5lip | pdb_00005lip

PSEUDOMONAS LIPASE COMPLEXED WITH RC-(RP, SP)-1,2-DIOCTYLCARBAMOYLGLYCERO-3-O-OCTYLPHOSPHONATE

spinqualitylabelsall models 5lip, resolution 2.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5lip is a 1 chain structure with sequence from Burkholderia cepacia. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, OCP Activity: Triacylglycerol lipase, with EC number 3.1.1.3 Resources: FirstGlance, OCA, RCSB, PDBsum Function [LIP_BURCE] Catalyzes the hydrolysis of triglycerides. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed To investigate the enantioselectivity of Pseudomonas cepacia lipase, inhibition studies were performed with Sc- and Rc-(Rp,Sp)-1,2-dialkylcarbamoylglycero-3-O-p-nitrophenyl alkylphosphonates of different alkyl chain lengths. P. cepacia lipase was most rapidly inactivated by Rc-(Rp,Sp)-1,2-dioctylcarbamoylglycero-3-O-p-nitrophenyl octylphosphonate (Rc-trioctyl) with an inactivation half-time of 75 min, while that for the Sc-(Rp,Sp)-1,2-dioctylcarbamoylglycero-3-O-p-nitrophenyl octyl-phosphonate (Sc-trioctyl) compound was 530 min. X-ray structures were obtained of P. cepacia lipase after reaction with Rc-trioctyl to 0.29-nm resolution at pH 4 and covalently modified with Rc-(Rp,Sp)-1,2-dibutylcarbamoylglycero-3-O-p-nitrophenyl butyl-phosphonate (Rc-tributyl) to 0.175-nm resolution at pH 8.5. The three-dimensional structures reveal that both triacylglycerol analogues had reacted with the active-site Ser87, forming a covalent complex. The bound phosphorus atom shows the same chirality (Sp) in both complexes despite the use of a racemic (Rp,Sp) mixture at the phosphorus atom of the triacylglycerol analogues. In the structure of Rc-tributyl-complexed P. cepacia lipase, the diacylglycerol moiety has been lost due to an aging reaction, and only the butyl phosphonate remains visible in the electron density. In the Rc-trioctyl complex the complete inhibitor is clearly defined; it adopts a bent tuning fork conformation. Unambiguously, four binding pockets for the triacylglycerol could be detected: an oxyanion hole and three pockets which accommodate the sn-1, sn-2, and sn-3 fatty acid chains. Van der Waals' interactions are the main forces that keep the radyl groups of the triacylglycerol analogue in position and, in addition, a hydrogen bond to the carbonyl oxygen of the sn-2 chain contributes to fixing the position of the inhibitor. Structural basis of the chiral selectivity of Pseudomonas cepacia lipase.,Lang DA, Mannesse ML, de Haas GH, Verheij HM, Dijkstra BW Eur J Biochem. 1998 Jun 1;254(2):333-40. PMID:9660188 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Lipase

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