4be4

Closed conformation of O. piceae sterol esterase

spinqualitylabelsall models 4be4, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4be4 is a 1 chain structure with sequence from Ophiostoma piceae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.6Å Ligands: DIO, GOL, MES, NAG, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q2TFW1_9PEZI Publication Abstract from PubMed Sterol esterases are able to efficiently hydrolyze both sterol esters and triglycerides and to carry out synthesis reactions in the presence of organic solvents. Their high versatility makes them excellent candidates for biotechnological purposes. Sterol esterase from fungus Ophiostoma piceae (OPE) belongs to the family abH03.01 of the Candida rugosa lipase-like proteins. Crystal structures of OPE were solved in this study for the closed and open conformations. Enzyme activation involves a large displacement of the conserved lid, structural rearrangements of loop alpha16-alpha17, and formation of a dimer with a large opening. Three PEG molecules are placed in the active site, mimicking chains of the triglyceride substrate, demonstrating the position of the oxyanion hole and the three pockets that accommodate the sn-1, sn-2 and sn-3 fatty acids chains. One of them is an internal tunnel, connecting the active center with the outer surface of the enzyme 30A far from the catalytic Ser220. Based on our structural and biochemical results we propose a mechanism by which a great variety of different substrates can be hydrolyzed in OPE paving the way for the construction of new variants to improve the catalytic properties of these enzymes and their biotechnological applications. Crystal structures of Ophiostoma piceae sterol esterase: Structural insights into activation mechanism and product release.,Gutierrez-Fernandez J, Vaquero ME, Prieto A, Barriuso J, Martinez MJ, Hermoso JA J Struct Biol. 2014 Sep;187(3):215-22. doi: 10.1016/j.jsb.2014.07.007. Epub 2014 , Aug 7. PMID:25108239 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cholesterol esterase 3D structures

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