Polygalacturonase: Difference between revisions

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OCA, Marilyn Yoder, Krishna Amin, Michal Harel, Joel L. Sussman, Jaime Prilusky

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 <Structure load='1czf' size='350' side='right' caption='Glycosylated structure of endo-polygalacturonase II complex with Zn+2 ion (grey) (PDB code [[1czf]])'  scene=''>
-'''Polygalacturonases''' (PGs) catalyze the enzymatic depolymerization of pectates – polysaccharides that comprise the plant cell wall. Polymer disassembly of substrates by ''exo-'' and ''endo-'' PGs is carried out via a hydrolytic mechanism. Degradation of pectates in plant cell walls contributes to ripening of fruits, such as tomatoes and melons <ref>DOI: 10.1104/pp.117.2.337</ref>. Microbial PGs have been identified to be a part of defense mechanisms because of their role in pathogen attack <ref>DOI: 10.1074/jbc.273.38.24660</ref>.
+'''Polygalacturonases''' (PGs) catalyze the enzymatic depolymerization of pectates – polysaccharides that comprise the plant cell wall. Polymer disassembly of substrates by ''exo-'' and ''endo-'' PGs is carried out via a hydrolytic mechanism. Degradation of pectates in plant cell walls contributes to ripening of fruits, such as tomatoes and melons <ref>DOI: 10.1104/pp.117.2.337</ref>. Microbial PGs have been identified to be a part of defense mechanisms because of their role in pathogen attack<ref>PMID:9733763</ref>.
 PG's are found in bacteria, fungi, plants, and animals.  Plant PG's are involved in fruit ripening.  Bacteria and fungal PG are involved in plant pathogenesis, often acting as plant virulence factors and involved in some of the initial pathogenic effects through their action of degrading the plant cell wall.