4tgl

CATALYSIS AT THE INTERFACE: THE ANATOMY OF A CONFORMATIONAL CHANGE IN A TRIGLYCERIDE LIPASE

spinqualitylabelsall models 4tgl, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4tgl is a 1 chain structure with sequence from Rhizomucor miehei. 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: DEP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function LIP_RHIMI 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 The crystal structure of an extracellular triglyceride lipase (from a fungus Rhizomucor miehei) inhibited irreversibly by diethyl p-nitrophenyl phosphate (E600) was solved by X-ray crystallographic methods and refined to a resolution of 2.65 A. The crystals are isomorphous with those of n-hexylphosphonate ethyl ester/lipase complex [Brzozowski, A. M., Derewenda, U., Derewenda, Z. S., Dodson, G. G., Lawson, D. M., Turkenburg, J. P., Bjorkling, F., Huge-Jensen, B., Patkar, S. A., & Thim, L. (1991) Nature 351, 491-494], where the conformational change was originally observed. The higher resolution of the present study allowed for a detailed analysis of the stereochemistry of the change observed in the inhibited enzyme. The movement of a 15 amino acid long "lid" (residues 82-96) is a hinge-type rigid-body motion which transports some of the atoms of a short alpha-helix (residues 85-91) by over 12 A. There are two hinge regions (residues 83-84 and 91-95) within which pronounced transitions of secondary structure between alpha and beta conformations are caused by dramatic changes of specific conformational dihedral angles (phi and psi). As a result of this change a hydrophobic area of ca. 800 A2 (8% of the total molecule surface) becomes exposed. Other triglyceride lipases are also known to have "lids" similar to the one observed in the R. miehei enzyme, and it is possible that the general stereochemistry of lipase activation at the oil-water interfaces inferred from the present X-ray study is likely to apply to the entire family of lipases. Catalysis at the interface: the anatomy of a conformational change in a triglyceride lipase.,Derewenda U, Brzozowski AM, Lawson DM, Derewenda ZS Biochemistry. 1992 Feb 11;31(5):1532-41. PMID:1737010 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Lipase 3D Structures

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