A STRUCTURAL MODEL OF MONOACYLGLYCEROL AND DIACYLGLYCEROL LIPASE FROM PENICILLIUM-CAMEMBERTII

The amino acid sequence of lipase from Penicillium camembertii was aligned with Rhizomucor miehei lipase without permitting any deletion or insertion in the structurally conserved regions. This lipase was classified into the R. miehei lipase family, because 33% of the residues were identical and 18% of the exchanges were conserved. A graphic molecular model for P. camembertii lipase was built using information from the sequence and X-ray structure of R. miehei lipase. The primary specificity pocket in the model of P. camembertii lipase predicted a substrate preference for monoacylglycerols and diacylglycerols. The close region to reactive His259 in P. camembertii lipase, which located in the opposite shore to the helical lid that was predictable to move in the activated state, contributed to the decision of the unique substrate specificity.