trypsinogen การใช้

• Trypsin is produced as the inactive zymogen trypsinogen in the pancreas.
• Auto catalysis can happen with trypsin using trypsinogen as the substrate.
• The newborn screen initially measures for raised blood concentration of immunoreactive trypsinogen.
• Proteases, the enzymes involved in the digestion of proteins, include trypsinogen and chymotrypsinogen.
• Once in the small intestine, the enzyme enteropeptidase activates trypsinogen into trypsin by proteolytic cleavage.
• The major proteases, the pancreatic enzymes which work on proteins, are trypsinogen and chymotrypsinogen.
• This gene encodes a trypsinogen, which is a member of the trypsin family of serine proteases.
• There is an inherited form that results in the activation of trypsinogen within the pancreas, leading to autodigestion.
• This gene and several other trypsinogen genes are localized to the T cell receptor beta locus on chromosome 7.
• The free trypsin then cleaves the rest of the trypsinogen, as well as chymotrypsinogen to its active form chymotrypsin.
• In the 1950s, cattle trypsinogen was shown to be activated autocatalytically by cleavage of an N-terminal hexapeptide.
• Trypsinogen is normally created and stored an inactive zymogen of trypsin in the pancreas, but occasionally will autoactivate itself.
• The proenzymes are cleaved, creating a cascade of activating enzymes : enteropeptidase activates the proenzyme trypsinogen by cleaving it to form trypsin.
• Trypsin is produced, stored and released as the inactive trypsinogen to ensure that the protein is only activated in the appropriate location.
• Trypsinogen is stored in intracellular vesicles in the pancreas called zymogen granules whose membranous walls are thought to be resistant to enzymatic degradation.
• Generally favours hydrophobic residues in P1 and P1', but also accepts Lys in P1, which leads to activation of trypsinogen.
• The zymogen of trypsin is trypsinogen, which is activated by a very specific protease, enterokinase, secreted by the mucosa of the duodenum.
• The Arctic cod's gene, however, shows no similarity to trypsinogen, apparently having evolved from some other, still unidentified, gene.
• In normal pancreas, around 5 % of trypsinogens are thought to get activated, therefore there are a number of defenses against such inappropriate activation.
• The debate of whether enterokinase was a cofactor or enzyme was resolved by Kunitz, who showed that the activation of trypsinogen by enterokinase was catalytic.