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EC 3.1.1.79 Details
EC number
3.1.1.79
Accepted name
hormone-sensitive lipase
Reaction
(1) diacylglycerol + H2O = monoacylglycerol + a carboxylate;;(2) triacylglycerol + H2O = diacylglycerol + a carboxylate;;(3) monoacylglycerol + H2O = glycerol + a carboxylate
Other name(s)
HSL
Systematic name
diacylglycerol acylhydrolase
Comment
This enzyme is a serine hydrolase. Compared with other lipases, hormone-sensitive lipase has a uniquely broad substrate specificity. It hydrolyses all acylglycerols (triacylglycerol, diacylglycerol and monoacylglycerol) [2,3,4] as well as cholesteryl esters [2,4], steroid fatty acid esters [5], retinyl esters [6] and p-nitrophenyl esters [4,7]. It exhibits a preference for the 1- or 3-ester bond of its acylglycerol substrate compared with the 2-ester bond [8]. The enzyme shows little preference for the fatty acids in the triacylglycerol, although there is some increase in activity with decreasing chain length. The enzyme activity is increased in response to hormones that elevate intracellular levels of cAMP.
History
created 2004
EC Tree
3.1.1.9 created 1961, deleted 1972
3.1.1.12 created 1961, deleted 1972
3.1.1.16 created 1961, deleted 1972
3.1.1.18 created 1961, deleted 1982
3.1.1.62 created 1989, deleted 1992
3.1.1.69 created 1992, deleted 2002
3.1.2.8 created 1961, deleted 1978
3.1.2.9 created 1961, deleted 1964
3.1.2.24 created 2000, deleted 2005