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proteolysis |
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proteolysisProcess in which a protein is broken down partially, into peptides, or completely, into amino acids, by proteolytic enzymes, present in bacteria and in plants but most abundant in animals. Proteins in food are attacked in the stomach by pepsin and in the small intestine mainly by trypsin and chymotrypsin from the pancreas. Proteolytic enzymes are secreted as zymogens, which are themselves converted by proteolysis to their active forms. Many other zymogens or precursors undergo proteolysis to form active enzymes or proteins (e.g., fibrinogen to fibrin). In cells, proteolytic degradation of old proteins is part of cellular maintenance. proteolysis [‚prōd·ē′äl·ə·səs] (biochemistry) Fragmentation of a protein molecule by addition of water to the peptide bonds. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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5) In PSP, this protein becomes resistant to proteolysis and is partially crystallized, forming abnormal deposits of tangled fibers, which are called neurofibrillary tangles. Calpain exhibits relative selectivity for proteolysis of a subset of cellular proteins. Thiex, senior neurosurgeon in the Department of Neurosurgery at Aachen University Hospital reported on new results on applying PAION's clot busting drug Desmoteplase in a large animal model of haemorrhagic stroke at the 18th International Congress on Fibrinolysis and Proteolysis in San Diego, CA (USA) (Thiex R, Weis J, Schwartz O, Krings T, Rohde V: Minor Edema Formation after DSPA-induced Clot Lysis of Experimental Intracerebral Hemorrhage. |
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