bcm25 zymogens Flashcards
zymogens
digestive enzymes secreted as inactive precursor zymogens
chymotrypsinogen
zymogen to digestive enzyme chymotrypsin
where is chymotrypin found?
pancreas
why must chymotrypsinogen be in zymogen form?
until it reaches digestive tract to prevent damage
why does zymogen have low activity?
due to distorted active site
what is chymotrypsin
a protease
what is chymotrypsins active site
a catalytic triad
why is chymotrypsin zymogen activated by
trypsin
what are proteases activated by and where
zymogen cascade in duodenum - 1st section of small intestine
trypsingogen -> trypsin
enteropeptidase
cleaves n terminus of trypsin
chymotrypsinogen-> chymotrypsin
trypsin
how does trypsin activate chymotrypsin
by cleaving out ser asn and arginine so isoleucine swings into active site = increase activity
what does trypsin to do trypsinogen?
cleaves out tap = trypsin activation protein to activate trypsin