|SMART accession number:||SM00023|
|Description:||Colipase is a protein that functions as a cofactor for pancreatic lipase, with which it forms a stoichiometric complex. It also binds to the bile-salt covered triacylglycerol interface thus allowing the enzyme to anchor itself to the water-lipid interface. Colipase is a small protein of approximately 100 amino-acid residues with five conserved disulfide bonds.|
|Interpro abstract (IPR001981):|
Colipase [(PUBMED:1567900), (PUBMED:3147715)] is a small protein cofactor needed by pancreatic lipase for efficient dietary lipid hydrolyisis. It also binds to the bile-salt covered triacylglycerol interface, thus allowing the enzyme to anchor itself to the water-lipid interface. Efficient absorption of dietary fats is dependent on the action of pancreatic triglyceride lipase. Colipase binds to the C-terminal, non-catalytic domain of lipase, thereby stabilising as active conformation and considerably increasing the overall hydrophobic binding site. Structural studies of the complex and of colipase alone have revealed the functionality of its architecture [(PUBMED:9240923), (PUBMED:10570245)].
Colipase is a small protein with five conserved disulphide bonds. Structural analogies have been recognised between a developmental protein (Dickkopf), the pancreatic lipase C-terminal domain, the N-terminal domains of lipoxygenases and the C-terminal domain of alpha-toxin. These non-catalytic domains in the latter enzymes are important for interaction with membrane. It has not been established if these domains are also involved in eventual protein cofactor binding as is the case for pancreatic lipase [(PUBMED:10570245)].
|GO process:||digestion (GO:0007586), lipid catabolic process (GO:0016042)|
|GO component:||extracellular region (GO:0005576)|
|GO function:||enzyme activator activity (GO:0008047)|
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