zymogen
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Zymogen
A zymogen (or proenzyme) is an inactive enzyme precursor. A zymogen requires a biochemical change (such as a hydrolysis reaction revealing the active site, or changing the configuration to reveal the active site) for it to become an active enzyme. The biochemical change usually occurs in a lysosome where a specific part of the precursor enzyme is cleaved in order to activate it. The inactivating piece which is cleaved off can be a peptide unit, or can be independently folding domains comprising more than 100 residues. Although they limit the enzymes ability, these n-terminal extensions of the enzyme or a “prosegment” often aid in the stabilizing and folding of the enzyme they inhibit.

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Zymogen
Zymogene (oder Proenzyme) sind inaktive Enzymvorstufen (z. B. Pepsinogen, Chymotrypsinogen). Sie werden durch Proteasen (z. B. Enteropeptidase), das Enzym selbst (Autokatalyse z. B. bei Trypsin) oder chemische Verbindungen (z. B. HCl bei Pepsinogen in Pepsin) in die aktive Form überführt.

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Proenzym
Proenzym, dawna nazwa zymogen - nieaktywny prekursor enzymu, wymagający do uaktywnienia jakiejś zmiany (np. hydrolizy fragmentu cząsteczki przesłaniającej aktywne centrum enzymu). Przykładami proenzymów są:

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ZYMOGEN
ZIMOGENO. PROENZIMA

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zymogen
zymogenesis 酶生成


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