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Yang DZ, Tang J, Cheng YL, Yang YS, Wei JF, Sun JL, Xu ZQ. Identification and Characterization of Pectate Lyase as a Novel Allergen in Artemisia sieversiana Pollen. Int Arch Allergy Immunol 2024:1-14. [PMID: 38897183 DOI: 10.1159/000539375] [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: 02/25/2024] [Accepted: 05/14/2024] [Indexed: 06/21/2024] Open
Abstract
INTRODUCTION Artemisia species are widely spread in north hemisphere. Artemisia sieversiana pollen is one of the common pollen allergens in the north of China. At present, seven allergens were identified and had been listed officially from A. sieversiana pollen, but the remaining allergens are still insufficiently studied, which need to be found. METHODS Pectate lyase was purified from the extracts of A. sieversiana pollen by anion exchange, size exclusion, and HPLC-hydrophobic interaction chromatography. The gene of A. sieversiana pectate lyase (Art si pectate lyase) was cloned and expressed in Escherichia coli. The enzyme activity and circular dichroism (CD) spectrum of natural and recombinant proteins were analyzed. The allergenicity of Art si pectate lyase was characterized by enzyme-linked immunosorbent assay (ELISA), Western blot, inhibition ELISA, and basophil activation test. The allergen's physicochemical properties, three-dimensional structure, sequence profiles with homologous allergens and phylogenetic tree were analyzed by in silico methods. RESULTS Natural Art si pectate lyase (nArt si pectate lyase) was purified from A. sieversiana pollen extracts by three chromatographic strategies. The cDNA sequence of Art si pectate lyase had a 1191-bp open reading frame encoding 396 amino acids. Both natural and recombinant pectate lyase (rArt si pectate lyase) exhibited similar CD spectrum, and nArt si pectate lyase had higher enzymatic activity. Moreover, the specific immunoglobulin E (IgE) binding rate against nArt si pectate lyase and rArt si pectate lyase was determined as 40% (6/15) in patients' serum with Artemisia species pollen allergy by ELISA. The nArt si pectate lyase and rArt si pectate lyase could inhibit 76.11% and 47.26% of IgE binding activities to the pollen extracts, respectively. Art si pectate lyase was also confirmed to activate patients' basophils. Its structure contains a predominant motif of classic parallel helical core, consisting of three parallel β-sheets, and two highly conserved features (vWiDH, RxPxxR) which may contribute to pectate lyase activity. Moreover, Art si pectate lyase shared the highest sequence identity of 73.0% with Art v 6 among currently recognized pectate lyase allergen, both were clustered into the same branch in the phylogenetic tree. CONCLUSION In this study, pectate lyase was identified and comprehensively characterized as a novel allergen in A. sieversiana pollen. The findings enriched the allergen information for this pollen and promoted the development of component-resolved diagnosis and molecular therapy of A. sieversiana pollen allergy.
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Affiliation(s)
- De-Zheng Yang
- Department of Pharmacy, The Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing, China
| | - Jian Tang
- Department of Pharmacy, The Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing, China
| | - Ya-Li Cheng
- Department of Allergy, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Yong-Shi Yang
- Department of Allergy, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Ji-Fu Wei
- Department of Pharmacy, The Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing, China
- Research Division of Clinical Pharmacology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
- National Vaccine Innovation Platform, Nanjing Medical University, Nanjing, China
| | - Jin-Lyu Sun
- Department of Allergy, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Zhi-Qiang Xu
- Research Division of Clinical Pharmacology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
- National Vaccine Innovation Platform, Nanjing Medical University, Nanjing, China
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Ding X, Wang B, Gong Y, Yan X, Chen X, Zhong Y, Zhao Z. Exogenous Methyl Jasmonate (MeJA) Improves 'Ruixue' Apple Fruit Quality by Regulating Cell Wall Metabolism. Foods 2024; 13:1594. [PMID: 38890824 PMCID: PMC11171686 DOI: 10.3390/foods13111594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Revised: 05/05/2024] [Accepted: 05/16/2024] [Indexed: 06/20/2024] Open
Abstract
'Ruixue' apples were used as the test material to study the effect of 10 μM methyl jasmonate (MeJA) on the quality and cell wall metabolism of apples after 18 d of storage. The results showed that MeJA significantly decreased the respiratory rate, reduced the titratable acid content and maintained a high soluble solids content. MeJA has been shown to suppress the activities and gene expressions of WSP, CSP, ISP, and cellulose in contrast to the control group, thereby maintaining a lower cell permeability and higher exocarp firmness. MeJA significantly decreased the expression of MdACS, MdACO, MdPL, Mdgal, and MdPG genes in the apple exocarp when compared to the control group. In addition, the overexpression of MdPL18 increased the content of cell wall polysaccharides such as WSP and CSP, enhanced cell wall-degrading enzyme activities, and accelerated fruit ripening and softening, whereas silencing MdPL18 did the opposite. Together, these results demonstrate that exogenous MeJA maintains the Ruixue apple fruit quality by regulating the metabolism of cell wall substances.
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Affiliation(s)
| | | | | | | | | | | | - Zhengyang Zhao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F University, Xianyang 712100, China; (X.D.); (B.W.)
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Zhang WW, Zhao SQ, Zhang LC, Xing Y, Jia WS. Changes in the cell wall during fruit development and ripening in Fragaria vesca. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 154:54-65. [PMID: 32526611 DOI: 10.1016/j.plaphy.2020.05.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 05/22/2020] [Accepted: 05/23/2020] [Indexed: 05/27/2023]
Abstract
Although fruit expansion during ripening has been extensively studied, the structural and metabolic mechanisms remain largely unknown. Here, we report the critical roles of cell separation and cell wall metabolism in the coordinated regulation of fruit expansion in Fragaria vesca. Anatomical observations indicated that a syndrome of cell separation occurred from the very earliest stage of fruit set. Cell separation led to an increase in apoplastic space, and the time course of this increase coincided with the period of fruit development and ripening. Moreover, massive cellulose disassembly occurred when cells were fully separated, which coincided with the expansion of cell and fruit volume. Consistent with the anatomical observations, both histochemistry and composition analysis indicated correlations between cell separation and the cell wall metabolism. These observations suggest that cell separation, cell elongation and cell wall disassembly occur simultaneously during fruit ripening in Fragaria vesca.
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Affiliation(s)
- Wei-Wei Zhang
- College of Horticulture, China Agricultural University, Beijing, China; Beijing Collaborative Innovation Center for Eco-Environmental Improvement with Forestry and Fruit Trees, College of Plant Science and Technology, Beijing University of Agriculture, China
| | - Shuai-Qi Zhao
- Beijing Collaborative Innovation Center for Eco-Environmental Improvement with Forestry and Fruit Trees, College of Plant Science and Technology, Beijing University of Agriculture, China
| | - Ling-Chao Zhang
- Beijing Collaborative Innovation Center for Eco-Environmental Improvement with Forestry and Fruit Trees, College of Plant Science and Technology, Beijing University of Agriculture, China
| | - Yu Xing
- Beijing Collaborative Innovation Center for Eco-Environmental Improvement with Forestry and Fruit Trees, College of Plant Science and Technology, Beijing University of Agriculture, China.
| | - Wen-Suo Jia
- College of Horticulture, China Agricultural University, Beijing, China.
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Calcium chloride and 1-methylcyclopropene treatments delay postharvest and reduce decay of New Queen melon. Sci Rep 2019; 9:13563. [PMID: 31537851 PMCID: PMC6753129 DOI: 10.1038/s41598-019-49820-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 08/30/2019] [Indexed: 11/15/2022] Open
Abstract
In this study, newly harvested New Queen melons were treated with calcium chloride (CaCl2) and 1-methylcyclopropene (1-MCP) alone or in combination before storage. The results showed that the respiration rate, ethylene release, the activity and gene expression of pectinases such as polygalacturonase (PG), pectin methylesterase (PME) and pectate lyase (PL) in New Queen melons were dramatically decreased by treatments with 0.18 mol/L CaCl2 and/or 1 μL/L 1-MCP. Meanwhile, the climacteric behavior and flesh hardness reduction were inhibited. We also found that softer melon flesh was more conducive to the growth and reproduction of decay-causing microorganisms according to their growth curves in melons that were different in flesh hardness, suggesting inhibiting fruit softening can slow down the growth of microorganisms in fruit flesh, and thus reduce fruit decay rate. The combined use of CaCl2 and 1-MCP was more effective in suppressing respiration rate, ethylene release and protopectin hydrolysis, which could greatly delay the softening, reduce the decay rate, and extend the shelf life of New Queen melons.
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Sun H, Hao P, Ma Q, Zhang M, Qin Y, Wei H, Su J, Wang H, Gu L, Wang N, Liu G, Yu S. Genome-wide identification and expression analyses of the pectate lyase (PEL) gene family in cotton (Gossypium hirsutum L.). BMC Genomics 2018; 19:661. [PMID: 30200887 PMCID: PMC6131898 DOI: 10.1186/s12864-018-5047-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 08/30/2018] [Indexed: 11/23/2022] Open
Abstract
Background Pectin is a major component and structural polysaccharide of the primary cell walls and middle lamella of higher plants. Pectate lyase (PEL, EC 4.2.2.2), a cell wall modification enzyme, degrades de-esterified pectin for cell wall loosening, remodeling and rearrangement. Nevertheless, there have been few studies on PEL genes and no comprehensive analysis of the PEL gene family in cotton. Results We identified 53, 42 and 83 putative PEL genes in Gossypium raimondii (D5), Gossypium arboreum (A2), and Gossypium hirsutum (AD1), respectively. These PEL genes were classified into five subfamilies (I-V). Members from the same subfamilies showed relatively conserved gene structures, motifs and protein domains. An analysis of gene chromosomal locations and gene duplication revealed that segmental duplication likely contributed to the expansion of the GhPELs. The 2000 bp upstream sequences of all the GhPELs contained auxin response elements. A transcriptomic data analysis showed that 62 GhPELs were expressed in various tissues. Notably, most (29/32) GhPELs of subfamily IV were preferentially expressed in the stamen, and five GhPELs of subfamily V were prominently expressed at the fiber elongation stage. In addition, qRT-PCR analysis revealed the expression characteristics of 24 GhPELs in four pollen developmental stages and significantly different expression of some GhPELs between long- and short-fiber cultivars. Moreover, some members were responsive to IAA treatment. The results indicate that GhPELs play significant and functionally diverse roles in the development of different tissues. Conclusions In this study, we comprehensively analyzed PELs in G. hirsutum, providing a foundation to better understand the functions of GhPELs in different tissues and pathways, especially in pollen, fiber and the auxin signaling pathway. Electronic supplementary material The online version of this article (10.1186/s12864-018-5047-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Huiru Sun
- College of Agronomy, Northwest A&F University, Yangling, 712100, China.,State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Pengbo Hao
- College of Agronomy, Northwest A&F University, Yangling, 712100, China.,State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Qiang Ma
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Meng Zhang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Yuan Qin
- College of Agronomy, Northwest A&F University, Yangling, 712100, China.,State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Hengling Wei
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Junji Su
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Hantao Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Lijiao Gu
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Nuohan Wang
- College of Agronomy, Northwest A&F University, Yangling, 712100, China.,State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Guoyuan Liu
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China
| | - Shuxun Yu
- College of Agronomy, Northwest A&F University, Yangling, 712100, China. .,State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang, 455000, China.
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Pectate lyase pollen allergens: sensitization profiles and cross-reactivity pattern. PLoS One 2015; 10:e0120038. [PMID: 25978036 PMCID: PMC4433284 DOI: 10.1371/journal.pone.0120038] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 01/18/2015] [Indexed: 11/23/2022] Open
Abstract
Background Pollen released by allergenic members of the botanically unrelated families of Asteraceae and Cupressaceae represent potent elicitors of respiratory allergies in regions where these plants are present. As main allergen sources the Asteraceae species ragweed and mugwort, as well as the Cupressaceae species, cypress, mountain cedar, and Japanese cedar have been identified. The major allergens of all species belong to the pectate lyase enzyme family. Thus, we thought to investigate cross-reactivity pattern as well as sensitization capacities of pectate lyase pollen allergens in cohorts from distinct geographic regions. Methods The clinically relevant pectate lyase pollen allergens Amb a 1, Art v 6, Cup a 1, Jun a 1, and Cry j 1 were purified from aqueous pollen extracts, and patients´ sensitization pattern of cohorts from Austria, Canada, Italy, and Japan were determined by IgE ELISA and cross-inhibition experiments. Moreover, we performed microarray experiments and established a mouse model of sensitization. Results In ELISA and ELISA inhibition experiments specific sensitization pattern were discovered for each geographic region, which reflected the natural allergen exposure of the patients. We found significant cross-reactivity within Asteraceae and Cupressaceae pectate lyase pollen allergens, which was however limited between the orders. Animal experiments showed that immunization with Asteraceae allergens mainly induced antibodies reactive within the order, the same was observed for the Cupressaceae allergens. Cross-reactivity between orders was minimal. Moreover, Amb a 1, Art v 6, and Cry j 1 showed in general higher immunogenicity. Conclusion We could cluster pectate lyase allergens in four categories, Amb a 1, Art v 6, Cup a 1/Jun a 1, and Cry j 1, respectively, at which each category has the potential to sensitize predisposed individuals. The sensitization pattern of different cohorts correlated with pollen exposure, which should be considered for future allergy diagnosis and therapy.
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Kumar R, Khurana A, Sharma AK. Role of plant hormones and their interplay in development and ripening of fleshy fruits. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:4561-75. [PMID: 25028558 DOI: 10.1093/jxb/eru277] [Citation(s) in RCA: 261] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Plant hormones have been extensively studied for their roles in the regulation of various aspects of plant development. However, in the last decade important new insights have been made into their action during development and ripening, in both dry and fleshy fruits. Emerging evidence suggests that relative functions of plant hormones are not restricted to a particular stage, and a complex network of more than one plant hormone is involved in controlling various aspects of fruit development. Though some areas are extensively covered, considerable gaps in our knowledge and understanding still exist in the control of hormonal networks and crosstalk between different hormones during fruit expansion, maturation, and various other aspects of ripening. Here, we evaluate the new knowledge on their relative roles during tomato fruit development with a view to understand their mechanism of action in fleshy fruits. For a better understanding, pertinent evidences available on hormonal crosstalk during fruit development in other species are also discussed. We envisage that such detailed knowledge will help design new strategies for effective manipulation of fruit ripening.
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Affiliation(s)
- Rahul Kumar
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi 110021, India. Current address: Repository of Tomato Genomics Resources, Department of Plant Sciences, University of Hyderabad, Hyderabad 500046, India
| | - Ashima Khurana
- Zakir Husain Delhi College, University of Delhi, New Delhi 110002, India
| | - Arun K Sharma
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi 110021, India.
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Guo Q, Wu B, Chen W, Zhang Y, Wang J, Li X. Effects of nitric oxide treatment on the cell wall softening related enzymes and several hormones of papaya fruit during storage. FOOD SCI TECHNOL INT 2013; 20:309-17. [DOI: 10.1177/1082013213484919] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Papaya fruits ( Carica papaya L. cv ‘Sui you 2’) harvested with <5% yellow surface at the blossom end were fumigated with 60 µL/L of nitric oxide for 3 h and then stored at 20 ℃ with 85% relative humility for 20 days. The effects of nitric oxide treatment on ethylene production rate, the activities of cell wall softening related enzymes including polygalacturonase, pectin methyl esterase, pectate lyase and cellulase and the levels of hormones including indole acetic acid, abscisic acid, gibberellin and zeatin riboside were examined. The results showed that papaya fruits treated with nitric oxide had a significantly lower rate of ethylene production and a lesser loss of firmness during storage. A decrease in polygalacturonase, pectin methyl esterase, pectate lyase and cellulase activities was observed in nitric oxide treated fruit. In addition, the contents of indole acetic acid, abscisic acid and zeatin riboside were reduced in nitric oxide treated fruit, but no significant reduction in the level of gibberellin was found. These results indicate that nitric oxide treatment can effectively delay the softening and ripening of papaya fruit, likely via the regulation of cell wall softening related enzymes and certain hormones.
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Affiliation(s)
- Qin Guo
- Guangdong Provincial Key Laboratory for Postharvest Science and Technology of Fruits and Vegetables, South China Agricultural University, Guangzhou, PR China
- Key Laboratory of Oil and Gas Fine Chemicals of the Ministry of Education, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, PR China
| | - Bin Wu
- Institute of Agro-products Storage and Processing, Xinjiang Academy of Agricultural Sciences, Urumqi, PR China
| | - Weixin Chen
- Guangdong Provincial Key Laboratory for Postharvest Science and Technology of Fruits and Vegetables, South China Agricultural University, Guangzhou, PR China
| | - Yuli Zhang
- Key Laboratory of Oil and Gas Fine Chemicals of the Ministry of Education, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, PR China
| | - Jide Wang
- Key Laboratory of Oil and Gas Fine Chemicals of the Ministry of Education, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, PR China
| | - Xueping Li
- Guangdong Provincial Key Laboratory for Postharvest Science and Technology of Fruits and Vegetables, South China Agricultural University, Guangzhou, PR China
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Aghofack-N J, Manka`abie J. Effects of Exogenously Applied Benzylaminopurine and Kinetin on the Ripening of Banana (Musa acuminata Colla var. William) Fruits. ACTA ACUST UNITED AC 2012. [DOI: 10.3923/ajpp.2012.154.163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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[Research progress on banana functional genomics involved in fruit quality]. YI CHUAN = HEREDITAS 2012; 34:412-9. [PMID: 22522158 DOI: 10.3724/sp.j.1005.2012.00412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Banana is one of the most important tropical fruits and main economical resource for tropical people. Banana quality is always becoming a focus for people to follow with interest. Here, we reviewed recent research progresses on isolation and identification of banana genes involved in fruit quality such as ripening, softening, glycometabolism, and scent, which will help us explore their functions and facilitate banana quality improvement.
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Singh B, Avci U, Eichler Inwood SE, Grimson MJ, Landgraf J, Mohnen D, Sørensen I, Wilkerson CG, Willats WGT, Haigler CH. A specialized outer layer of the primary cell wall joins elongating cotton fibers into tissue-like bundles. PLANT PHYSIOLOGY 2009; 150:684-99. [PMID: 19369592 PMCID: PMC2689960 DOI: 10.1104/pp.109.135459] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2009] [Accepted: 04/07/2009] [Indexed: 05/17/2023]
Abstract
Cotton (Gossypium hirsutum) provides the world's dominant renewable textile fiber, and cotton fiber is valued as a research model because of its extensive elongation and secondary wall thickening. Previously, it was assumed that fibers elongated as individual cells. In contrast, observation by cryo-field emission-scanning electron microscopy of cotton fibers developing in situ within the boll demonstrated that fibers elongate within tissue-like bundles. These bundles were entrained by twisting fiber tips and consolidated by adhesion of a cotton fiber middle lamella (CFML). The fiber bundles consolidated via the CFML ultimately formed a packet of fiber around each seed, which helps explain how thousands of cotton fibers achieve their great length within a confined space. The cell wall nature of the CFML was characterized using transmission electron microscopy, including polymer epitope labeling. Toward the end of elongation, up-regulation occurred in gene expression and enzyme activities related to cell wall hydrolysis, and targeted breakdown of the CFML restored fiber individuality. At the same time, losses occurred in certain cell wall polymer epitopes (as revealed by comprehensive microarray polymer profiling) and sugars within noncellulosic matrix components (as revealed by gas chromatography-mass spectrometry analysis of derivatized neutral and acidic glycosyl residues). Broadly, these data show that adhesion modulated by an outer layer of the primary wall can coordinate the extensive growth of a large group of cells and illustrate dynamic changes in primary wall structure and composition occurring during the differentiation of one cell type that spends only part of its life as a tissue.
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Affiliation(s)
- Bir Singh
- North Carolina State University, Department of Crop Science, Raleigh, North Carolina 27695-7620, USA
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Sanwal GG, Payasi A. Garlic extract plus sodium metabisulphite enhances shelf life of ripe banana fruit. Int J Food Sci Technol 2007. [DOI: 10.1111/j.1365-2621.2006.01222.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Palusa SG, Golovkin M, Shin SB, Richardson DN, Reddy ASN. Organ-specific, developmental, hormonal and stress regulation of expression of putative pectate lyase genes in Arabidopsis. THE NEW PHYTOLOGIST 2007; 174:537-550. [PMID: 17447910 DOI: 10.1111/j.1469-8137.2007.02033.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Pectate lyases catalyse the eliminative cleavage of de-esterified homogalacturonan in pectin, a major component of the primary cell walls in higher plants. In the completed genome of Arabidopsis, there are 26 genes (AtPLLs) that encode pectate lyase-like proteins. Here, we analysed the expression pattern of all AtPLLs in different organs, at different stages of seedling development and in response to various hormones and stresses. The expression of PLLs varied considerably in different organs, with no expression of some PLLs in vegetative organs. Interestingly, all PLL genes are expressed in flowers. Several PLLs are expressed highly in pollen, suggesting a role for these in pollen development and/or function. Analysis of expression of all PLL genes in seedlings treated with hormones, abiotic stresses and elicitors of defense responses revealed significant changes in the expression of some PLLs without affecting the other PLLs. The stability of transcripts of PLLs varied considerably among different genes. Our results indicate a complex regulation of expression of PLLs and involvement of PLLs in some of the hormonal and stress responses.
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Affiliation(s)
- Saiprasad Goud Palusa
- Department of Biology and Program in Molecular Plant Biology, Colorado State University, Fort Collins, CO 80523-1878, USA
| | - Maxim Golovkin
- Department of Biology and Program in Molecular Plant Biology, Colorado State University, Fort Collins, CO 80523-1878, USA
| | - Sung-Bong Shin
- Department of Biology and Program in Molecular Plant Biology, Colorado State University, Fort Collins, CO 80523-1878, USA
| | - Dale N Richardson
- Department of Biology and Program in Molecular Plant Biology, Colorado State University, Fort Collins, CO 80523-1878, USA
| | - Anireddy S N Reddy
- Department of Biology and Program in Molecular Plant Biology, Colorado State University, Fort Collins, CO 80523-1878, USA
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Payasi A, Misra PC, Sanwal GG. Purification and characterization of pectate lyase from banana (Musa acuminata) fruits. PHYTOCHEMISTRY 2006; 67:861-9. [PMID: 16554075 DOI: 10.1016/j.phytochem.2006.02.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2005] [Revised: 01/28/2006] [Accepted: 02/01/2006] [Indexed: 05/07/2023]
Abstract
Pectate lyase (PEL) has been purified by hydrophobic, cation exchange and size exclusion column chromatographies from ripe banana fruit. The purified enzyme has specific activity of 680 +/- 50 pkat mg protein(-1). The molecular mass of the enzyme is 43 kDa by SDS-PAGE. The pI of the enzyme is 8 with optimum activity at pH 8.5. Analysis of the reaction products by paper and anion exchange chromatographies reveal that the enzyme releases several oligomers of unsaturated galacturonane from polygalacturonate. The K(m) values of the enzyme for polygalacturonate and citrus pectin (7.2% methylation) are 0.40 +/- 0.04 and 0.77 +/- 0.08 g l(-1), respectively. PEL is sensitive to inhibition by different phenolic compounds, thiols, reducing agents, iodoacetate and N-bromosuccinimide. The enzyme has a requirement for Ca(2+) ions. However, Mg(2+) and Mn(2+) can substitute equally well. Additive effect on the enzyme activity was observed when any two metal ions (out of Mg(2+), Ca(2+) and Mn(2+)) are present together. The banana PEL is a enzyme requiring Mg(2+), in addition to Ca(2+), for exhibiting maximum activity.
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Affiliation(s)
- Anurag Payasi
- Department of Biochemistry, University of Lucknow, UP, India
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