IN PLANT SCIENCE 2020; 11:571346. [PMID: 33312184 DOI: 10.3389/fpls.2020.571346.ecollection] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 10/29/2020] [Indexed: 05/24/2023]
Abstract
It is known that one of starch branching enzyme (BE) isoforms, BEIIb, plays a specific role not only in the synthesis of distinct amylopectin cluster structure, but also in the formation of the internal structure of starch granules in rice endosperm because in its absence the starch crystalline polymorph changes to the B-type from the typical A-type found in the wild-type (WT) cereal endosperm starch granules. In the present study, to examine the contribution of BEIIb to the amylopectin cluster structure, the chain-length distributions of amylopectin and its phosphorylase-limit dextrins (Φ-LD) from endosperm and culm of a null be2b mutant called amylose-extender (ae) mutant line, EM10, were compared with those of its WT cultivar, Kinmaze, of japonica rice. The results strongly suggest that BEIIb specifically formed new short chains whose branch points were localized in the basal part of the crystalline lamellae and presumably in the intermediate between the crystalline and amorphous lamellae of amylopectin clusters in the WT endosperm, whereas in its absence branch points which were mainly formed by BEI were only located in the amorphous lamellae of amylopectin. These differences in the cluster structure of amylopectin between Kinmaze and EM10 endosperm were considered to be responsible for the differences in the A-type and B-type crystalline structures of starch granules between Kinmaze and EM10, respectively. The changes in internal structure of starch granules caused by BEIIb were analyzed by wide angle X-ray diffraction, small-angle X-ray scattering, solid state 13C NMR, and optical sum frequency generation spectroscopy. It was noted that the size the amylopectin cluster in ae endosperm (approximately 8.24 nm) was significantly smaller than that in WT endosperm (approximately 8.81 nm). Based on the present results, we proposed a model for the cluster structure of amylopectin in WT and ae mutant of rice endosperm. We also hypothesized the role of BEIIa in amylopectin biosynthesis in culm where BEIIb was not expressed and instead BEIIa was the major BE component in WT of rice.
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Affiliation(s)
- Yasunori Nakamura
- Starch Technologies, Co., Ltd., Akita Prefectural University, Akita, Japan
- Akita Natural Science Laboratory, Katagami, Japan
| | - Masami Ono
- Akita Natural Science Laboratory, Katagami, Japan
| | - Tamao Hatta
- Faculty of Risk and Crisis Management, Chiba Institute of Science, Choshi, Japan
| | | | - Kazuki Yashiro
- Graduate School of Organic Materials Science, Yamagata University, Yonezawa, Japan
| | - Go Matsuba
- Graduate School of Organic Materials Science, Yamagata University, Yonezawa, Japan
| | - Akira Matsubara
- School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Japan
| | - Akio Miyazato
- School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Japan
| | - Goro Mizutani
- School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Japan
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7
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Tetlow IJ, Bertoft E. A Review of Starch Biosynthesis in Relation to the Building Block-Backbone Model. Int J Mol Sci 2020; 21:E7011. [PMID: 32977627 PMCID: PMC7582286 DOI: 10.3390/ijms21197011] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 09/15/2020] [Accepted: 09/16/2020] [Indexed: 01/31/2023] Open
Abstract
Starch is a water-insoluble polymer of glucose synthesized as discrete granules inside the stroma of plastids in plant cells. Starch reserves provide a source of carbohydrate for immediate growth and development, and act as long term carbon stores in endosperms and seed tissues for growth of the next generation, making starch of huge agricultural importance. The starch granule has a highly complex hierarchical structure arising from the combined actions of a large array of enzymes as well as physicochemical self-assembly mechanisms. Understanding the precise nature of granule architecture, and how both biological and abiotic factors determine this structure is of both fundamental and practical importance. This review outlines current knowledge of granule architecture and the starch biosynthesis pathway in relation to the building block-backbone model of starch structure. We highlight the gaps in our knowledge in relation to our understanding of the structure and synthesis of starch, and argue that the building block-backbone model takes accurate account of both structural and biochemical data.
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Affiliation(s)
- Ian J. Tetlow
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, ON N1G 2W1, Canada
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8
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Yang Y, Chai Y, Zhang X, Lu S, Zhao Z, Wei D, Chen L, Hu YG. Multi-Locus GWAS of Quality Traits in Bread Wheat: Mining More Candidate Genes and Possible Regulatory Network. FRONTIERS IN PLANT SCIENCE 2020; 11:1091. [PMID: 32849679 PMCID: PMC7411135 DOI: 10.3389/fpls.2020.01091] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 07/02/2020] [Indexed: 05/20/2023]
Abstract
In wheat breeding, improved quality traits, including grain quality and dough rheological properties, have long been a critical goal. To understand the genetic basis of key quality traits of wheat, two single-locus and five multi-locus GWAS models were performed for six grain quality traits and three dough rheological properties based on 19, 254 SNPs in 267 bread wheat accessions. As a result, 299 quantitative trait nucleotides (QTNs) within 105 regions were identified to be associated with these quality traits in four environments. Of which, 40 core QTN regions were stably detected in at least three environments, 19 of which were novel. Compared with the previous studies, these novel QTN regions explained smaller phenotypic variation, which verified the advantages of the multi-locus GWAS models in detecting important small effect QTNs associated with complex traits. After characterization of the function and expression in-depth, 67 core candidate genes involved in protein/sugar synthesis, histone modification and the regulation of transcription factor were observed to be associated with the formation of grain quality, which showed that multi-level regulations influenced wheat grain quality. Finally, a preliminary network of gene regulation that may affect wheat quality formation was inferred. This study verified the power and reliability of multi-locus GWAS methods in wheat quality trait research, and increased the understanding of wheat quality formation mechanisms. The detected QTN regions and candidate genes in this study could be further used for gene cloning and marker-assisted selection in high-quality breeding of bread wheat.
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Affiliation(s)
- Yang Yang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, China
| | - Yongmao Chai
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, China
| | - Xuan Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, China
| | - Shan Lu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, China
| | - Zhangchen Zhao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, China
| | - Di Wei
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, China
| | - Liang Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, China
| | - Yin-Gang Hu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, China
- Institute of Water Saving Agriculture in Arid Regions of China, Northwest A&F University, Yangling, China
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9
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Starch and Glycogen Analyses: Methods and Techniques. Biomolecules 2020; 10:biom10071020. [PMID: 32660096 PMCID: PMC7407607 DOI: 10.3390/biom10071020] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/06/2020] [Accepted: 07/07/2020] [Indexed: 01/16/2023] Open
Abstract
For complex carbohydrates, such as glycogen and starch, various analytical methods and techniques exist allowing the detailed characterization of these storage carbohydrates. In this article, we give a brief overview of the most frequently used methods, techniques, and results. Furthermore, we give insights in the isolation, purification, and fragmentation of both starch and glycogen. An overview of the different structural levels of the glucans is given and the corresponding analytical techniques are discussed. Moreover, future perspectives of the analytical needs and the challenges of the currently developing scientific questions are included.
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10
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Zhou W, Zhao S, He S, Ma Q, Lu X, Hao X, Wang H, Yang J, Zhang P. Production of very-high-amylose cassava by post-transcriptional silencing of branching enzyme genes. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2020; 62:832-846. [PMID: 31180179 DOI: 10.1111/jipb.12848] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Accepted: 05/30/2019] [Indexed: 06/09/2023]
Abstract
High amylose starch can be produced by plants deficient in the function of branching enzymes (BEs). Here we report the production of transgenic cassava (Manihot esculenta Crantz) with starches containing up to 50% amylose due to the constitutive expression of hair-pin dsRNAs targeting the BE1 or BE2 genes. All BE1-RNAi plant lines (BE1i) and BE2-RNAi plant lines (BE2i) were grown up in the field, but with reduced total biomass production. Considerably high amylose content in the storage roots of BE2i plant lines was achieved. Storage starch granules of BE1i and BE2i plants had similar morphology as wild type (WT), however, the size of BE1i starch granules were bigger than that of WT. Comparisons of amylograms and thermograms of all three sources of storage starches revealed dramatic changes to the pasting properties and a higher melting temperature for BE2i starches. Glucan chain length distribution analysis showed a slight increase in chains of DP>36 in BE1i lines and a dramatic increase in glucan chains between DP 10-20 and DP>40 in BE2i lines. Furthermore, BE2i starches displayed a B-type X-ray diffraction pattern instead of the A-type pattern found in BE1i and WT starches. Therefore, cassava BE1 and BE2 function differently in storage root starch biosynthesis.
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Affiliation(s)
- Wenzhi Zhou
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai, 200032, China
| | - Shanshan Zhao
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai, 200032, China
- Shanghai Key Laboratory of Plant Functional Genomics and Resources, Shanghai Chenshan Plant Science Research Center, Shanghai Chenshan Botanical Garden, the Chinese Academy of Sciences, Shanghai, 201602, China
| | - Shutao He
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai, 200032, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qiuxiang Ma
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai, 200032, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xinlu Lu
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai, 200032, China
| | - Xiaomeng Hao
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai, 200032, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hongxia Wang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai, 200032, China
| | - Jun Yang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai, 200032, China
- Shanghai Key Laboratory of Plant Functional Genomics and Resources, Shanghai Chenshan Plant Science Research Center, Shanghai Chenshan Botanical Garden, the Chinese Academy of Sciences, Shanghai, 201602, China
| | - Peng Zhang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai, 200032, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
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11
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Nakamura Y, Ono M, Hatta T, Kainuma K, Yashiro K, Matsuba G, Matsubara A, Miyazato A, Mizutani G. Effects of BEIIb-Deficiency on the Cluster Structure of Amylopectin and the Internal Structure of Starch Granules in Endosperm and Culm of Japonica-Type Rice. FRONTIERS IN PLANT SCIENCE 2020; 11:571346. [PMID: 33312184 PMCID: PMC7704622 DOI: 10.3389/fpls.2020.571346] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 10/29/2020] [Indexed: 05/04/2023]
Abstract
It is known that one of starch branching enzyme (BE) isoforms, BEIIb, plays a specific role not only in the synthesis of distinct amylopectin cluster structure, but also in the formation of the internal structure of starch granules in rice endosperm because in its absence the starch crystalline polymorph changes to the B-type from the typical A-type found in the wild-type (WT) cereal endosperm starch granules. In the present study, to examine the contribution of BEIIb to the amylopectin cluster structure, the chain-length distributions of amylopectin and its phosphorylase-limit dextrins (Φ-LD) from endosperm and culm of a null be2b mutant called amylose-extender (ae) mutant line, EM10, were compared with those of its WT cultivar, Kinmaze, of japonica rice. The results strongly suggest that BEIIb specifically formed new short chains whose branch points were localized in the basal part of the crystalline lamellae and presumably in the intermediate between the crystalline and amorphous lamellae of amylopectin clusters in the WT endosperm, whereas in its absence branch points which were mainly formed by BEI were only located in the amorphous lamellae of amylopectin. These differences in the cluster structure of amylopectin between Kinmaze and EM10 endosperm were considered to be responsible for the differences in the A-type and B-type crystalline structures of starch granules between Kinmaze and EM10, respectively. The changes in internal structure of starch granules caused by BEIIb were analyzed by wide angle X-ray diffraction, small-angle X-ray scattering, solid state 13C NMR, and optical sum frequency generation spectroscopy. It was noted that the size the amylopectin cluster in ae endosperm (approximately 8.24 nm) was significantly smaller than that in WT endosperm (approximately 8.81 nm). Based on the present results, we proposed a model for the cluster structure of amylopectin in WT and ae mutant of rice endosperm. We also hypothesized the role of BEIIa in amylopectin biosynthesis in culm where BEIIb was not expressed and instead BEIIa was the major BE component in WT of rice.
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Affiliation(s)
- Yasunori Nakamura
- Starch Technologies, Co., Ltd., Akita Prefectural University, Akita, Japan
- Akita Natural Science Laboratory, Katagami, Japan
- *Correspondence: Yasunori Nakamura,
| | - Masami Ono
- Akita Natural Science Laboratory, Katagami, Japan
| | - Tamao Hatta
- Faculty of Risk and Crisis Management, Chiba Institute of Science, Choshi, Japan
| | | | - Kazuki Yashiro
- Graduate School of Organic Materials Science, Yamagata University, Yonezawa, Japan
| | - Go Matsuba
- Graduate School of Organic Materials Science, Yamagata University, Yonezawa, Japan
| | - Akira Matsubara
- School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Japan
| | - Akio Miyazato
- School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Japan
| | - Goro Mizutani
- School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Japan
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12
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Intra-Sample Heterogeneity of Potato Starch Reveals Fluctuation of Starch-Binding Proteins According to Granule Morphology. PLANTS 2019; 8:plants8090324. [PMID: 31487879 PMCID: PMC6784226 DOI: 10.3390/plants8090324] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 08/27/2019] [Accepted: 08/29/2019] [Indexed: 11/26/2022]
Abstract
Starch granule morphology is highly variable depending on the botanical origin. Moreover, all investigated plant species display intra-tissular variability of granule size. In potato tubers, the size distribution of starch granules follows a unimodal pattern with diameters ranging from 5 to 100 µm. Several evidences indicate that granule morphology in plants is related to the complex starch metabolic pathway. However, the intra-sample variability of starch-binding metabolic proteins remains unknown. Here, we report on the molecular characterization of size-fractionated potato starch granules with average diameters of 14.2 ± 3.7 µm, 24.5 ± 6.5 µm, 47.7 ± 12.8 µm, and 61.8 ± 17.4 µm. In addition to changes in the phosphate contents as well as small differences in the amylopectin structure, we found that the starch-binding protein stoichiometry varies significantly according to granule size. Label-free quantitative proteomics of each granule fraction revealed that individual proteins can be grouped according to four distinct abundance patterns. This study corroborates that the starch proteome may influence starch granule growth and architecture and opens up new perspectives in understanding the dynamics of starch biosynthesis.
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13
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Goren A, Ashlock D, Tetlow IJ. Starch formation inside plastids of higher plants. PROTOPLASMA 2018; 255:1855-1876. [PMID: 29774409 DOI: 10.1007/s00709-018-1259-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 05/03/2018] [Indexed: 05/09/2023]
Abstract
Starch is a water-insoluble polyglucan synthesized inside the plastid stroma within plant cells, serving a crucial role in the carbon budget of the whole plant by acting as a short-term and long-term store of energy. The highly complex, hierarchical structure of the starch granule arises from the actions of a large suite of enzyme activities, in addition to physicochemical self-assembly mechanisms. This review outlines current knowledge of the starch biosynthetic pathway operating in plant cells in relation to the micro- and macro-structures of the starch granule. We highlight the gaps in our knowledge, in particular, the relationship between enzyme function and operation at the molecular level and the formation of the final, macroscopic architecture of the granule.
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Affiliation(s)
- Asena Goren
- Department of Mathematics and Statistics, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Daniel Ashlock
- Department of Mathematics and Statistics, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Ian J Tetlow
- Department of Molecular and Cellular Biology, College of Biological Sciences, University of Guelph, Guelph, ON, N1G 2W1, Canada.
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14
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Sawada T, Itoh M, Nakamura Y. Contributions of Three Starch Branching Enzyme Isozymes to the Fine Structure of Amylopectin in Rice Endosperm. FRONTIERS IN PLANT SCIENCE 2018; 9:1536. [PMID: 30405671 PMCID: PMC6206275 DOI: 10.3389/fpls.2018.01536] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 09/28/2018] [Indexed: 05/07/2023]
Abstract
Three starch branching enzyme (BE) isozymes, BEI, BEIIa, and BEIIb, are involved in starch biosynthesis in rice endosperm. Past in vivo and in vitro studies have suggested that each BE isozyme plays a distinct role in forming the fine structure of amylopectin. To elucidate more details of their roles, we prepared DNA constructs in which all the possible combinations of the expressions of these three isozymes were suppressed in developing rice endosperm. Analysis of the chain-length distributions of amylopectin produced under these various conditions confirmed the contributions of the individual BE isozymes to the fine structure of amylopectin in rice endosperm. Among these isozymes, the impact of loss of BEIIb activity on amylopectin fine structure was most remarkable and indicated that it plays a specific role in the synthesis of short chains with a 6-13 degree of polymerization (DP). The contribution of BEI to the amylopectin synthesis was unclear when only BEI activity was reduced. It was clear, however, when both BEI and BEIIb activities were substantially inhibited. The DP11-22 intermediate chains were markedly reduced in the ΔBEI/BEIIb line compared with the ΔBEIIb line, indicating that BEI plays a distinct role in the synthesis of these intermediate chains. Although no substantial change in amylopectin chain profile was detected in the ΔBEIIa line, the role of BEIIa could be deciphered by analyzing amylopectin fine structure from the ΔBEI/BEIIa/BEIIb line in comparison to that from ΔBEI/BEIIb line. This strongly suggests that BEIIa compensates for the role of BEI, rather than that of BEIIb, by forming intermediate chains of DP11-22. In addition, the new possibility that BEIIa is involved in the formation of starch granules in rice endosperm was suggested because the onset temperature for gelatinization of starch granules in the ΔBEIIa/BEIIb line was significantly higher than that in the ΔBEIIb line. In summary, the present study highlights the distinct roles of BEI, BEIIa, and BEIIb in the synthesis of amylopectin in developing rice endosperm.
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Affiliation(s)
- Takayuki Sawada
- Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Mizuho Itoh
- Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Yasunori Nakamura
- Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
- Akita Natural Science Laboratory, Akita, Japan
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15
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Helle S, Bray F, Verbeke J, Devassine S, Courseaux A, Facon M, Tokarski C, Rolando C, Szydlowski N. Proteome Analysis of Potato Starch Reveals the Presence of New Starch Metabolic Proteins as Well as Multiple Protease Inhibitors. FRONTIERS IN PLANT SCIENCE 2018; 9:746. [PMID: 29963063 PMCID: PMC6013586 DOI: 10.3389/fpls.2018.00746] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 05/15/2018] [Indexed: 05/20/2023]
Abstract
Starch bound proteins mainly include enzymes from the starch biosynthesis pathway. Recently, new functions in starch molecular assembly or active protein targeting were also proposed for starch associated proteins. The potato genome sequence reveals 77 loci encoding starch metabolizing enzymes with the identification of previously unknown putative isoforms. Here we show by bottom-up proteomics that most of the starch biosynthetic enzymes in potato remain associated with starch even after washing with SDS or protease treatment of the granule surface. Moreover, our study confirmed the presence of PTST1 (Protein Targeting to Starch), ESV1 (Early StarVation1) and LESV (Like ESV), that have recently been identified in Arabidopsis. In addition, we report on the presence of a new isoform of starch synthase, SS6, containing both K-X-G-G-L catalytic motifs. Furthermore, multiple protease inhibitors were also identified that are cleared away from starch by SDS and thermolysin treatments. Our results indicate that SS6 may play a yet uncharacterized function in starch biosynthesis and open new perspectives both in understanding storage starch metabolism as well as breeding improved potato lines.
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Affiliation(s)
- Stanislas Helle
- Univ. Lille, CNRS, UMR8576 – UGSF – Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
- Univ. Lille, CNRS, USR 3290 – MSAP – Miniaturisation pour la Synthèse, l’Analyse et la Protéomique, Lille, France
| | - Fabrice Bray
- Univ. Lille, CNRS, USR 3290 – MSAP – Miniaturisation pour la Synthèse, l’Analyse et la Protéomique, Lille, France
| | - Jérémy Verbeke
- Univ. Lille, CNRS, USR 3290 – MSAP – Miniaturisation pour la Synthèse, l’Analyse et la Protéomique, Lille, France
| | - Stéphanie Devassine
- Univ. Lille, CNRS, USR 3290 – MSAP – Miniaturisation pour la Synthèse, l’Analyse et la Protéomique, Lille, France
| | - Adeline Courseaux
- Univ. Lille, CNRS, UMR8576 – UGSF – Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
| | - Maud Facon
- Univ. Lille, CNRS, UMR8576 – UGSF – Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
- Univ. Lille, CNRS, USR 3290 – MSAP – Miniaturisation pour la Synthèse, l’Analyse et la Protéomique, Lille, France
| | - Caroline Tokarski
- Univ. Lille, CNRS, USR 3290 – MSAP – Miniaturisation pour la Synthèse, l’Analyse et la Protéomique, Lille, France
| | - Christian Rolando
- Univ. Lille, CNRS, USR 3290 – MSAP – Miniaturisation pour la Synthèse, l’Analyse et la Protéomique, Lille, France
| | - Nicolas Szydlowski
- Univ. Lille, CNRS, UMR8576 – UGSF – Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
- Univ. Lille, CNRS, USR 3290 – MSAP – Miniaturisation pour la Synthèse, l’Analyse et la Protéomique, Lille, France
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16
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Kumar R, Mukherjee S, Ayele BT. Molecular aspects of sucrose transport and its metabolism to starch during seed development in wheat: A comprehensive review. Biotechnol Adv 2018; 36:954-967. [PMID: 29499342 DOI: 10.1016/j.biotechadv.2018.02.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 01/27/2018] [Accepted: 02/24/2018] [Indexed: 10/17/2022]
Abstract
Wheat is one of the most important crops globally, and its grain is mainly used for human food, accounting for 20% of the total dietary calories. It is also used as animal feed and as a raw material for a variety of non-food and non-feed industrial products such as a feedstock for the production of bioethanol. Starch is the major constituent of a wheat grain, as a result, it is considered as a critical determinant of wheat yield and quality. The amount and composition of starch deposited in wheat grains is controlled primarily by sucrose transport from source tissues to the grain and its conversion to starch. Therefore, elucidation of the molecular mechanisms regulating these physiological processes provides important opportunities to improve wheat starch yield and quality through biotechnological approaches. This review comprehensively discusses the current understanding of the molecular aspects of sucrose transport and sucrose-to-starch metabolism in wheat grains. It also highlights the advances and prospects of starch biotechnology in wheat.
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Affiliation(s)
- Rohit Kumar
- Department of Plant Science, University of Manitoba, 222 Agriculture Building, Winnipeg, Manitoba R3T 2N2, Canada
| | - Shalini Mukherjee
- Department of Plant Science, University of Manitoba, 222 Agriculture Building, Winnipeg, Manitoba R3T 2N2, Canada
| | - Belay T Ayele
- Department of Plant Science, University of Manitoba, 222 Agriculture Building, Winnipeg, Manitoba R3T 2N2, Canada.
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17
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Guo J, Dai S, Li H, Liu A, Liu C, Cheng D, Cao X, Chu X, Zhai S, Liu J, Zhao Z, Song J. Identification and Expression Analysis of Wheat TaGF14 Genes. Front Genet 2018; 9:12. [PMID: 29441089 PMCID: PMC5797578 DOI: 10.3389/fgene.2018.00012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Accepted: 01/10/2018] [Indexed: 01/18/2023] Open
Abstract
The 14-3-3 gene family members play key roles in various cellular processes. However, little is known about the numbers and roles of 14-3-3 genes in wheat. The aims of this study were to identify TaGF14 numbers in wheat by searching its whole genome through blast, to study the phylogenetic relationships with other plant species and to discuss the functions of TaGF14s. The results showed that common wheat harbored 20 TaGF14 genes, located on wheat chromosome groups 2, 3, 4, and 7. Out of them, eighteen TaGF14s are non-ε proteins, and two wheat TaGF14 genes, TaGF14i and TaGF14f, are ε proteins. Phylogenetic analysis indicated that these genes were divided into six clusters: cluster 1 (TaGF14d, TaGF14g, TaGF14j, TaGF14h, TaGF14c, and TaGF14n); cluster 2 (TaGF14k); cluster 3 (TaGF14b, TaGF14l, TaGF14m, and TaGF14s); cluster 4 (TaGF14a, TaGF14e, and TaGF14r); cluster 5 (TaGF14i and TaGF14f); and cluster 6 (TaGF14o, TaGF14p, TaGF14q, and TaGF14t). Tissue-specific gene expressions suggested that all TaGF14s were likely constitutively expressed, except two genes, i.e., TaGF14p and TaGF14f. And the highest amount of TaGF14 transcripts were observed in developing grains at 20 days post anthesis (DPA), especially for TaGF14j and TaGF14l. After drought stress, five genes, i.e., TaGF14c, TaGF14d, TaGF14g, TaGF14h, and TaGF14j, were up-regulated expression under drought stress for both 1 and 6 h, suggesting these genes played vital role in combating against drought stress. However, all the TaGF14s were down-regulated expression under heat stress for both 1 and 6 h, indicating TaGF14s may be negatively associated with heat stress by reducing the expression to combat heat stress or through other pathways. These results suggested that cluster 1, e.g., TaGF14j, may participate in the whole wheat developing stages, e.g., grain-filling (starch biosynthesis) and may also participate in combating against drought stress. Subsequently, a homolog of TaGF14j, TaGF14-JM22, were cloned by RACE and used to validate its function. Immunoblotting results showed that TaGF14-JM22 protein, closely related to TaGF14d, TaGF14g, and TaGF14j, can interact with AGP-L, SSI, SSII, SBEIIa, and SBEIIb in developing grains, suggesting that TaGF14s located on group 4 may be involved in starch biosynthesis. Therefore, it is possible to develop starch-rich wheat cultivars by modifying TaGF14s.
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Affiliation(s)
- Jun Guo
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Shuang Dai
- Shandong Center of Crop Germplasm Resource, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Haosheng Li
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Aifeng Liu
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Cheng Liu
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Dungong Cheng
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Xinyou Cao
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Xiusheng Chu
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Shengnan Zhai
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Jianjun Liu
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Zhendong Zhao
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Jianmin Song
- National Engineering Laboratory for Wheat and Maize, Key Laboratory of Wheat Biology and Genetic Improvement in North Yellow and Huai River Valley, Ministry of Agriculture, Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
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18
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Abstract
The starch-rich endosperms of the Poaceae, which includes wild grasses and their domesticated descendents the cereals, have provided humankind and their livestock with the bulk of their daily calories since the dawn of civilization up to the present day. There are currently unprecedented pressures on global food supplies, largely resulting from population growth, loss of agricultural land that is linked to increased urbanization, and climate change. Since cereal yields essentially underpin world food and feed supply, it is critical that we understand the biological factors contributing to crop yields. In particular, it is important to understand the biochemical pathway that is involved in starch biosynthesis, since this pathway is the major yield determinant in the seeds of six out of the top seven crops grown worldwide. This review outlines the critical stages of growth and development of the endosperm tissue in the Poaceae, including discussion of carbon provision to the growing sink tissue. The main body of the review presents a current view of our understanding of storage starch biosynthesis, which occurs inside the amyloplasts of developing endosperms.
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19
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Yu H, Wang T. Proteomic Dissection of Endosperm Starch Granule Associated Proteins Reveals a Network Coordinating Starch Biosynthesis and Amino Acid Metabolism and Glycolysis in Rice Endosperms. FRONTIERS IN PLANT SCIENCE 2016; 7:707. [PMID: 27252723 PMCID: PMC4879773 DOI: 10.3389/fpls.2016.00707] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Accepted: 05/09/2016] [Indexed: 05/07/2023]
Abstract
Starch biosynthesis and starch granule packaging in cereal endosperms involve a coordinated action of starch biosynthesis enzymes and coordination with other metabolisms. Because directly binding to starch granules, starch granule-associated proteins (SGAPs) are essential to understand the underlying mechanisms, however the information on SGAPs remains largely unknown. Here, we dissected developmentally changed SGAPs from developing rice endosperms from 10 to 20 days after flowering (DAF). Starch granule packaging was not completed at 10 DAF, and was finished in the central endosperm at 15 DAF and in the whole endosperm at 20 DAF. Proteomic analysis with two-dimensional differential in-gel electrophoresis and mass spectrometry revealed 115 developmentally changed SGAPs, representing 37 unique proteins. 65% of the unique proteins had isoforms. 39% of the identified SGAPs were involved in starch biosynthesis with main functions in polyglucan elongation and granule structure trimming. Almost all proteins involved in starch biosynthesis, amino acid biosynthesis, glycolysis, protein folding, and PPDK pathways increased abundance as the endosperm developed, and were predicted in an interaction network. The network represents an important mechanism to orchestrate carbon partitioning among starch biosynthesis, amino acid biosynthesis and glycolysis for efficient starch and protein storage. These results provide novel insights into mechanisms of starch biosynthesis and its coordination with amino acid metabolisms and glycolysis in cereal endosperms.
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Affiliation(s)
- Huatao Yu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of SciencesBeijing, China
- Institute of Chinese Materia Medica, China Academy of Chinese Medical SciencesBeijing, China
| | - Tai Wang
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of SciencesBeijing, China
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20
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Schönhofen A, Hazard B, Zhang X, Dubcovsky J. Registration of Common Wheat Germplasm with Mutations in SBEII Genes Conferring Increased Grain Amylose and Resistant Starch Content. JOURNAL OF PLANT REGISTRATIONS 2016; 10:200-205. [PMID: 27818720 PMCID: PMC5091815 DOI: 10.3198/jpr2015.10.0066crg] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 02/12/2016] [Indexed: 05/03/2023]
Abstract
Starch present in the endosperm of common wheat (Triticum aestivum L.) grains is an important source of carbohydrates worldwide. Starches with a greater proportion of amylose have increased levels of resistant starch, a dietary fiber that can provide human health benefits. Induced mutations in STARCH BRANCHING ENZYME II (SBEII) genes in wheat are associated with increased amylose and resistant starch. Ethyl methane sulfonate mutations in SBEIIa and SBEIIb paralogs were combined in the hexaploid wheat cultivar Lassik. Four mutant combinations were generated: SBEIIa/b-AB (Reg. No. GP-997, PI 675644); SBEIIa/b-A, SBEIIa-D (Reg. No. GP-998, PI 675645); SBEIIa/b-B, SBEIIa-D (Reg. No. GP-999, PI 675646); and SBEIIa/b-AB, SBEIIa-D (Reg. No. GP-1000, PI 675647). The SBEII mutant lines were compared with a wild-type control in a greenhouse and field experiment. The quintuple mutant line (SBEIIa/b-AB, SBEIIa-D) presented significant increases in both amylose (51% greenhouse; 63% field) and resistant starch (947% greenhouse; 1057% field) relative to the control. A decrease in total starch content (7.8%) was observed in the field experiment. The quintuple mutant also differed in starch viscosity parameters. Registration of the hexaploid wheat SBEII-mutant lines by University of California, Davis can help expedite the development of common wheat cultivars with increased amylose and resistant starch content.
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Affiliation(s)
| | - Brittany Hazard
- Dep. of Plant Sciences, Univ. of California, Davis, CA 95616
| | - Xiaoqin Zhang
- Dep. of Plant Sciences, Univ. of California, Davis, CA 95616
| | - Jorge Dubcovsky
- Dep. of Plant Sciences, Univ. of California, Davis, CA 95616
- Howard Hughes Medical Institute, Chevy Chase, MD 20815
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21
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Genes involved in the accumulation of starch and lipids in wheat and rice: characterization using molecular and cytogenetic techniques. THE NUCLEUS 2015. [DOI: 10.1007/s13237-015-0149-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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22
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Regina A, Berbezy P, Kosar-Hashemi B, Li S, Cmiel M, Larroque O, Bird AR, Swain SM, Cavanagh C, Jobling SA, Li Z, Morell M. A genetic strategy generating wheat with very high amylose content. PLANT BIOTECHNOLOGY JOURNAL 2015; 13:1276-86. [PMID: 25644858 DOI: 10.1111/pbi.12345] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 12/22/2014] [Accepted: 12/22/2014] [Indexed: 05/20/2023]
Abstract
Resistant starch (RS), a type of dietary fibre, plays an important role in human health; however, the content of RS in most modern processed starchy foods is low. Cereal starch, when structurally manipulated through a modified starch biosynthetic pathway to greatly increase the amylose content, could be an important food source of RS. Transgenic studies have previously revealed the requirement of simultaneous down-regulation of two starch branching enzyme (SBE) II isoforms both located on the long arm of chromosome 2, namely SBEIIa and SBEIIb, to elevate the amylose content in wheat from ~25% to ~75%. The current study revealed close proximity of genes encoding SBEIIa and SBEIIb isoforms in wheat with a genetic distance of 0.5 cM on chromosome 2B. A series of deletion and single nucleotide polymorphism (SNP) loss of function alleles in SBEIIa, SBEIIb or both was isolated from two different wheat populations. A breeding strategy to combine deletions and SNPs generated wheat genotypes with altered expression levels of SBEIIa and SBEIIb, elevating the amylose content to an unprecedented ~85%, with a marked concomitant increase in RS content. Biochemical assays were used to confirm the complete absence in the grain of expression of SBEIIa from all three genomes in combination with the absence of SBEIIb from one of the genomes.
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Affiliation(s)
- Ahmed Regina
- CSIRO Agriculture Flagship, Canberra, ACT, Australia
| | - Pierre Berbezy
- Limagrain Cereales Ingredients, ZAC Les Portes de Riom, Riom Cedex, France
| | | | - Suzhi Li
- CSIRO Agriculture Flagship, Canberra, ACT, Australia
| | - Mark Cmiel
- CSIRO Agriculture Flagship, Canberra, ACT, Australia
| | | | - Anthony R Bird
- CSIRO Food and Nutrition Flagship, Adelaide, SA, Australia
| | - Steve M Swain
- CSIRO Agriculture Flagship, Canberra, ACT, Australia
| | | | | | - Zhongyi Li
- CSIRO Agriculture Flagship, Canberra, ACT, Australia
| | - Matthew Morell
- CSIRO Agriculture Flagship, Canberra, ACT, Australia
- International Rice Research Institute, Los Banos, Philippines
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23
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Singh A, Kumar P, Sharma M, Tuli R, Dhaliwal HS, Chaudhury A, Pal D, Roy J. Expression patterns of genes involved in starch biosynthesis during seed development in bread wheat (Triticum aestivum). MOLECULAR BREEDING 2015; 35:184. [DOI: 10.1007/s11032-015-0371-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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24
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Luo J, Ahmed R, Kosar-Hashemi B, Larroque O, Butardo VM, Tanner GJ, Colgrave ML, Upadhyaya NM, Tetlow IJ, Emes MJ, Millar A, Jobling SA, Morell MK, Li Z. The different effects of starch synthase IIa mutations or variation on endosperm amylose content of barley, wheat and rice are determined by the distribution of starch synthase I and starch branching enzyme IIb between the starch granule and amyloplast stroma. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2015; 128:1407-19. [PMID: 25893467 DOI: 10.1007/s00122-015-2515-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 04/03/2015] [Indexed: 05/26/2023]
Abstract
The distribution of starch synthase I and starch branching enzyme IIb between the starch granule and amyloplast stroma plays an important role in determining endosperm amylose content of cereal grains. Starch synthase IIa (SSIIa) catalyses the polymerisation of intermediate length glucan chains of amylopectin in the endosperm of cereals. Mutations of SSIIa genes in barley and wheat and inactive SSIIa variant in rice induce similar effects on the starch structure and the amylose content, but the severity of the phenotypes is different. This study compared the levels of transcripts and partitioning of proteins of starch synthase I (SSI) and starch branching enzyme IIb (SBEIIb) inside and outside the starch granules in the developing endosperms of these ssIIa mutants and inactive SSIIa variant. Pleiotropic effects on starch granule-bound proteins suggested that the different effects of SSIIa mutations on endosperm amylose content of barley, wheat and rice are determined by the distribution of SSI and SBEIIb between the starch granule and amyloplast stroma in cereals. Regulation of starch synthesis in ssIIa mutants and inactive SSIIa variant may be at post-translational level or the altered amylopectin structure deprives the affinity of SSI and SBEIIb to amylopectin.
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Affiliation(s)
- Jixun Luo
- CSIRO Agriculture Flagship, GPO Box 1600, Canberra, ACT, 2601, Australia
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25
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Ahmed Z, Tetlow IJ, Ahmed R, Morell MK, Emes MJ. Protein-protein interactions among enzymes of starch biosynthesis in high-amylose barley genotypes reveal differential roles of heteromeric enzyme complexes in the synthesis of A and B granules. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2015; 233:95-106. [PMID: 25711817 DOI: 10.1016/j.plantsci.2014.12.016] [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: 09/11/2014] [Revised: 11/10/2014] [Accepted: 12/20/2014] [Indexed: 05/23/2023]
Abstract
The present study investigated the role of protein phosphorylation, and protein complex formation between key enzymes of amylopectin synthesis, in barley genotypes exhibiting "high amylose" phenotypes. Starch branching enzyme (SBE) down-regulated lines (ΔSBEIIa and ΔSBEIIb), starch synthase (SS)IIa (ssiia(-), sex6) and SSIII (ssiii(-), amo1) mutants were compared to a reference genotype, OAC Baxter. Down-regulation of either SBEIIa or IIb caused pleiotropic effects on SSI and starch phosphorylase (SP) and resulted in formation of novel protein complexes in which the missing SBEII isoform was substituted by SBEI and SP. In the ΔSBEIIb down-regulated line, soluble SP activity was undetectable. Nonetheless, SP was incorporated into a heteromeric protein complex with SBEI and SBEIIa and was readily detected in starch granules. In amo1, unlike other mutants, the data suggest that both SBEIIa and SBEIIb are in a protein complex with SSI and SSIIa. In the sex6 mutant no protein complexes involving SBEIIa or SBEIIb were detected in amyloplasts. Studies with Pro-Q Diamond revealed that GBSS, SSI, SSIIa, SBEIIb and SP are phosphorylated in their granule bound state. Alteration in the granule proteome in ΔSBEIIa and ΔSBEIIb lines, suggests that different protein complexes are involved in the synthesis of A and B granules.
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Affiliation(s)
- Zaheer Ahmed
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
| | - Ian J Tetlow
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
| | - Regina Ahmed
- Food Futures National Research Flagship and Division of Plant Industry, CSIRO, Canberra ACT 2601, Australia.
| | | | - Michael J Emes
- Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
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Zhao Y, Li N, Li B, Li Z, Xie G, Zhang J. Reduced expression of starch branching enzyme IIa and IIb in maize endosperm by RNAi constructs greatly increases the amylose content in kernel with nearly normal morphology. PLANTA 2015; 241:449-61. [PMID: 25366555 DOI: 10.1007/s00425-014-2192-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2014] [Accepted: 10/16/2014] [Indexed: 05/18/2023]
Abstract
RNAi technology was applied to suppress the expression of starch branching enzyme IIa and IIb and to increase amylose content in maize endosperm, and stably inherited high-amylose maize lines were obtained. Amylose is an important material for industries and in the human diet. Maize varieties with endosperm amylose content (AC) of greater than 50 % are termed amylomaize, and possess high industrial application value. The high-amylose trait is controlled by multi-enzyme reaction and intricate gene-environment interaction. Starch branching enzymes are key factors for regulating the branching profiles of starches. In this paper, we report the successful application of RNAi technology for improving amylose content in maize endosperm through the suppression of the ZmSBEIIa and ZmSBEIIb genes by hairpin SBEIIRNAi constructs. These SBEIIRNAi transgenes led to the down-regulation of ZmSBEII expression and SBE activity to various degrees and altered the morphology of starch granules. Transgenic maize lines with AC of up to 55.89 % were produced, which avoided the significant decreases in starch content and grain yield that occur in high-amylose ae mutant. Novel maize lines with high AC offer potential benefits for high-amylose maize breeding. A comparison of gene silencing efficiency among transgenic lines containing different hpSBEIIRNA constructs demonstrated that (1) it was more efficient to use both ZmSBEIIa and ZmSBEIIb specific regions than to use the conserved domain as the inverted repeat arms; (2) the endosperm-specific promoter of the 27-kDa γ-zein provided more efficient inhibition than the CaMV 35S promoter; and (3) inclusion of the catalase intron in the hpSBEIIRNA constructs provided a better silencing effect than the chalcone synthase intron in the hpRNA construct design for suppression of the SBEII subfamily in endosperm.
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Affiliation(s)
- Yajie Zhao
- School of Life Science, Shandong University, 27 Shanda South Road, Jinan, 250100, People's Republic of China
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27
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Cornejo-Ramírez YI, Cinco-Moroyoqui FJ, Ramírez-Reyes F, Rosas-Burgos EC, Osuna-Amarillas PS, Wong-Corral FJ, Borboa-Flores J, Cota-Gastélum AG. Physicochemical characterization of starch from hexaploid triticale (X TriticosecaleWittmack) genotypes. CYTA - JOURNAL OF FOOD 2015. [DOI: 10.1080/19476337.2014.994565] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Tetlow IJ, Emes MJ. A review of starch-branching enzymes and their role in amylopectin biosynthesis. IUBMB Life 2014; 66:546-58. [PMID: 25196474 DOI: 10.1002/iub.1297] [Citation(s) in RCA: 111] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 07/31/2014] [Accepted: 08/07/2014] [Indexed: 11/07/2022]
Abstract
Starch-branching enzymes (SBEs) are one of the four major enzyme classes involved in starch biosynthesis in plants and algae, and their activities play a crucial role in determining the structure and physical properties of starch granules. SBEs generate α-1,6-branch linkages in α-glucans through cleavage of internal α-1,4 bonds and transfer of the released reducing ends to C-6 hydroxyls. Starch biosynthesis in plants and algae requires multiple isoforms of SBEs and is distinct from glycogen biosynthesis in both prokaryotes and eukaryotes which uses a single branching enzyme (BE) isoform. One of the unique characteristics of starch structure is the grouping of α-1,6-branch points in clusters within amylopectin. This is a feature of SBEs and their interplay with other starch biosynthetic enzymes, thus facilitating formation of the compact water-insoluble semicrystalline starch granule. In this respect, the activity of SBE isoforms is pivotal in starch granule assembly. SBEs are structurally related to the α-amylase superfamily of enzymes, sharing three domains of secondary structure with prokaryotic Bes: the central (β/α)8 -barrel catalytic domain, an NH2 -terminal domain involved in determining the size of α-glucan chain transferred, and the C-terminal domain responsible for catalytic capacity and substrate preference. In addition, SBEs have conserved plant-specific domains, including phosphorylation sites which are thought to be involved in regulating starch metabolism. SBEs form heteromeric protein complexes with other SBE isoforms as well as other enzymes involved in starch synthesis, and assembly of these protein complexes is regulated by protein phosphorylation. Phosphorylated SBEIIb is found in multienzyme complexes with isoforms of glucan-elongating starch synthases, and these protein complexes are implicated in amylopectin cluster formation. This review presents a comparative overview of plant SBEs and includes a review of their properties, structural and functional characteristics, and recent developments on their post-translational regulation.
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Affiliation(s)
- Ian J Tetlow
- Department of Molecular and Cellular Biology, Science Complex, University of Guelph, Guelph, ON, Canada
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30
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Comparative proteome analysis of A- and B-type starch granule-associated proteins in bread wheat (Triticum aestivum L.) and Aegilops crassa. J Proteomics 2014; 112:95-112. [PMID: 25154053 DOI: 10.1016/j.jprot.2014.08.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 07/27/2014] [Accepted: 08/05/2014] [Indexed: 11/23/2022]
Abstract
UNLABELLED Starch is the main component in the wheat endosperm and exists in two forms including A- and B-type granules. A bread wheat line CB037A and an Aegilops line Aegilops crassa were studied for the underlying starch biosynthesis mechanism in relation to granule types. The wheat line contains both types of starch granules while the Aegilops line only has the A-type. Differential starch granule development patterns of these two species were observed at the morphological level. A total of 190 differentially expressed proteins (DEPs) were detected between the two lines based on 2-D electrophoresis, among which 119 DEPs were identified, representing 13 unique proteins. Gene ontology annotation analysis indicated that both molecular functions and biological processes of the identified proteins are highly conserved. Different phosphorylation modification levels between the A- and B-type starch granules were found. Real-time quantitative reverse transcription PCR analysis revealed that a number of key genes including starch synthase I-1, pullulanase, isoamylase and starch branching enzyme IIa were differentially expressed between the two species. Our results demonstrated that the large granule size is associated with higher activities of multiple starch biosynthesis enzymes. The phosphorylation of starch biosynthesis enzymes is related with the formation of B-type starch granules. BIOLOGICAL SIGNIFICANCE Analyzed the proteome, transcriptome and phosphorylation of core starch granule biosynthesis enzymes and provided new insights into the differential mechanisms underlying the A- and B-type starch granule biosyntheses.
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Makhmoudova A, Williams D, Brewer D, Massey S, Patterson J, Silva A, Vassall KA, Liu F, Subedi S, Harauz G, Siu KWM, Tetlow IJ, Emes MJ. Identification of multiple phosphorylation sites on maize endosperm starch branching enzyme IIb, a key enzyme in amylopectin biosynthesis. J Biol Chem 2014; 289:9233-46. [PMID: 24550386 DOI: 10.1074/jbc.m114.551093] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Starch branching enzyme IIb (SBEIIb) plays a crucial role in amylopectin biosynthesis in maize endosperm by defining the structural and functional properties of storage starch and is regulated by protein phosphorylation. Native and recombinant maize SBEIIb were used as substrates for amyloplast protein kinases to identify phosphorylation sites on the protein. A multidisciplinary approach involving bioinformatics, site-directed mutagenesis, and mass spectrometry identified three phosphorylation sites at Ser residues: Ser(649), Ser(286), and Ser(297). Two Ca(2+)-dependent protein kinase activities were partially purified from amyloplasts, termed K1, responsible for Ser(649) and Ser(286) phosphorylation, and K2, responsible for Ser(649) and Ser(297) phosphorylation. The Ser(286) and Ser(297) phosphorylation sites are conserved in all plant branching enzymes and are located at opposite openings of the 8-stranded parallel β-barrel of the active site, which is involved with substrate binding and catalysis. Molecular dynamics simulation analysis indicates that phospho-Ser(297) forms a stable salt bridge with Arg(665), part of a conserved Cys-containing domain in plant branching enzymes. Ser(649) conservation appears confined to the enzyme in cereals and is not universal, and is presumably associated with functions specific to seed storage. The implications of SBEIIb phosphorylation are considered in terms of the role of the enzyme and the importance of starch biosynthesis for yield and biotechnological application.
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Affiliation(s)
- Amina Makhmoudova
- From the Department of Molecular and Cellular Biology, College of Biological Science
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32
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Busi MV, Gomez-Casati DF, Martín M, Barchiesi J, Grisolía MJ, Hedín N, Carrillo JB. Starch Metabolism in Green Plants. POLYSACCHARIDES 2014. [DOI: 10.1007/978-3-319-03751-6_78-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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33
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Polymorphism of Starch Granule-Associated Proteins and 5′ Leader Sequence of GBSSI Gene in Indigenous Naked Barley ( Hordeum vulgare L.) from Qinghai-Tibetan Plateau in China. ACTA AGRONOMICA SINICA 2013. [DOI: 10.3724/sp.j.1006.2012.01148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Butardo VM, Daygon VD, Colgrave ML, Campbell PM, Resurreccion A, Cuevas RP, Jobling SA, Tetlow I, Rahman S, Morell M, Fitzgerald M. Biomolecular analyses of starch and starch granule proteins in the high-amylose rice mutant Goami 2. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:11576-85. [PMID: 23009566 DOI: 10.1021/jf303205p] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Elevated proportions of amylose in cereals are commonly associated with either the loss of starch branching or starch synthase activity. Goami 2 is a high-amylose mutant of the temperate japonica rice variety Ilpumbyeo. Genotyping revealed that Goami 2 and Ilpumbyeo carry the same alleles for starch synthase IIa and granule-bound starch synthase I genes. Analyses of granule-bound proteins revealed that SSI and SSIIa accumulate inside the mature starch granules of Goami 2, which is similar to the amylose extender mutant IR36ae. However, unlike the amylose extender mutants, SBEIIb was still detectable inside the starch granules of Goami 2. Detection of SBEIIb after protein fractionation revealed that most of the SBEIIb in Goami 2 accumulates inside the starch granules, whereas most of it accumulates at the granule surface in Ilpumbyeo. Exhaustive mass spectrometric characterisations of granule-bound proteins failed to detect any peptide sequence mutation or major post-translational modifications in Goami 2. Moreover, the signal peptide was found to be cleaved normally from the precursor protein, and there is no apparent N-linked glycosylation. Finally, no difference was found in the SBEIIb structural gene sequence of Goami 2 compared with Ilpumbyeo. In contrast, a G-to-A mutation was detected in the SBEIIb gene of IR36ae located at the splice site between exon and intron 11, which could potentially introduce a premature stop codon and produce a truncated form of SBEIIb. It is suggested that the mutation responsible for producing high amylose in Goami 2 is not due to a defect in SBEIIb gene as was observed in IR36ae, even though it produces a phenotype analogous to the amylose extender mutation. Understanding the molecular genetic basis of this mutation will be important in identifying novel targets for increasing amylose and resistant starch contents in rice and other cereals.
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Affiliation(s)
- Vito M Butardo
- Grain Quality, Nutrition, and Postharvest Centre, International Rice Research Institute (IRRI), DAPO 7777 Metro Manila, The Philippines.
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35
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He JF, Goyal R, Laroche A, Zhao ML, Lu ZX. Water stress during grain development affects starch synthesis, composition and physicochemical properties in triticale. J Cereal Sci 2012. [DOI: 10.1016/j.jcs.2012.07.011] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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36
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Hazard B, Zhang X, Colasuonno P, Uauy C, Beckles DM, Dubcovsky J. Induced mutations in the starch branching enzyme II ( SBEII) genes increase amylose and resistant starch content in durum wheat. CROP SCIENCE 2012; 52:1754-1766. [PMID: 26924849 PMCID: PMC4768815 DOI: 10.2135/cropsci2012.02.0126] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Starch is the largest component of the wheat (Triticum aestivum L.) grain and consists of approximately 70-80% amylopectin and 20-30% amylose. Amylopectin is a highly-branched, readily digested polysaccharide, whereas amylose has few branches and forms complexes that resist digestion and mimic dietary fiber (resistant starch). Down-regulation of the starch branching enzyme II (SBEII) gene by RNA interference (RNAi) was previously shown to increase amylose content in both hexaploid and tetraploid wheat. We generated ethyl methane sulphonate (EMS) mutants for the SBEIIa-A and SBEIIa-B homoeologs in the tetraploid durum wheat variety Kronos (T. turgidum ssp. durum L.). Single-gene mutants showed non-significant increases in amylose and resistant starch content, but a double mutant combining a SBEIIa-A knock-out mutation with a SBEIIa-B splice-site mutation showed a 22% increase in amylose content (P<0.0001) and a 115% increase in resistant starch content (P<0.0001). In addition, we obtained mutants for the A and B genome copies of the paralogous SBEIIb gene, mapped them 1-2 cM from SBEIIa, and generated double SBEIIa-SBEIIb mutants to study the effect of the SBEIIb gene in the absence of SBEIIa. These mutants are available to those interested in increasing amylose content and resistant starch in durum wheat.
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Affiliation(s)
- Brittany Hazard
- Dept. of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Xiaoqin Zhang
- Dept. of Plant Sciences, University of California, Davis, CA 95616, USA
| | | | - Cristobal Uauy
- Dept. of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Diane M. Beckles
- Dept. of Plant Sciences, University of California, Davis, CA 95616, USA
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37
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Slade AJ, McGuire C, Loeffler D, Mullenberg J, Skinner W, Fazio G, Holm A, Brandt KM, Steine MN, Goodstal JF, Knauf VC. Development of high amylose wheat through TILLING. BMC PLANT BIOLOGY 2012; 12:69. [PMID: 22584013 PMCID: PMC3424102 DOI: 10.1186/1471-2229-12-69] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Accepted: 05/14/2012] [Indexed: 05/19/2023]
Abstract
BACKGROUND Wheat (Triticum spp.) is an important source of food worldwide and the focus of considerable efforts to identify new combinations of genetic diversity for crop improvement. In particular, wheat starch composition is a major target for changes that could benefit human health. Starches with increased levels of amylose are of interest because of the correlation between higher amylose content and elevated levels of resistant starch, which has been shown to have beneficial effects on health for combating obesity and diabetes. TILLING (Targeting Induced Local Lesions in Genomes) is a means to identify novel genetic variation without the need for direct selection of phenotypes. RESULTS Using TILLING to identify novel genetic variation in each of the A and B genomes in tetraploid durum wheat and the A, B and D genomes in hexaploid bread wheat, we have identified mutations in the form of single nucleotide polymorphisms (SNPs) in starch branching enzyme IIa genes (SBEIIa). Combining these new alleles of SBEIIa through breeding resulted in the development of high amylose durum and bread wheat varieties containing 47-55% amylose and having elevated resistant starch levels compared to wild-type wheat. High amylose lines also had reduced expression of SBEIIa RNA, changes in starch granule morphology and altered starch granule protein profiles as evaluated by mass spectrometry. CONCLUSIONS We report the use of TILLING to develop new traits in crops with complex genomes without the use of transgenic modifications. Combined mutations in SBEIIa in durum and bread wheat varieties resulted in lines with significantly increased amylose and resistant starch contents.
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Affiliation(s)
- Ann J Slade
- Arcadia Biosciences, Inc, 410 West Harrison St, Suite 150, Seattle, WA, 98119, USA
| | - Cate McGuire
- Arcadia Biosciences, Inc, 202 Cousteau Pl, Suite 200, Davis, CA, 95618, USA
| | - Dayna Loeffler
- Arcadia Biosciences, Inc, 410 West Harrison St, Suite 150, Seattle, WA, 98119, USA
| | - Jessica Mullenberg
- Arcadia Biosciences, Inc, 410 West Harrison St, Suite 150, Seattle, WA, 98119, USA
| | - Wayne Skinner
- Arcadia Biosciences, Inc, 202 Cousteau Pl, Suite 200, Davis, CA, 95618, USA
| | - Gia Fazio
- Arcadia Biosciences, Inc, 202 Cousteau Pl, Suite 200, Davis, CA, 95618, USA
| | - Aaron Holm
- Arcadia Biosciences, Inc, 410 West Harrison St, Suite 150, Seattle, WA, 98119, USA
| | - Kali M Brandt
- Arcadia Biosciences, Inc, 410 West Harrison St, Suite 150, Seattle, WA, 98119, USA
| | - Michael N Steine
- Arcadia Biosciences, Inc, 410 West Harrison St, Suite 150, Seattle, WA, 98119, USA
| | - John F Goodstal
- Arcadia Biosciences, Inc, 202 Cousteau Pl, Suite 200, Davis, CA, 95618, USA
| | - Vic C Knauf
- Arcadia Biosciences, Inc, 410 West Harrison St, Suite 150, Seattle, WA, 98119, USA
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38
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Regina A, Blazek J, Gilbert E, Flanagan BM, Gidley MJ, Cavanagh C, Ral JP, Larroque O, Bird AR, Li Z, Morell MK. Differential effects of genetically distinct mechanisms of elevating amylose on barley starch characteristics. Carbohydr Polym 2012; 89:979-91. [PMID: 24750889 DOI: 10.1016/j.carbpol.2012.04.054] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Revised: 04/11/2012] [Accepted: 04/12/2012] [Indexed: 11/25/2022]
Abstract
The relationships between starch structure and functionality are important in underpinning the industrial and nutritional utilisation of starches. In this work, the relationships between the biosynthesis, structure, molecular organisation and functionality have been examined using a series of defined genotypes in barley with low (<20%), standard (20-30%), elevated (30-50%) and high (>50%) amylose starches. A range of techniques have been employed to determine starch physical features, higher order structure and functionality. The two genetic mechanisms for generating high amylose contents (down-regulation of branching enzymes and starch synthases, respectively) yielded starches with very different amylopectin structures but similar gelatinisation and viscosity properties driven by reduced granular order and increased amylose content. Principal components analysis (PCA) was used to elucidate the relationships between genotypes and starch molecular structure and functionality. Parameters associated with granule order (PC1) accounted for a large percentage of the variance (57%) and were closely related to amylose content. Parameters associated with amylopectin fine structure accounted for 18% of the variance but were less closely aligned to functionality parameters.
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Affiliation(s)
- Ahmed Regina
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Jaroslav Blazek
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - Elliot Gilbert
- Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - Bernadine M Flanagan
- Centre for Nutrition and Food Sciences, University of Queensland, St. Lucia, Qld 4072, Australia
| | - Michael J Gidley
- Centre for Nutrition and Food Sciences, University of Queensland, St. Lucia, Qld 4072, Australia
| | - Colin Cavanagh
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Jean-Philippe Ral
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Oscar Larroque
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Anthony R Bird
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Food and Nutritional Sciences, Kintore Avenue, Adelaide, SA, Australia
| | - Zhongyi Li
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Matthew K Morell
- CSIRO Food Futures National Research Flagship, GPO Box 1600, Canberra, ACT 2601, Australia; CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
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Botticella E, Sestili F, Hernandez-Lopez A, Phillips A, Lafiandra D. High resolution melting analysis for the detection of EMS induced mutations in wheat SBEIIa genes. BMC PLANT BIOLOGY 2011; 11:156. [PMID: 22074448 PMCID: PMC3228712 DOI: 10.1186/1471-2229-11-156] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Accepted: 11/10/2011] [Indexed: 05/20/2023]
Abstract
BACKGROUND Manipulation of the amylose-amylopectin ratio in cereal starch has been identified as a major target for the production of starches with novel functional properties. In wheat, silencing of starch branching enzyme genes by a transgenic approach reportedly caused an increase of amylose content up to 70% of total starch, exhibiting novel and interesting nutritional characteristics. In this work, the functionality of starch branching enzyme IIa (SBEIIa) has been targeted in bread wheat by TILLING. An EMS-mutagenised wheat population has been screened using High Resolution Melting of PCR products to identify functional SNPs in the three homoeologous genes encoding the target enzyme in the hexaploid genome. RESULTS This analysis resulted in the identification of 56, 14 and 53 new allelic variants respectively for SBEIIa-A, SBEIIa-B and SBEIIa-D. The effects of the mutations on protein structure and functionality were evaluated by a bioinformatic approach. Two putative null alleles containing non-sense or splice site mutations were identified for each of the three homoeologous SBEIIa genes; qRT-PCR analysis showed a significant decrease of their gene expression and resulted in increased amylose content. Pyramiding of different single null homoeologous allowed to isolate double null mutants showing an increase of amylose content up to 21% compared to the control. CONCLUSION TILLING has successfully been used to generate novel alleles for SBEIIa genes known to control amylose content in wheat. Single and double null SBEIIa genotypes have been found to show a significant increase in amylose content.
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Affiliation(s)
- Ermelinda Botticella
- Department of Agriculture, Forests, Nature and Energy, University of Tuscia, 01100 Viterbo, Italy
| | - Francesco Sestili
- Department of Agriculture, Forests, Nature and Energy, University of Tuscia, 01100 Viterbo, Italy
| | | | - Andrew Phillips
- Plant Science Department, Rothamsted Research, Harpenden, AL5 2JQ, UK
| | - Domenico Lafiandra
- Department of Agriculture, Forests, Nature and Energy, University of Tuscia, 01100 Viterbo, Italy
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Butardo VM, Fitzgerald MA, Bird AR, Gidley MJ, Flanagan BM, Larroque O, Resurreccion AP, Laidlaw HKC, Jobling SA, Morell MK, Rahman S. Impact of down-regulation of starch branching enzyme IIb in rice by artificial microRNA- and hairpin RNA-mediated RNA silencing. JOURNAL OF EXPERIMENTAL BOTANY 2011; 62:4927-41. [PMID: 21791436 PMCID: PMC3193005 DOI: 10.1093/jxb/err188] [Citation(s) in RCA: 150] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2011] [Revised: 05/10/2011] [Accepted: 05/13/2011] [Indexed: 05/19/2023]
Abstract
The inactivation of starch branching IIb (SBEIIb) in rice is traditionally associated with elevated apparent amylose content, increased peak gelatinization temperature, and a decreased proportion of short amylopectin branches. To elucidate further the structural and functional role of this enzyme, the phenotypic effects of down-regulating SBEIIb expression in rice endosperm were characterized by artificial microRNA (amiRNA) and hairpin RNA (hp-RNA) gene silencing. The results showed that RNA silencing of SBEIIb expression in rice grains did not affect the expression of other major isoforms of starch branching enzymes or starch synthases. Structural analyses of debranched starch showed that the doubling of apparent amylose content was not due to an increase in the relative proportion of amylose chains but instead was due to significantly elevated levels of long amylopectin and intermediate chains. Rices altered by the amiRNA technique produced a more extreme starch phenotype than those modified using the hp-RNA technique, with a greater increase in the proportion of long amylopectin and intermediate chains. The more pronounced starch structural modifications produced in the amiRNA lines led to more severe alterations in starch granule morphology and crystallinity as well as digestibility of freshly cooked grains. The potential role of attenuating SBEIIb expression in generating starch with elevated levels of resistant starch and lower glycaemic index is discussed.
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Affiliation(s)
- Vito M. Butardo
- CSIRO Food Futures Flagship, GPO Box 93, North Ryde, NSW 1670, Australia
- CSIRO Plant Industry, GPO Box 1600, ACT 2601, Australia
- Grain Quality and Nutrition Centre, International Rice Research Institute, Los Baños, Laguna 4031, Philippines
- Centre for Nutrition and Food Sciences, University of Queensland, Brisbane, Qld 4072, Australia
| | - Melissa A. Fitzgerald
- Grain Quality and Nutrition Centre, International Rice Research Institute, Los Baños, Laguna 4031, Philippines
| | - Anthony R. Bird
- CSIRO Food Futures Flagship, GPO Box 93, North Ryde, NSW 1670, Australia
- CSIRO Food and Nutritional Sciences, PO Box 10041, Adelaide SA 5000, Australia
| | - Michael J. Gidley
- Centre for Nutrition and Food Sciences, University of Queensland, Brisbane, Qld 4072, Australia
| | - Bernadine M. Flanagan
- Centre for Nutrition and Food Sciences, University of Queensland, Brisbane, Qld 4072, Australia
| | - Oscar Larroque
- CSIRO Food Futures Flagship, GPO Box 93, North Ryde, NSW 1670, Australia
- CSIRO Plant Industry, GPO Box 1600, ACT 2601, Australia
| | - Adoracion P. Resurreccion
- Grain Quality and Nutrition Centre, International Rice Research Institute, Los Baños, Laguna 4031, Philippines
| | - Hunter K. C. Laidlaw
- CSIRO Food Futures Flagship, GPO Box 93, North Ryde, NSW 1670, Australia
- CSIRO Plant Industry, GPO Box 1600, ACT 2601, Australia
| | - Stephen A. Jobling
- CSIRO Food Futures Flagship, GPO Box 93, North Ryde, NSW 1670, Australia
- CSIRO Plant Industry, GPO Box 1600, ACT 2601, Australia
| | - Matthew K. Morell
- CSIRO Food Futures Flagship, GPO Box 93, North Ryde, NSW 1670, Australia
- CSIRO Plant Industry, GPO Box 1600, ACT 2601, Australia
| | - Sadequr Rahman
- CSIRO Food Futures Flagship, GPO Box 93, North Ryde, NSW 1670, Australia
- CSIRO Plant Industry, GPO Box 1600, ACT 2601, Australia
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Wang Z, Li W, Qi J, Shi P, Yin Y. Starch accumulation, activities of key enzyme and gene expression in starch synthesis of wheat endosperm with different starch contents. Journal of Food Science and Technology 2011; 51:419-29. [PMID: 24587516 DOI: 10.1007/s13197-011-0520-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 08/11/2011] [Accepted: 08/26/2011] [Indexed: 12/01/2022]
Abstract
In order to investigate starch accumulation, and the enzymes activity changes and the expression levels of genes and their relationships among them at different developmental stages of wheat grain. We choose Annong9912 and E28 were used in the study. During starch accumulating rate and grain filling rate, and there were obvious genotype difference between Annong9912 and E28. Whether low or high starch content of starch content, the accumulation courses of amylopectin, amylose and total starch were well fitted to the logistic equation by relating starch contents against DAP. The simulation parameters revealed that the higher contents of amylopectin and amylose resulted from earlier initiating accumulation time and greater accumulation rate. And amylose, amylopectin and total starch accumulation rate of two wheat cultures were significantly and positively correlated with activities of SBE, SSS and GBSS, but amylose accumulation rate of E28 had no correlation with the activities of SBE. In addition, there were significant correlations among activities of SBE, SSS and GBSS in two wheat cultivars. We speculated that these enzymes proteins may have a coordinating action in starch biosynthesis within the amyloplast, operating as functional multiprotein complexes. And expression levels of enzyme genes demonstrated a single-peak curve, and 12-18 DAP reached their peaks and then began to drop, and all had high expression level in earlier stage of endosperm development, but in E28 were higher than in Annong9912. The GBSS-I transcripts on average were expressed over 60 times more than GBSS-II transcript in E28. SBE, SSS, DBE may control starch synthesis at the transcriptional level, and GBSS-I may control starch synthesis at the post transcriptional level. The expression level of DBE on average was lower than SS-1 and SBE-IIa genes, and similar to SS-III and SBE-IIb genes, but higher than GBSS-I and GBSS-II genes.
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Affiliation(s)
- Zibu Wang
- School of Agronomy, Shihezi University, Shihezi, 832 003 China
| | - Weihua Li
- School of Agronomy, Shihezi University, Shihezi, 832 003 China
| | - Juncang Qi
- School of Agronomy, Shihezi University, Shihezi, 832 003 China
| | - Peichun Shi
- School of Agronomy, Shihezi University, Shihezi, 832 003 China
| | - Yongan Yin
- School of Agronomy, Shihezi University, Shihezi, 832 003 China
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Wang CP, Pan ZF, Nima ZX, Tang YW, Cai P, Liang JJ, Deng GB, Long H, Yu MQ. Starch granule-associated proteins of hull-less barley (Hordeum vulgare L.) from the Qinghai-Tibet Plateau in China. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2011; 91:616-24. [PMID: 21213217 DOI: 10.1002/jsfa.4223] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Revised: 10/18/2010] [Accepted: 10/18/2010] [Indexed: 05/10/2023]
Abstract
BACKGROUND The starch granule-associated proteins (SGAPs) are the minor components of the starch granules and a majority of them are believed to be starch biosynthetic enzymes. The Qinghai-Tibet Plateau in China, one of the centres of origin of cultivated barley, is abundant in hull-less barley resources which exhibit high polymorphism in SGAPs. RESULTS The SGAPs of hull-less barley from Qinghai-Tibet Plateau were analysed by one-dimensional (1-D) SDS-PAGE, 2-D PAGE and ESI-Q-TOF MS/MS. In the 1-D SDS-PAGE gel, four proteins including a 80 kDa starch synthase, actin, actin 4 and ATP synthase β-subunit were identified as novel SGAPs. A total of six different bands were identified as starch granule-bound starch synthase I (GBSSI) and the segregation of the novel GBSSI bands in F(1) and F(2) seeds derived from yf127 × yf70 was in accordance with Mendel's law. In the 2-D PAGE gel, 92 spots were identified as 42 protein species which could be classified into 15 functional groups. Thirteen protein species were identified as SGAPs for the first time and multiple spots were identified as GBSSI. CONCLUSION This study revealed novel SGAPs in hull-less barley from the Qinghai-Tibet Plateau in China and these will be significant in further studies of starch biosynthesis in barley.
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Affiliation(s)
- Chun-Ping Wang
- Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9 Section 4, Renmin South Road, Chengdu 610041, People's Republic of China
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Sestili F, Janni M, Doherty A, Botticella E, D'Ovidio R, Masci S, Jones HD, Lafiandra D. Increasing the amylose content of durum wheat through silencing of the SBEIIa genes. BMC PLANT BIOLOGY 2010; 10:144. [PMID: 20626919 PMCID: PMC3095290 DOI: 10.1186/1471-2229-10-144] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Accepted: 07/14/2010] [Indexed: 05/18/2023]
Abstract
BACKGROUND High amylose starch has attracted particular interest because of its correlation with the amount of Resistant Starch (RS) in food. RS plays a role similar to fibre with beneficial effects for human health, providing protection from several diseases such as colon cancer, diabetes, obesity, osteoporosis and cardiovascular diseases. Amylose content can be modified by a targeted manipulation of the starch biosynthetic pathway. In particular, the inactivation of the enzymes involved in amylopectin synthesis can lead to the increase of amylose content. In this work, genes encoding starch branching enzymes of class II (SBEIIa) were silenced using the RNA interference (RNAi) technique in two cultivars of durum wheat, using two different methods of transformation (biolistic and Agrobacterium). Expression of RNAi transcripts was targeted to the seed endosperm using a tissue-specific promoter. RESULTS Amylose content was markedly increased in the durum wheat transgenic lines exhibiting SBEIIa gene silencing. Moreover the starch granules in these lines were deformed, possessing an irregular and deflated shape and being smaller than those present in the untransformed controls. Two novel granule bound proteins, identified by SDS-PAGE in SBEIIa RNAi lines, were investigated by mass spectrometry and shown to have strong homologies to the waxy proteins. RVA analysis showed new pasting properties associated with high amylose lines in comparison with untransformed controls. Finally, pleiotropic effects on other starch genes were found by semi-quantitative and Real-Time reverse transcription-polymerase chain reaction (RT-PCR). CONCLUSION We have found that the silencing of SBEIIa genes in durum wheat causes obvious alterations in granule morphology and starch composition, leading to high amylose wheat. Results obtained with two different methods of transformation and in two durum wheat cultivars were comparable.
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Affiliation(s)
- Francesco Sestili
- University of Tuscia, Department of Agrobiology & Agrochemistry, Viterbo, Italy
| | - Michela Janni
- University of Tuscia, Department of Agrobiology & Agrochemistry, Viterbo, Italy
| | - Angela Doherty
- Rothamsted Research, Department of Plant Science, Harpenden, UK
| | | | - Renato D'Ovidio
- University of Tuscia, Department of Agrobiology & Agrochemistry, Viterbo, Italy
| | - Stefania Masci
- University of Tuscia, Department of Agrobiology & Agrochemistry, Viterbo, Italy
| | - Huw D Jones
- Rothamsted Research, Department of Plant Science, Harpenden, UK
| | - Domenico Lafiandra
- University of Tuscia, Department of Agrobiology & Agrochemistry, Viterbo, Italy
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Bancel E, Rogniaux H, Debiton C, Chambon C, Branlard G. Extraction and Proteome Analysis of Starch Granule-Associated Proteins in Mature Wheat Kernel (Triticum aestivum L.). J Proteome Res 2010; 9:3299-310. [DOI: 10.1021/pr9010525] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Emmanuelle Bancel
- INRA UMR 1095 GDEC, 234 Avenue du Brézet, 63100 Clermont-Ferrand, France, INRA UR 1268 BIA, BISB Platform, Rue de la Géraudière, 44316 Nantes cedex 3, France, and INRA UR 370 PFEM-Plateau Protéomique, 63122 Saint-Genès-Champanelle, France
| | - Hélène Rogniaux
- INRA UMR 1095 GDEC, 234 Avenue du Brézet, 63100 Clermont-Ferrand, France, INRA UR 1268 BIA, BISB Platform, Rue de la Géraudière, 44316 Nantes cedex 3, France, and INRA UR 370 PFEM-Plateau Protéomique, 63122 Saint-Genès-Champanelle, France
| | - Clément Debiton
- INRA UMR 1095 GDEC, 234 Avenue du Brézet, 63100 Clermont-Ferrand, France, INRA UR 1268 BIA, BISB Platform, Rue de la Géraudière, 44316 Nantes cedex 3, France, and INRA UR 370 PFEM-Plateau Protéomique, 63122 Saint-Genès-Champanelle, France
| | - Christophe Chambon
- INRA UMR 1095 GDEC, 234 Avenue du Brézet, 63100 Clermont-Ferrand, France, INRA UR 1268 BIA, BISB Platform, Rue de la Géraudière, 44316 Nantes cedex 3, France, and INRA UR 370 PFEM-Plateau Protéomique, 63122 Saint-Genès-Champanelle, France
| | - Gérard Branlard
- INRA UMR 1095 GDEC, 234 Avenue du Brézet, 63100 Clermont-Ferrand, France, INRA UR 1268 BIA, BISB Platform, Rue de la Géraudière, 44316 Nantes cedex 3, France, and INRA UR 370 PFEM-Plateau Protéomique, 63122 Saint-Genès-Champanelle, France
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Regina A, Kosar-Hashemi B, Ling S, Li Z, Rahman S, Morell M. Control of starch branching in barley defined through differential RNAi suppression of starch branching enzyme IIa and IIb. JOURNAL OF EXPERIMENTAL BOTANY 2010; 61:1469-82. [PMID: 20156842 PMCID: PMC2837261 DOI: 10.1093/jxb/erq011] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2009] [Revised: 01/13/2010] [Accepted: 01/14/2010] [Indexed: 05/20/2023]
Abstract
The roles of starch branching enzyme (SBE, EC 2.4.1.18) IIa and SBE IIb in defining the structure of amylose and amylopectin in barley (Hordeum vulgare) endosperm were examined. Barley lines with low expression of SBE IIa or SBE IIb, and with the low expression of both isoforms were generated through RNA-mediated silencing technology. These lines enabled the study of the role of each of these isoforms in determining the amylose content, the distribution of chain lengths, and the frequency of branching in both amylose and amylopectin. In lines where both SBE IIa and SBE IIb expression were reduced by >80%, a high amylose phenotype (>70%) was observed, while a reduction in the expression of either of these isoforms alone had minor impact on amylose content. The structure and properties of the high amylose starch resulting from the concomitant reduction in the expression of both isoforms of SBE II in barley were found to approximate changes seen in amylose extender mutants of maize, which result from lesions eliminating expression of the SBE IIb gene. Amylopectin chain length distribution analysis indicated that both SBE IIa and SBE IIb isoforms play distinct roles in determining the fine structure of amylopectin. A significant reduction in the frequency of branches in amylopectin was noticed only when both SBE IIa and SBE IIb were reduced, whereas there was a significant increase in the branching frequency of amylose when SBE IIb alone was reduced. Functional interactions between SBE isoforms are suggested, and a possible inhibitory role of SBE IIb on other SBE isoforms is discussed.
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Affiliation(s)
- Ahmed Regina
- Commonwealth Scientific and Industrial Research Organization, Food Futures National Research Flagship, PO Box 93, North Ryde 1670, NSW, Australia
- Commonwealth Scientific and Industrial Research Organization, Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia
| | - Behjat Kosar-Hashemi
- Commonwealth Scientific and Industrial Research Organization, Food Futures National Research Flagship, PO Box 93, North Ryde 1670, NSW, Australia
- Commonwealth Scientific and Industrial Research Organization, Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia
| | - Samuel Ling
- Commonwealth Scientific and Industrial Research Organization, Food Futures National Research Flagship, PO Box 93, North Ryde 1670, NSW, Australia
| | - Zhongyi Li
- Commonwealth Scientific and Industrial Research Organization, Food Futures National Research Flagship, PO Box 93, North Ryde 1670, NSW, Australia
- Commonwealth Scientific and Industrial Research Organization, Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia
| | - Sadequr Rahman
- Commonwealth Scientific and Industrial Research Organization, Food Futures National Research Flagship, PO Box 93, North Ryde 1670, NSW, Australia
- Commonwealth Scientific and Industrial Research Organization, Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia
| | - Matthew Morell
- Commonwealth Scientific and Industrial Research Organization, Food Futures National Research Flagship, PO Box 93, North Ryde 1670, NSW, Australia
- Commonwealth Scientific and Industrial Research Organization, Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia
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SONG JM, DAI S, LI HS, LIU AF, CHENG DG, CHU XS, Ian J TETLOW, Michael JEMES. Expression of a Wheat Endosperm 14-3-3 Protein and Its Interactions with Starch Biosynthetic Enzymes in Amyloplasts. ZUOWU XUEBAO 2009. [DOI: 10.3724/sp.j.1006.2009.01445] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Liu F, Makhmoudova A, Lee EA, Wait R, Emes MJ, Tetlow IJ. The amylose extender mutant of maize conditions novel protein-protein interactions between starch biosynthetic enzymes in amyloplasts. JOURNAL OF EXPERIMENTAL BOTANY 2009; 60:4423-40. [PMID: 19805395 DOI: 10.1093/jxb/erp297] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The amylose extender (ae(-)) mutant of maize lacks starch branching enzyme IIb (SBEIIb) activity, resulting in amylopectin with reduced branch point frequency, and longer glucan chains. Recent studies indicate isozymes of soluble starch synthases form high molecular weight complexes with SBEII isoforms. This study investigated the effect of the loss of SBEIIb activity on interactions between starch biosynthetic enzymes in maize endosperm amyloplasts. Results show distinct patterns of protein-protein interactions in amyloplasts of ae(-) mutants compared with the wild type, suggesting functional complementation for loss of SBEIIb by SBEI, SBEIIa, and SP. Coimmunoprecipitation experiments and affinity chromatography using recombinant proteins showed that, in amyloplasts from normal endosperm, protein-protein interactions involving starch synthase I (SSI), SSIIa, and SBEIIb could be detected. By contrast, in ae(-) amyloplasts, SSI and SSIIa interacted with SBEI, SBEIIa, and SP. All interactions in the wild-type were strongly enhanced by ATP, and broken by alkaline phosphatase, indicating a role for protein phosphorylation in their assembly. Whilst ATP and alkaline phosphatase had no effect on the stability of the protein complexes from ae(-) endosperm, radiolabelling experiments showed SP and SBEI were both phosphorylated within the mutant protein complex. It is proposed that, during amylopectin biosynthesis, SSI and SSIIa form the core of a phosphorylation-dependent glucan-synthesizing protein complex which, in normal endosperm, recruits SBEIIb, but when SBEIIb is absent (ae(-)), recruits SBEI, SBEIIa, and SP. Differences in stromal protein complexes are mirrored in the complement of the starch synthesizing enzymes detected in the starch granules of each genotype, reinforcing the hypothesis that the complexes play a functional role in starch biosynthesis.
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Affiliation(s)
- Fushan Liu
- Department of Molecular and Cellular Biology, College of Biological Sciences, University of Guelph, Guelph, Canada
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Grimaud F, Rogniaux H, James MG, Myers AM, Planchot V. Proteome and phosphoproteome analysis of starch granule-associated proteins from normal maize and mutants affected in starch biosynthesis. JOURNAL OF EXPERIMENTAL BOTANY 2008; 59:3395-406. [PMID: 18653693 PMCID: PMC2529236 DOI: 10.1093/jxb/ern198] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2008] [Revised: 06/09/2008] [Accepted: 06/24/2008] [Indexed: 05/20/2023]
Abstract
In addition to the exclusively granule-bound starch synthase GBSSI, starch granules also bind significant proportions of other starch biosynthetic enzymes, particularly starch synthases (SS) SSI and SSIIa, and starch branching enzyme (BE) BEIIb. Whether this association is a functional aspect of starch biosynthesis, or results from non-specific entrapment during amylopectin crystallization, is not known. This study utilized genetic, immunological, and proteomic approaches to investigate comprehensively the proteome and phosphoproteome of Zea mays endosperm starch granules. SSIII, BEI, BEIIa, and starch phosphorylase were identified as internal granule-associated proteins in maize endosperm, along with the previously identified proteins GBSS, SSI, SSIIa, and BEIIb. Genetic analyses revealed three instances in which granule association of one protein is affected by the absence of another biosynthetic enzyme. First, eliminating SSIIa caused reduced granule association of SSI and BEIIb, without affecting GBSS abundance. Second, eliminating SSIII caused the appearance of two distinct electrophoretic mobility forms of BEIIb, whereas only a single migration form of BEIIb was observed in wild type or any other mutant granules examined. Third, eliminating BEIIb caused significant increases in the abundance of BEI, BEIIa, SSIII, and starch phosphorylase in the granule, without affecting SSI or SSIIa. Analysis of the granule phosphoproteome with a phosphorylation-specific dye indicated that GBSS, BEIIb, and starch phosphorylase are all phosphorylated as they occur in the granule. These results suggest the possibility that starch metabolic enzymes located in granules are regulated by post-translational modification and/or protein-protein interactions.
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Affiliation(s)
- Florent Grimaud
- Institut National de la Recherche Agronomique, Unité de Recherche Biopolymères, Interactions, Assemblages, BP 71627, F-44316 Nantes Cedex 03, France
| | - Hélène Rogniaux
- Institut National de la Recherche Agronomique, Unité de Recherche Biopolymères, Interactions, Assemblages, BP 71627, F-44316 Nantes Cedex 03, France
| | - Martha G. James
- Department of Biochemistry, Biophysics, and Molecular Biology, 1210 Molecular Biology Building, Iowa State University, Ames, IA 50011 USA
| | - Alan M. Myers
- Department of Biochemistry, Biophysics, and Molecular Biology, 1210 Molecular Biology Building, Iowa State University, Ames, IA 50011 USA
| | - Véronique Planchot
- Institut National de la Recherche Agronomique, Unité de Recherche Biopolymères, Interactions, Assemblages, BP 71627, F-44316 Nantes Cedex 03, France
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Tetlow IJ, Beisel KG, Cameron S, Makhmoudova A, Liu F, Bresolin NS, Wait R, Morell MK, Emes MJ. Analysis of protein complexes in wheat amyloplasts reveals functional interactions among starch biosynthetic enzymes. PLANT PHYSIOLOGY 2008; 146:1878-91. [PMID: 18263778 PMCID: PMC2287356 DOI: 10.1104/pp.108.116244] [Citation(s) in RCA: 138] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2008] [Accepted: 02/07/2008] [Indexed: 05/20/2023]
Abstract
Protein-protein interactions among enzymes of amylopectin biosynthesis were investigated in developing wheat (Triticum aestivum) endosperm. Physical interactions between starch branching enzymes (SBEs) and starch synthases (SSs) were identified from endosperm amyloplasts during the active phase of starch deposition in the developing grain using immunoprecipitation and cross-linking strategies. Coimmunoprecipitation experiments using peptide-specific antibodies indicate that at least two distinct complexes exist containing SSI, SSIIa, and either of SBEIIa or SBEIIb. Chemical cross linking was used to identify protein complexes containing SBEs and SSs from amyloplast extracts. Separation of extracts by gel filtration chromatography demonstrated the presence of SBE and SS forms in protein complexes of around 260 kD and that SBEII forms may also exist as homodimers. Analysis of cross-linked 260-kD aggregation products from amyloplast lysates by mass spectrometry confirmed SSI, SSIIa, and SBEII forms as components of one or more protein complexes in amyloplasts. In vitro phosphorylation experiments with gamma-(32)P-ATP indicated that SSII and both forms of SBEII are phosphorylated. Treatment of the partially purified 260-kD SS-SBE complexes with alkaline phosphatase caused dissociation of the assembly into the respective monomeric proteins, indicating that formation of SS-SBE complexes is phosphorylation dependent. The 260-kD SS-SBEII protein complexes are formed around 10 to 15 d after pollination and were shown to be catalytically active with respect to both SS and SBE activities. Prior to this developmental stage, SSI, SSII, and SBEII forms were detectable only in monomeric form. High molecular weight forms of SBEII demonstrated a higher affinity for in vitro glucan substrates than monomers. These results provide direct evidence for the existence of protein complexes involved in amylopectin biosynthesis.
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Affiliation(s)
- Ian J Tetlow
- Department of Molecular and Cellular Biology, College of Biological Sciences, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
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Han Y, Bendik E, Sun FJ, Gasic K, Korban SS. Genomic isolation of genes encoding starch branching enzyme II (SBEII) in apple: toward characterization of evolutionary disparity in SbeII genes between monocots and eudicots. PLANTA 2007; 226:1265-76. [PMID: 17564724 DOI: 10.1007/s00425-007-0555-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2007] [Accepted: 05/17/2007] [Indexed: 05/15/2023]
Abstract
Two genes encoding starch branching enzyme II (SBEII) have been identified in apple. These genes share 94 and 92% identity in coding DNA sequences and amino acid sequences, respectively; moreover, they have similar expression patterns. Both genes are expressed in vegetative and reproductive tissues, including leaves, buds, flowers, and fruits. Based on genomic Southern blots, there are two copies of SbeII genes in the apple genome. Comparisons of genomic sequences between monocots and eudicots have revealed that the genomic structure of SbeII genes is conserved. However, the 5'-terminal region of coding DNA sequences of SbeII genes shows greater divergence than the 3'-terminal region between monocots and eudicots. Phylogenetic analysis of DNA sequences has demonstrated that the duplication patterns of SbeII genes are different between monocots and eudicots. In monocots, the duplication of SbeII genes must have occurred prior to the radiation of grasses (Poaceae); while, in eudicots, the expansion of SbeII genes must have followed the process of speciation.
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Affiliation(s)
- Yuepeng Han
- Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801, USA
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