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Klčová B, Balarynová J, Trněný O, Krejčí P, Cechová MZ, Leonova T, Gorbach D, Frolova N, Kysil E, Orlova A, Ihling С, Frolov A, Bednář P, Smýkal P. Domestication has altered gene expression and secondary metabolites in pea seed coat. Plant J 2024. [PMID: 38578789 DOI: 10.1111/tpj.16734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 03/09/2024] [Indexed: 04/07/2024]
Abstract
The mature seed in legumes consists of an embryo and seed coat. In contrast to knowledge about the embryo, we know relatively little about the seed coat. We analyzed the gene expression during seed development using a panel of cultivated and wild pea genotypes. Gene co-expression analysis identified gene modules related to seed development, dormancy, and domestication. Oxidoreductase genes were found to be important components of developmental and domestication processes. Proteomic and metabolomic analysis revealed that domestication favored proteins involved in photosynthesis and protein metabolism at the expense of seed defense. Seed coats of wild peas were rich in cell wall-bound metabolites and the protective compounds predominated in their seed coats. Altogether, we have shown that domestication altered pea seed development and modified (mostly reduced) the transcripts along with the protein and metabolite composition of the seed coat, especially the content of the compounds involved in defense. We investigated dynamic profiles of selected identified phenolic and flavonoid metabolites across seed development. These compounds usually deteriorated the palatability and processing of the seeds. Our findings further provide resources to study secondary metabolism and strategies for improving the quality of legume seeds which comprise an important part of the human protein diet.
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Affiliation(s)
- Barbora Klčová
- Department of Botany, Faculty of Sciences, Palacky University, Šlechtitelů 27, Olomouc, 773 71, Czech Republic
| | - Jana Balarynová
- Department of Botany, Faculty of Sciences, Palacky University, Šlechtitelů 27, Olomouc, 773 71, Czech Republic
| | - Oldřich Trněný
- Agricultural Research Ltd., Zemědělská 1, Troubsko, 664 41, Czech Republic
| | - Petra Krejčí
- Department of Analytical Chemistry, Faculty of Sciences, Palacky University, 17. listopadu 1192/12, Olomouc, 771 46, Czech Republic
| | - Monika Zajacová Cechová
- Department of Analytical Chemistry, Faculty of Sciences, Palacky University, 17. listopadu 1192/12, Olomouc, 771 46, Czech Republic
| | - Tatiana Leonova
- Department of Bioorganic Chemistry, Leibniz-Institut für Pflanzenbiochemie, Weinberg 3, Halle (Saale), 06120, Germany
| | - Daria Gorbach
- Department of Bioorganic Chemistry, Leibniz-Institut für Pflanzenbiochemie, Weinberg 3, Halle (Saale), 06120, Germany
| | - Nadezhda Frolova
- Laboratory of Analytical Biochemistry, Timiryazev Institute of Plant Physiology, Botanicheskaja 36, Moscow, 127276, Russia
| | - Elana Kysil
- Department of Bioorganic Chemistry, Leibniz-Institut für Pflanzenbiochemie, Weinberg 3, Halle (Saale), 06120, Germany
| | - Anastasia Orlova
- Laboratory of Analytical Biochemistry, Timiryazev Institute of Plant Physiology, Botanicheskaja 36, Moscow, 127276, Russia
| | - Сhristian Ihling
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Martin-Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3, Halle (Saale), 06120, Germany
| | - Andrej Frolov
- Laboratory of Analytical Biochemistry, Timiryazev Institute of Plant Physiology, Botanicheskaja 36, Moscow, 127276, Russia
| | - Petr Bednář
- Department of Analytical Chemistry, Faculty of Sciences, Palacky University, 17. listopadu 1192/12, Olomouc, 771 46, Czech Republic
| | - Petr Smýkal
- Department of Botany, Faculty of Sciences, Palacky University, Šlechtitelů 27, Olomouc, 773 71, Czech Republic
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Pigolev AV, Miroshnichenko DN, Dolgov SV, Alekseeva VV, Pushin AS, Degtyaryova VI, Klementyeva A, Gorbach D, Leonova T, Basnet A, Frolov AA, Savchenko TV. Endogenously Produced Jasmonates Affect Leaf Growth and Improve Osmotic Stress Tolerance in Emmer Wheat. Biomolecules 2023; 13:1775. [PMID: 38136646 PMCID: PMC10742046 DOI: 10.3390/biom13121775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 11/20/2023] [Accepted: 11/29/2023] [Indexed: 12/24/2023] Open
Abstract
In light of recent climate change, with its rising temperatures and precipitation changes, we are facing the need to increase the valuable crop's tolerance against unfavorable environmental conditions. Emmer wheat is a cereal crop with high nutritional value. We investigated the possibility of improving the stress tolerance of emmer wheat by activating the synthesis of the stress hormone jasmonate by overexpressing two genes of the jasmonate biosynthetic pathway from Arabidopsis thaliana, ALLENE OXIDE SYNTHASE (AtAOS) and OXOPHYTODIENOATE REDUCTASE 3 (AtOPR3). Analyses of jasmonates in intact and mechanically wounded leaves of non-transgenic and transgenic plants showed that the overexpression of each of the two genes resulted in increased wounding-induced levels of jasmonic acid and jasmonate-isoleucine. Against all expectations, the overexpression of AtAOS, encoding a chloroplast-localized enzyme, does not lead to an increased level of the chloroplast-formed 12-oxo-phytodienoic acid (OPDA), suggesting an effective conversion of OPDA to downstream products in wounded emmer wheat leaves. Transgenic plants overexpressing AtAOS or AtOPR3 with increased jasmonate levels show a similar phenotype, manifested by shortening of the first and second leaves and elongation of the fourth leaf, as well as increased tolerance to osmotic stress induced by the presence of the polyethylene glycol (PEG) 6000.
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Affiliation(s)
- Alexey V. Pigolev
- Institute of Basic Biological Problems, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, 142290 Pushchino, Russia; (A.V.P.); (D.N.M.)
| | - Dmitry N. Miroshnichenko
- Institute of Basic Biological Problems, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, 142290 Pushchino, Russia; (A.V.P.); (D.N.M.)
- Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 142290 Pushchino, Russia; (S.V.D.); (V.V.A.); (A.S.P.); (V.I.D.); (A.K.)
| | - Sergey V. Dolgov
- Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 142290 Pushchino, Russia; (S.V.D.); (V.V.A.); (A.S.P.); (V.I.D.); (A.K.)
| | - Valeria V. Alekseeva
- Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 142290 Pushchino, Russia; (S.V.D.); (V.V.A.); (A.S.P.); (V.I.D.); (A.K.)
| | - Alexander S. Pushin
- Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 142290 Pushchino, Russia; (S.V.D.); (V.V.A.); (A.S.P.); (V.I.D.); (A.K.)
| | - Vlada I. Degtyaryova
- Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 142290 Pushchino, Russia; (S.V.D.); (V.V.A.); (A.S.P.); (V.I.D.); (A.K.)
| | - Anna Klementyeva
- Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 142290 Pushchino, Russia; (S.V.D.); (V.V.A.); (A.S.P.); (V.I.D.); (A.K.)
| | - Daria Gorbach
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany; (D.G.); (T.L.); (A.A.F.)
- Laboratory of Analytical Biochemistry and Biotechnology, Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, 127276 Moscow, Russia
| | - Tatiana Leonova
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany; (D.G.); (T.L.); (A.A.F.)
| | - Aditi Basnet
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany; (D.G.); (T.L.); (A.A.F.)
| | - Andrej A. Frolov
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany; (D.G.); (T.L.); (A.A.F.)
- Laboratory of Analytical Biochemistry and Biotechnology, Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, 127276 Moscow, Russia
| | - Tatyana V. Savchenko
- Institute of Basic Biological Problems, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, 142290 Pushchino, Russia; (A.V.P.); (D.N.M.)
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Degtyaryov E, Pigolev A, Miroshnichenko D, Frolov A, Basnet AT, Gorbach D, Leonova T, Pushin AS, Alekseeva V, Dolgov S, Savchenko T. 12-Oxophytodienoate Reductase Overexpression Compromises Tolerance to Botrytis cinerea in Hexaploid and Tetraploid Wheat. Plants (Basel) 2023; 12:2050. [PMID: 37653967 PMCID: PMC10222670 DOI: 10.3390/plants12102050] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Revised: 05/11/2023] [Accepted: 05/17/2023] [Indexed: 09/02/2023]
Abstract
12-Oxophytodienoate reductase is the enzyme involved in the biosynthesis of phytohormone jasmonates, which are considered to be the major regulators of plant tolerance to biotic challenges, especially necrotrophic pathogens. However, we observe compromised tolerance to the necrotrophic fungal pathogen Botrytis cinerea in transgenic hexaploid bread wheat and tetraploid emmer wheat plants overexpressing 12-OXOPHYTODIENOATE REDUCTASE-3 gene from Arabidopsis thaliana, while in Arabidopsis plants themselves, endogenously produced and exogenously applied jasmonates exert a strong protective effect against B. cinerea. Exogenous application of methyl jasmonate on hexaploid and tetraploid wheat leaves suppresses tolerance to B. cinerea and induces the formation of chlorotic damages. Exogenous treatment with methyl jasmonate in concentrations of 100 µM and higher causes leaf yellowing even in the absence of the pathogen, in agreement with findings on the role of jasmonates in the regulation of leaf senescence. Thereby, the present study demonstrates the negative role of the jasmonate system in hexaploid and tetraploid wheat tolerance to B. cinerea and reveals previously unknown jasmonate-mediated responses.
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Affiliation(s)
- Evgeny Degtyaryov
- Institute of Basic Biological Problems, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, 142290 Pushchino, Russia; (E.D.); (A.P.); (D.M.)
| | - Alexey Pigolev
- Institute of Basic Biological Problems, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, 142290 Pushchino, Russia; (E.D.); (A.P.); (D.M.)
| | - Dmitry Miroshnichenko
- Institute of Basic Biological Problems, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, 142290 Pushchino, Russia; (E.D.); (A.P.); (D.M.)
- Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 142290 Pushchino, Russia; (A.S.P.); (V.A.); (S.D.)
| | - Andrej Frolov
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany; (A.F.); (A.T.B.); (D.G.); (T.L.)
- Laboratory of Analytical Biochemistry and Biotechnology, Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, 127276 Moscow, Russia
| | - Adi Ti Basnet
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany; (A.F.); (A.T.B.); (D.G.); (T.L.)
| | - Daria Gorbach
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany; (A.F.); (A.T.B.); (D.G.); (T.L.)
| | - Tatiana Leonova
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany; (A.F.); (A.T.B.); (D.G.); (T.L.)
| | - Alexander S. Pushin
- Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 142290 Pushchino, Russia; (A.S.P.); (V.A.); (S.D.)
| | - Valeriya Alekseeva
- Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 142290 Pushchino, Russia; (A.S.P.); (V.A.); (S.D.)
| | - Sergey Dolgov
- Branch of Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 142290 Pushchino, Russia; (A.S.P.); (V.A.); (S.D.)
| | - Tatyana Savchenko
- Institute of Basic Biological Problems, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, 142290 Pushchino, Russia; (E.D.); (A.P.); (D.M.)
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Leonova T, Ihling C, Saoud M, Frolova N, Rennert R, Wessjohann LA, Frolov A. Does filter-aided sample preparation provide sufficient method linearity for quantitative plant shotgun proteomics? Front Plant Sci 2022; 13:874761. [PMID: 36507396 PMCID: PMC9728026 DOI: 10.3389/fpls.2022.874761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Accepted: 10/26/2022] [Indexed: 06/17/2023]
Abstract
Due to its outstanding throughput and analytical resolution, gel-free LC-based shotgun proteomics represents the gold standard of proteome analysis. Thereby, the efficiency of sample preparation dramatically affects the correctness and reliability of protein quantification. Thus, the steps of protein isolation, solubilization, and proteolysis represent the principal bottleneck of shotgun proteomics. The desired performance of the sample preparation protocols can be achieved by the application of detergents. However, these compounds ultimately compromise reverse-phase chromatographic separation and disrupt electrospray ionization. Filter-aided sample preparation (FASP) represents an elegant approach to overcome these limitations. Although this method is comprehensively validated for cell proteomics, its applicability to plants and compatibility with plant-specific protein isolation protocols remain to be confirmed. Thereby, the most important gap is the absence of the data on the linearity of underlying protein quantification methods for plant matrices. To fill this gap, we address here the potential of FASP in combination with two protein isolation protocols for quantitative analysis of pea (Pisum sativum) seed and Arabidopsis thaliana leaf proteomes by the shotgun approach. For this aim, in comprehensive spiking experiments with bovine serum albumin (BSA), we evaluated the linear dynamic range (LDR) of protein quantification in the presence of plant matrices. Furthermore, we addressed the interference of two different plant matrices in quantitative experiments, accomplished with two alternative sample preparation workflows in comparison to conventional FASP-based digestion of cell lysates, considered here as a reference. The spiking experiments revealed high sensitivities (LODs of up to 4 fmol) for spiked BSA and LDRs of at least 0.6 × 102. Thereby, phenol extraction yielded slightly better recoveries, whereas the detergent-based method showed better linearity. Thus, our results indicate the very good applicability of FASP to quantitative plant proteomics with only limited impact of the protein isolation technique on the method's overall performance.
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Affiliation(s)
- Tatiana Leonova
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany
- Department of Biochemistry, St Petersburg State University, St Petersburg, Russia
| | - Christian Ihling
- Institute of Pharmacy, Department of Pharmaceutical Chemistry and Bioanalytics, Martin-Luther Universität Halle-Wittenberg, Halle (Saale), Germany
| | - Mohamad Saoud
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany
| | - Nadezhda Frolova
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany
- Department of Biochemistry, St Petersburg State University, St Petersburg, Russia
| | - Robert Rennert
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany
| | - Ludger A. Wessjohann
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany
| | - Andrej Frolov
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany
- Department of Biochemistry, St Petersburg State University, St Petersburg, Russia
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Balarynová J, Klčová B, Sekaninová J, Kobrlová L, Cechová MZ, Krejčí P, Leonova T, Gorbach D, Ihling C, Smržová L, Trněný O, Frolov A, Bednář P, Smýkal P. The loss of polyphenol oxidase function is associated with hilum pigmentation and has been selected during pea domestication. New Phytol 2022; 235:1807-1821. [PMID: 35585778 DOI: 10.1111/nph.18256] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
Seed coats serve as protective tissue to the enclosed embryo. As well as mechanical there are also chemical defence functions. During domestication, the property of the seed coat was altered including the removal of the seed dormancy. We used a range of genetic, transcriptomic, proteomic and metabolomic approaches to determine the function of the pea seed polyphenol oxidase (PPO) gene. Sequencing analysis revealed one nucleotide insertion or deletion in the PPO gene, with the functional PPO allele found in all wild pea samples, while most cultivated peas have one of the three nonfunctional ppo alleles. PPO functionality cosegregates with hilum pigmentation. PPO gene and protein expression, as well as enzymatic activity, was downregulated in the seed coats of cultivated peas. The functionality of the PPO gene relates to the oxidation and polymerisation of gallocatechin in the seed coat. Additionally, imaging mass spectrometry supports the hypothesis that hilum pigmentation is conditioned by the presence of both phenolic precursors and sufficient PPO activity. Taken together these results indicate that the nonfunctional polyphenol oxidase gene has been selected during pea domestication, possibly due to better seed palatability or seed coat visual appearance.
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Affiliation(s)
- Jana Balarynová
- Department of Botany, Faculty of Sciences, Palacky University, Olomouc, 783 71, Czech Republic
| | - Barbora Klčová
- Department of Botany, Faculty of Sciences, Palacky University, Olomouc, 783 71, Czech Republic
| | - Jana Sekaninová
- Department of Biochemistry, Faculty of Sciences, Palacky University, Olomouc, 783 71, Czech Republic
| | - Lucie Kobrlová
- Department of Botany, Faculty of Sciences, Palacky University, Olomouc, 783 71, Czech Republic
| | - Monika Zajacová Cechová
- Department of Analytical Chemistry, Faculty of Sciences, Palacky University, Olomouc, 771 46, Czech Republic
| | - Petra Krejčí
- Department of Analytical Chemistry, Faculty of Sciences, Palacky University, Olomouc, 771 46, Czech Republic
| | - Tatiana Leonova
- Department of Bioorganic Chemistry, Leibniz-Institut für Pflanzenbiochemie, Halle (Saale), 06120, Germany
- Department of Biochemistry, St Petersburg State University, St Petersburg, 199004, Russia
| | - Daria Gorbach
- Department of Biochemistry, St Petersburg State University, St Petersburg, 199004, Russia
| | - Christian Ihling
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Martin-Luther University, Halle-Wittenberg, 06120, Germany
| | - Lucie Smržová
- Department of Botany, Faculty of Sciences, Palacky University, Olomouc, 783 71, Czech Republic
| | - Oldřich Trněný
- Agricultural Research Ltd, Troubsko, 664 41, Czech Republic
| | - Andrej Frolov
- Department of Bioorganic Chemistry, Leibniz-Institut für Pflanzenbiochemie, Halle (Saale), 06120, Germany
- Department of Biochemistry, St Petersburg State University, St Petersburg, 199004, Russia
| | - Petr Bednář
- Department of Analytical Chemistry, Faculty of Sciences, Palacky University, Olomouc, 771 46, Czech Republic
| | - Petr Smýkal
- Department of Botany, Faculty of Sciences, Palacky University, Olomouc, 783 71, Czech Republic
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Smolikova G, Strygina K, Krylova E, Leonova T, Frolov A, Khlestkina E, Medvedev S. Transition from Seeds to Seedlings: Hormonal and Epigenetic Aspects. Plants (Basel) 2021; 10:1884. [PMID: 34579418 PMCID: PMC8467299 DOI: 10.3390/plants10091884] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/02/2021] [Accepted: 09/08/2021] [Indexed: 01/21/2023]
Abstract
Transition from seed to seedling is one of the critical developmental steps, dramatically affecting plant growth and viability. Before plants enter the vegetative phase of their ontogenesis, massive rearrangements of signaling pathways and switching of gene expression programs are required. This results in suppression of the genes controlling seed maturation and activation of those involved in regulation of vegetative growth. At the level of hormonal regulation, these events are controlled by the balance of abscisic acid and gibberellins, although ethylene, auxins, brassinosteroids, cytokinins, and jasmonates are also involved. The key players include the members of the LAFL network-the transcription factors LEAFY COTYLEDON1 and 2 (LEC 1 and 2), ABSCISIC ACID INSENSITIVE3 (ABI3), and FUSCA3 (FUS3), as well as DELAY OF GERMINATION1 (DOG1). They are the negative regulators of seed germination and need to be suppressed before seedling development can be initiated. This repressive signal is mediated by chromatin remodeling complexes-POLYCOMB REPRESSIVE COMPLEX 1 and 2 (PRC1 and PRC2), as well as PICKLE (PKL) and PICKLE-RELATED2 (PKR2) proteins. Finally, epigenetic methylation of cytosine residues in DNA, histone post-translational modifications, and post-transcriptional downregulation of seed maturation genes with miRNA are discussed. Here, we summarize recent updates in the study of hormonal and epigenetic switches involved in regulation of the transition from seed germination to the post-germination stage.
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Affiliation(s)
- Galina Smolikova
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia;
| | - Ksenia Strygina
- Postgenomic Studies Laboratory, Federal Research Center N.I. Vavilov All-Russian Institute of Plant Genetic Resources, 190121 St. Petersburg, Russia; (K.S.); (E.K.); (E.K.)
| | - Ekaterina Krylova
- Postgenomic Studies Laboratory, Federal Research Center N.I. Vavilov All-Russian Institute of Plant Genetic Resources, 190121 St. Petersburg, Russia; (K.S.); (E.K.); (E.K.)
| | - Tatiana Leonova
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany; (T.L.); (A.F.)
- Department of Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Andrej Frolov
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany; (T.L.); (A.F.)
- Department of Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Elena Khlestkina
- Postgenomic Studies Laboratory, Federal Research Center N.I. Vavilov All-Russian Institute of Plant Genetic Resources, 190121 St. Petersburg, Russia; (K.S.); (E.K.); (E.K.)
| | - Sergei Medvedev
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia;
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Barsukova I, Leonova T. Biological features of Nitraria sibirica Pall. and the structure of its coenopopulation (the Republic of Khakasia). BIO Web Conf 2021. [DOI: 10.1051/bioconf/20213800011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The life form of Nitraria sibirica Pall. and the structure of its coenopopulation has been studied in natural conditions. Laboratory germination of seeds was investigated. Individuals build the life form of a hypogeogenic-geoxyle vegetative-mobile shrub. It is found that the coenopopulation is normal incomplete, the ontogenetic spectrum is of a centered type. The germination of seeds does not exceed 6 %.
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Smolikova G, Leonova T, Vashurina N, Frolov A, Medvedev S. Desiccation Tolerance as the Basis of Long-Term Seed Viability. Int J Mol Sci 2020; 22:E101. [PMID: 33374189 PMCID: PMC7795748 DOI: 10.3390/ijms22010101] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 12/21/2020] [Accepted: 12/22/2020] [Indexed: 12/15/2022] Open
Abstract
Desiccation tolerance appeared as the key adaptation feature of photoautotrophic organisms for survival in terrestrial habitats. During the further evolution, vascular plants developed complex anatomy structures and molecular mechanisms to maintain the hydrated state of cell environment and sustain dehydration. However, the role of the genes encoding the mechanisms behind this adaptive feature of terrestrial plants changed with their evolution. Thus, in higher vascular plants it is restricted to protection of spores, seeds and pollen from dehydration, whereas the mature vegetative stages became sensitive to desiccation. During maturation, orthodox seeds lose up to 95% of water and successfully enter dormancy. This feature allows seeds maintaining their viability even under strongly fluctuating environmental conditions. The mechanisms behind the desiccation tolerance are activated at the late seed maturation stage and are associated with the accumulation of late embryogenesis abundant (LEA) proteins, small heat shock proteins (sHSP), non-reducing oligosaccharides, and antioxidants of different chemical nature. The main regulators of maturation and desiccation tolerance are abscisic acid and protein DOG1, which control the network of transcription factors, represented by LEC1, LEC2, FUS3, ABI3, ABI5, AGL67, PLATZ1, PLATZ2. This network is complemented by epigenetic regulation of gene expression via methylation of DNA, post-translational modifications of histones and chromatin remodeling. These fine regulatory mechanisms allow orthodox seeds maintaining desiccation tolerance during the whole period of germination up to the stage of radicle protrusion. This time point, in which seeds lose desiccation tolerance, is critical for the whole process of seed development.
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Affiliation(s)
- Galina Smolikova
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia;
| | - Tatiana Leonova
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia; (T.L.); (N.V.); (A.F.)
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany
| | - Natalia Vashurina
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia; (T.L.); (N.V.); (A.F.)
| | - Andrej Frolov
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia; (T.L.); (N.V.); (A.F.)
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle (Saale), Germany
| | - Sergei Medvedev
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia;
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Reiners C, Biko J, Leonova T, Drozd V. Treatment of thyroid carcinoma after the Chernobyl power plant accident: a difficult balancing act. Lancet 2020; 395:e61. [PMID: 32222199 DOI: 10.1016/s0140-6736(20)30306-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 01/09/2020] [Accepted: 01/31/2020] [Indexed: 11/29/2022]
Affiliation(s)
- Christoph Reiners
- Department of Nuclear Medicine, University Hospital, Würzburg, Germany.
| | - Johannes Biko
- Department of Nuclear Medicine, University Hospital, Würzburg, Germany
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10
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Leonova T, Popova V, Tsarev A, Henning C, Antonova K, Rogovskaya N, Vikhnina M, Baldensperger T, Soboleva A, Dinastia E, Dorn M, Shiroglasova O, Grishina T, Balcke GU, Ihling C, Smolikova G, Medvedev S, Zhukov VA, Babakov V, Tikhonovich IA, Glomb MA, Bilova T, Frolov A. Does Protein Glycation Impact on the Drought-Related Changes in Metabolism and Nutritional Properties of Mature Pea ( Pisum sativum L.) Seeds? Int J Mol Sci 2020; 21:E567. [PMID: 31952342 PMCID: PMC7013545 DOI: 10.3390/ijms21020567] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 01/01/2020] [Accepted: 01/03/2020] [Indexed: 12/24/2022] Open
Abstract
Protein glycation is usually referred to as an array of non-enzymatic post-translational modifications formed by reducing sugars and carbonyl products of their degradation. The resulting advanced glycation end products (AGEs) represent a heterogeneous group of covalent adducts, known for their pro-inflammatory effects in mammals, and impacting on pathogenesis of metabolic diseases and ageing. In plants, AGEs are the markers of tissue ageing and response to environmental stressors, the most prominent of which is drought. Although water deficit enhances protein glycation in leaves, its effect on seed glycation profiles is still unknown. Moreover, the effect of drought on biological activities of seed protein in mammalian systems is still unstudied with respect to glycation. Therefore, here we address the effects of a short-term drought on the patterns of seed protein-bound AGEs and accompanying alterations in pro-inflammatory properties of seed protein in the context of seed metabolome dynamics. A short-term drought, simulated as polyethylene glycol-induced osmotic stress and applied at the stage of seed filling, resulted in the dramatic suppression of primary seed metabolism, although the secondary metabolome was minimally affected. This was accompanied with significant suppression of NF-kB activation in human SH-SY5Y neuroblastoma cells after a treatment with protein hydrolyzates, isolated from the mature seeds of drought-treated plants. This effect could not be attributed to formation of known AGEs. Most likely, the prospective anti-inflammatory effect of short-term drought is related to antioxidant effect of unknown secondary metabolite protein adducts, or down-regulation of unknown plant-specific AGEs due to suppression of energy metabolism during seed filling.
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Affiliation(s)
- Tatiana Leonova
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Veronika Popova
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Alexander Tsarev
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Christian Henning
- Institute of Chemistry - Food Chemistry, Martin-Luther University Halle-Wittenberg, 06120 Halle, Germany
| | - Kristina Antonova
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Nadezhda Rogovskaya
- Research Institute of Hygiene, Occupational Pathology and Human Ecology, 188663 Leningrad Oblast, Russia
| | - Maria Vikhnina
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Tim Baldensperger
- Institute of Chemistry - Food Chemistry, Martin-Luther University Halle-Wittenberg, 06120 Halle, Germany
| | - Alena Soboleva
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Ekaterina Dinastia
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany
- Postovsky Institute of Organic Synthesis of Ural Division of Russian Academy of Sciences, 620137 Yekaterinburg, Russia
| | - Mandy Dorn
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Olga Shiroglasova
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Tatiana Grishina
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia
| | - Gerd U Balcke
- Department of Metabolic and Cell Biology, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany
| | - Christian Ihling
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Martin-Luther University Halle-Wittenberg, 06120 Halle, Germany
| | - Galina Smolikova
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Sergei Medvedev
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Vladimir A Zhukov
- All-Russia Research Institute for Agricultural Microbiology, 196608 St. Petersburg, Russia
| | - Vladimir Babakov
- Research Institute of Hygiene, Occupational Pathology and Human Ecology, 188663 Leningrad Oblast, Russia
| | - Igor A Tikhonovich
- All-Russia Research Institute for Agricultural Microbiology, 196608 St. Petersburg, Russia
- Department of Genetics and Biotechnology, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Marcus A Glomb
- Institute of Chemistry - Food Chemistry, Martin-Luther University Halle-Wittenberg, 06120 Halle, Germany
| | - Tatiana Bilova
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Andrej Frolov
- Department of Biochemistry, St. Petersburg State University, 199004 St. Petersburg, Russia
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, 06120 Halle, Germany
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Abstract
Biological and structural peculiarities of Erodium tataricum Willd. cenopopulations in natural surroundings of Khakasia are examined. It is found out that the species make two vegetal forms under the changing environmental conditions. Ontogeny is complete, regeneration does not take place. Two types of ontogeny are found out: morphological and dynamic (according to the rate of growth). Examined Erodium tataricum Willd. cenopopulations are normal and incomplete. They are characterized by left-sided and bimodal ontogenetic spectra.
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Krzewińska M, Kılınç GM, Juras A, Koptekin D, Chyleński M, Nikitin AG, Shcherbakov N, Shuteleva I, Leonova T, Kraeva L, Sungatov FA, Sultanova AN, Potekhina I, Łukasik S, Krenz-Niedbała M, Dalén L, Sinika V, Jakobsson M, Storå J, Götherström A. Ancient genomes suggest the eastern Pontic-Caspian steppe as the source of western Iron Age nomads. Sci Adv 2018; 4:eaat4457. [PMID: 30417088 PMCID: PMC6223350 DOI: 10.1126/sciadv.aat4457] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 08/23/2018] [Indexed: 05/25/2023]
Abstract
For millennia, the Pontic-Caspian steppe was a connector between the Eurasian steppe and Europe. In this scene, multidirectional and sequential movements of different populations may have occurred, including those of the Eurasian steppe nomads. We sequenced 35 genomes (low to medium coverage) of Bronze Age individuals (Srubnaya-Alakulskaya) and Iron Age nomads (Cimmerians, Scythians, and Sarmatians) that represent four distinct cultural entities corresponding to the chronological sequence of cultural complexes in the region. Our results suggest that, despite genetic links among these peoples, no group can be considered a direct ancestor of the subsequent group. The nomadic populations were heterogeneous and carried genetic affinities with populations from several other regions including the Far East and the southern Urals. We found evidence of a stable shared genetic signature, making the eastern Pontic-Caspian steppe a likely source of western nomadic groups.
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Affiliation(s)
- Maja Krzewińska
- Archaeological Research Laboratory, Department of Archaeology and Classical Studies, Stockholm University, Lilla Frescativägen 7, SE-106 91 Stockholm, Sweden
| | - Gülşah Merve Kılınç
- Archaeological Research Laboratory, Department of Archaeology and Classical Studies, Stockholm University, Lilla Frescativägen 7, SE-106 91 Stockholm, Sweden
| | - Anna Juras
- Department of Human Evolutionary Biology, Institute of Anthropology, Faculty of Biology, Adam Mickiewicz University in Poznań, Umultowska 89, 61-614 Poznań, Poland
| | - Dilek Koptekin
- Department of Health Informatics, Middle East Technical University, 06800 Ankara, Turkey
| | - Maciej Chyleński
- Institute of Archaeology, Faculty of History, Adam Mickiewicz University in Poznań, Umultowska 89D, 61-614 Poznań, Poland
| | - Alexey G. Nikitin
- Biology Department, Grand Valley State University, 1 Campus Drive, Allendale, MI 49401, USA
| | - Nikolai Shcherbakov
- Laboratory of Methodology and Methods of Humanitarian Research, Bashkir State Pedagogical University, Octyabrskoy Revolutsii, 3A, 450007 Ufa, Russia
| | - Iia Shuteleva
- Laboratory of Methodology and Methods of Humanitarian Research, Bashkir State Pedagogical University, Octyabrskoy Revolutsii, 3A, 450007 Ufa, Russia
- Institute of History and State Management, Bashkir State University, Zaki Validy Street 32, 450076 Ufa, Russia
| | - Tatiana Leonova
- Laboratory of Methodology and Methods of Humanitarian Research, Bashkir State Pedagogical University, Octyabrskoy Revolutsii, 3A, 450007 Ufa, Russia
| | - Liudmila Kraeva
- Archaeological Laboratory, Orenburg State Pedagogical University, Orenburg, Russia
| | - Flarit A. Sungatov
- Archaeological Laboratory, Bashkir State University, Str. Validi Z. 32, Ufa, Russia
| | - Alfija N. Sultanova
- Archaeological Laboratory, Bashkir State University, Str. Validi Z. 32, Ufa, Russia
| | - Inna Potekhina
- Institute of Archaeology, National Academy of Sciences of Ukraine, Kiev, Ukraine
| | - Sylwia Łukasik
- Department of Human Evolutionary Biology, Institute of Anthropology, Faculty of Biology, Adam Mickiewicz University in Poznań, Umultowska 89, 61-614 Poznań, Poland
| | - Marta Krenz-Niedbała
- Department of Human Evolutionary Biology, Institute of Anthropology, Faculty of Biology, Adam Mickiewicz University in Poznań, Umultowska 89, 61-614 Poznań, Poland
| | - Love Dalén
- Department of Bioinformatics and Genetics, Swedish Museum of Natural History, Post Office Box 50007, 10405 Stockholm, Sweden
| | - Vitaly Sinika
- Taras Shevchenko University in Tiraspol, October Street 25, 33-00 Tiraspol, Moldova
- Nizhnevartovsk State University, Lenin Street, 56, Nizhnevartovsk, 628605, Khanty-Mansi Autonomous District, Yugra, Russia
| | - Mattias Jakobsson
- Subdepartment of Human Evolution, Department of Organismal Biology, Uppsala University, Norbyvägen 18 C, SE-752 36 Uppsala, Sweden
- Science for Life Laboratory, Norbyvägen 18 C, SE-752 36 Uppsala, Sweden
- Centre for Anthropological Research and Department of Anthropology and Development Studies, University of Johannesburg, Post Office Box 524, Auckland Park 2006, South Africa
| | - Jan Storå
- Osteoarchaeological Research Laboratory, Department of Archaeology and Classical Studies, Stockholm University, Lilla Frescativägen 7, SE-106 91 Stockholm, Sweden
| | - Anders Götherström
- Archaeological Research Laboratory, Department of Archaeology and Classical Studies, Stockholm University, Lilla Frescativägen 7, SE-106 91 Stockholm, Sweden
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Leonova T, Ovchinnykova V, Souer E, de Boer A, Kharchenko P, Babakov A. Isolated Thellungiella shoots do not require roots to survive NaCl and Na2SO4 salt stresses. Plant Signal Behav 2009; 4:1059-62. [PMID: 19829064 PMCID: PMC2819513 DOI: 10.4161/psb.4.11.9799] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Revised: 08/12/2009] [Accepted: 08/13/2009] [Indexed: 05/28/2023]
Abstract
Shoots of Thellungiella derived by micropropagation were used to estimate the plants' salt tolerance and ability to regulate Na+ uptake. Two species with differing salt tolerances were studied: Thellungiella salsuginea (halophilla), which is less tolerant, and Thellungiella botschantzevii, which is more tolerant. Although the shoots of neither ecotype survived at 700 mM NaCl or 200 mM Na2SO4, micropropagated shoots of T. botschantzevii were more tolerant to Na2SO4 (10-100 mM) and NaCl (100-300 mM). In the absence of roots, Na2SO4 salinity reduced shoot growth more dramatically than NaCl salinity. Plantlets of both species were able to adapt to salt stress even when they did not form roots. First, there was no significant correlation between Na+ accumulation in shoots and Na+ concentration in the growth media. Second, K+ concentrations in the shoots exposed to different salt concentrations were maintained at equivalent levels to control plants grown in medium without NaCl or Na2SO4. These results suggest that isolated shoots of Thellungiella possess their own mechanisms for enabling salt tolerance, which contribute to salt tolerance in intact plants.
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Affiliation(s)
- Tatiana Leonova
- All-Russian Research Institute of Agricultural Biotechnology, Russian Academy of Agricultural Sciences, Moscow, Russia.
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14
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Abstract
Gaucher disease (GD) is associated with mutations at the acid beta-glucosidase (GCase) locus and the resultant defective activity of the enzyme product. GCase is a membrane-associated glycoprotein that requires detergents for extraction and phospholipid interfaces for full catalytic activity. Normal human fibroblasts and overexpressing transgenic cell lines were used to evaluate the intracellular disappearance, degradation, and secretion of human GCase, including GD fibroblasts and C2C12 cells transduced with MFG-GCase retrovirus and CHO cells stably transfected with the tetracycline transactivation conditional expression system (tet-CHO-GCase). Compared to HF, the disappearance of GCase from the transgenic cells was 12-30 times greater, and had degradative and secretory components. In tet-CHO-GCase cells the majority of GCase was secreted. Intracellular degradation occurred in compartments sensitive to monensin and brefeldin A, and the ALLN or leupeptin protease inhibitors, i.e., ER, Golgi, and lysosomes. In tet-CHO-GCase cells, GCase degradation and secretion rates were inversely related to expression level. Saponin permeabilization analyses of tet-CHO-GCase cells showed that a majority of GCase was soluble, with a rapid disappearance via secretion and degradation. A progressively increasing proportion of GCase became saponin insoluble with a t(1/2) = 2-3 h. Intracellular saponin-soluble and -insoluble GCases were degraded with t(1/2) approximately 2 and 14 h, respectively. Confocal microscopy showed colocalization of glycosylated or unglycosylated GCase with LAMP-2, an integral lysosomal membrane protein, to vesicular bodies. These studies show that GCase secretion was N-linked glycosylation dependent, whereas sorting to and membrane attachment in the lysosome were N-linked glycosylation independent.
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Affiliation(s)
- T Leonova
- The Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA
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15
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Qi X, Kondoh K, Krusling D, Kelso GJ, Leonova T, Grabowski GA. Conformational and amino acid residue requirements for the saposin C neuritogenic effect. Biochemistry 1999; 38:6284-91. [PMID: 10320358 DOI: 10.1021/bi990079o] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Prosaposin is the precursor of four activator proteins, termed saposins A, B, C, and D, that are required for much of glycosphingolipid hydrolysis. The intact precursor also has neurite outgrowth activity ex vivo and in vivo that is localized to amino acid residues 22-31 of saposin C. Across species, this saposin C region has a high degree of identity and similarity with amino acids in the analogous region of saposin A. Wild-type and mutant saposins C and A from human and mouse were expressed in E. coli. Pure proteins, synthetic peptide analogues, conformation-specific antibodies, and CD spectroscopy were used to evaluate the basis of the ex vivo neuritogenic effect. Wild-type saposin A had no neuritogenic activity whereas reduced and alkylated saposin A did. Introduction of the conserved saposin A Tyr 30 (Y30) into saposin C at the analogous position 31, a conserved Ala(A)/Gly(G)31, diminished neuritogenic activity by 50-60%. Nondenatured saposin A with an introduced A30 acquired substantial neuritogenic activity. Polyclonal antibodies directed against the NH2-terminus of saposin C cross-reacted well with reduced and alkylated saposins C and A, wild-type saposin C, and saposin A [Y30A], poorly with saposin C [A31Y], and not at all with wild-type saposin A. CD spectra of wild-type and mutant saposins C and A, the corresponding neuritogenic region of saposin C, and the analogous region of saposin A showed that more "saposin C-like" molecules had neuritogenic properties. Those with more "saposin A-like" spectra did not. These studies show that the neuritogenic activity of saposin C requires specific placement of amino acids, and that Y30 of saposin A significantly alters local conformation in this critical region and suppresses neuritogenic activity.
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Affiliation(s)
- X Qi
- Children's Hospital Research Foundation and Departments of Pediatrics and of Molecular Genetics, Biochemistry, and Microbiology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45229, USA
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Abstract
Human lysosomal acid lipase (hLAL) is essential for the hydrolysis of cholesteryl esters and triglycerides in the lysosome. Defective hLAL activity leads to two autosomal recessive traits, Wolman disease (WD) or cholesteryl ester storage disease (CESD). Phenotypically, WD has accumulation of both triglycerides and cholesteryl esters, while CESD has mainly elevated cholesteryl esters. We characterized mutations in the hLAL gene from two CESD siblings. By reverse transcriptase-PCR (RT-PCR) and cDNA cloning and sequencing, we identified homozygous deletion mutations of nucleotides 863 to 934, in the hLAL transcript. Normal levels of LAL mRNA were detected. The deletion in mRNA is due to a G to A transition in the last nucleotide of exon 8 of the hLAL gene, a splice junction mutation (E8SJM) that resulted in exon skipping, and a predicted in-frame deletion of the 24 amino acids. [35S]Met metabolic labeling studies in fibroblasts showed a low level of E8SJM LAL ( approximately 38%) that was highly unstable. Heterologous expression of E8SJM LAL in insect cells gave an LAL with low catalytic activity toward cholesteryl oleate and triolein. The effects of this mutation are complex with the production of decreased amounts of an unstable LAL that is catalytically defective. The results suggest that E8SJM leads to essentially a null allele and that the differences in WD and CESD phenotype involve other factors.
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Affiliation(s)
- H Du
- College of Medicine, Children's Hospital Research Foundation of Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA
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17
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Abstract
Prosaposin is a multifunctional protein encoded at a single locus in humans and mice. The precursor contains, in tandem, four glycoprotein activators or saposins, termed A, B, C, and D, that are essential for specific glycosphingolipid hydrolase activities. Prosaposin appears to be a potent neurotrophic factor. To explore the proteolytic processing from prosaposin to mature activator proteins, metabolic labeling was done with human prosaposin expressed in insect cells, human fibroblasts, neuronal stem cells (NT2) and retinoic acid-differentiated NT2 neurons. In all cell types, the major processing pathway was through a tetrasaposin, A-B-C-D, from which saposin A was then removed. In mammalian cells monosaposins were derived from the trisaposin B-C-D by cleavage to the disaposins, B-C and C-D, that were processed to monosaposins. In insect cells the major end products were the disaposins, with A-B and C-D derived from the tetrasaposin, A-B-C-D, or with B-C and C-D derived from the trisaposin, B-C-D. In insect and mammalian cells, the nonsignal NH2-terminal peptide preceding saposin A (termed Nter) was usually removed prior to saposin A cleavage. In NT2-derived differentiated neurons, precursor tetrasaposins containing A-B-C-D were secreted with and without Nter. Immunofluorescence studies using prosaposin-specific antisera showed large steady state amounts of uncleaved prosaposin in Purkinje cells, cortical neurons, and other specific cell types in adult mice. These studies indicate that prosaposin processing is highly regulated at a proteolytic level to produce prosaposin, tetrasaposins, or mature monosaposins in specific mammalian cells.
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Affiliation(s)
- T Leonova
- Division of Human Genetics, Children's Hospital Research Foundation at Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA
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18
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Xu YH, Ponce E, Sun Y, Leonova T, Bove K, Witte D, Grabowski GA. Turnover and distribution of intravenously administered mannose-terminated human acid beta-glucosidase in murine and human tissues. Pediatr Res 1996; 39:313-22. [PMID: 8825806 DOI: 10.1203/00006450-199602000-00021] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Gaucher disease type 1, the most prevalent lysosomal storage disease, is caused by the defective activity of the lysosomal enzyme, acid beta-glucosidase, or glucocerebrosidase. Infusion of purified acid beta-glucosidase containing alpha-mannosyl-terminated oligosaccharides (alglucerase) is efficacious in reversing hematologic, hepatic, splenic, and bony disease manifestations. The murine tissue distribution and turnover of bolus injections of alglucerase was evaluated by enzymatic activity, quantitative cross-reacting immunologic material analyses, and immunofluorescence studies. Enzyme activity measurements detected distribution to liver, spleen, thymus, kidney, and bone marrow mononuclear cells, but not to lungs and brain. In kidney and thymus, the enzyme was transiently present. In liver and spleen, enzyme activity peaked at about 20 min postinjection followed by a biphasic decrease with t1/2 approximately 40-60 min and approximately 12-14 h. In bone marrow maximal enzyme activity was at 40-60 min with a disappearance t1/2 approximately 60 min. Quantitative cross-reacting immunologic material studies of liver and spleen showed delivery of enzyme with decreased catalytic rate constants whose degradation included denaturation and proteolytic components. By immunofluorescence the human enzyme was distributed primarily to reticuloendothelial cells of the liver and spleen. In autopsy material from a Gaucher disease type 2 patient treated with enzyme, immunohistochemical and activity studies showed distributions similar to those in mice. These studies indicate a complex delivery and intracellular degradation of acid beta-glucosidase with lower intrinsic activity than the administered therapeutic agent.
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Affiliation(s)
- Y H Xu
- Division of Human Genetics, Children's Hospital Research Foundation, Cincinnati, Ohio, USA
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19
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Qi X, Leonova T, Grabowski GA. Functional human saposins expressed in Escherichia coli. Evidence for binding and activation properties of saposins C with acid beta-glucosidase. J Biol Chem 1994. [PMID: 8206997 DOI: 10.1016/s0021-9258(19)89454-1] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Small (80-amino acid) glycoproteins or saposins are important for the in vivo function of several lysosomal hydrolases. Four saposins, A, B, C, and D, are encoded by a single locus termed prosaposin. Saposins C and A are thought to function in vivo as activators of acid beta-glucosidase. The physiologic role of saposin C has been confirmed, whereas that of saposin A role has not. To investigate the effects of saposins C and A on acid beta-glucosidase activity, the coding sequence for the individual saposins was expressed in Escherichia coli and the recombinant proteins purified to homogeneity. Recombinant and natural saposins A and C activated acid beta-glucosidase similarly only in micromolar amounts. Saposin C had specific activation of acid beta-glucosidase activity at < 200 nM. A second phase of activation was achieved at > 1 microM. In comparison, saposin A consistently activated acid beta-glucosidase only at > 1 microM. Two mutant saposins C (Cys382-->Phe and Cys382--Gly) were created and shown to compete with saposin C for a site on acid beta-glucosidase. The mutant saposins did not activate the enzyme. Recombinant saposin A (< 200 nM) competed with saposin C for a site on the enzyme but without activating effects. These studies show that saposin A is not an in vitro activator of acid beta-glucosidase at physiologic concentrations, although binding occurs without activating acid beta-glucosidase. The studies with mutant saposins C indicate that the binding and activation effects of saposins C are distinct events. These results indicate that the saposin C-induced conformational change in the enzyme occurs via highly specific, probably multivalent, interactions between acid beta-glucosidase and saposin C.
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Affiliation(s)
- X Qi
- Division of Human Genetics, Children's Hospital Research Foundation, Cincinnati, Ohio
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20
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Qi X, Leonova T, Grabowski GA. Functional human saposins expressed in Escherichia coli. Evidence for binding and activation properties of saposins C with acid beta-glucosidase. J Biol Chem 1994; 269:16746-53. [PMID: 8206997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Small (80-amino acid) glycoproteins or saposins are important for the in vivo function of several lysosomal hydrolases. Four saposins, A, B, C, and D, are encoded by a single locus termed prosaposin. Saposins C and A are thought to function in vivo as activators of acid beta-glucosidase. The physiologic role of saposin C has been confirmed, whereas that of saposin A role has not. To investigate the effects of saposins C and A on acid beta-glucosidase activity, the coding sequence for the individual saposins was expressed in Escherichia coli and the recombinant proteins purified to homogeneity. Recombinant and natural saposins A and C activated acid beta-glucosidase similarly only in micromolar amounts. Saposin C had specific activation of acid beta-glucosidase activity at < 200 nM. A second phase of activation was achieved at > 1 microM. In comparison, saposin A consistently activated acid beta-glucosidase only at > 1 microM. Two mutant saposins C (Cys382-->Phe and Cys382--Gly) were created and shown to compete with saposin C for a site on acid beta-glucosidase. The mutant saposins did not activate the enzyme. Recombinant saposin A (< 200 nM) competed with saposin C for a site on the enzyme but without activating effects. These studies show that saposin A is not an in vitro activator of acid beta-glucosidase at physiologic concentrations, although binding occurs without activating acid beta-glucosidase. The studies with mutant saposins C indicate that the binding and activation effects of saposins C are distinct events. These results indicate that the saposin C-induced conformational change in the enzyme occurs via highly specific, probably multivalent, interactions between acid beta-glucosidase and saposin C.
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Affiliation(s)
- X Qi
- Division of Human Genetics, Children's Hospital Research Foundation, Cincinnati, Ohio
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