Polygalacturonase: Difference between revisions
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<Structure load='1czf' size='350' frame='true' align='right' caption='Secondary structure of ''endo''-polygalacturonase II' scene='Insert optional scene name here' />Polygalacturonases (PGs) catalyze the enzymatic depolymerization of pectins – 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 pectins in plant cell walls contributes to ripening of fruits, such as tomatoes and melons (Polygalacturonases: many genes in search of a function). Microbial PGs have been identified to be a part of defense mechanisms because of their role in pathogen attack (crystal structure). | <Structure load='1czf' size='350' frame='true' align='right' caption='Secondary structure of ''endo''-polygalacturonase II' scene='Insert optional scene name here' />Polygalacturonases (PGs) catalyze the enzymatic depolymerization of pectins – 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 pectins in plant cell walls contributes to ripening of fruits, such as tomatoes and melons (Polygalacturonases: many genes in search of a function). Microbial PGs have been identified to be a part of defense mechanisms because of their role in pathogen attack (crystal structure). | ||
--MDY -- this is a bit confusing. 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. -- MDY | |||
== Function == | == Function == | ||