1y6o

Crystal structure of disulfide engineered porcine pancreatic phospholipase A2 to group-X isozyme in complex with inhibitor MJ33 and phosphate ions

spinqualitylabelsall models 1y6o, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1y6o is a 2 chain structure with sequence from Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, MJI, PO4 Related: 1y6p, 1fxf, 1le6 Gene: PLA2G1B (Sus scrofa) Activity: Phospholipase A(2), with EC number 3.1.1.4 Resources: FirstGlance, OCA, RCSB, PDBsum Function [PA21B_PIG] PA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. 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 family of secreted 14 kDa phospholipase A(2) (PLA2) enzymes have a common motif for the catalytic site but differ in their disulfide architecture. The functional significance of such structural changes has been analyzed by comparing the kinetic and spectroscopic properties of a series of disulfide mutants engineered into the sequence of pig pancreatic IB PLA2 to resemble the mammalian paralogues of the PLA2 family [Janssen et al. (1999) Eur. J. Biochem. 261, 197-207, 1999]. We report a detailed comparison of the functional parameters of pig iso-PLA2, as well as several of the human homologues, with these disulfide engineered mutants of pig IB PLA2. The crystal structure of the ligand free and the active site inhibitor-MJ33 bound forms of PLA2 engineered to have the disulfide bonding pattern of group-X (eng-X) are also reported and compared with the structure of group-IB and human group-X PLA2. The engineered mutants show noticeable functional differences that are rationalized in terms of spectroscopic properties and the differences detected in the crystal structure of eng-X. A major difference between the eng-mutants is in the calcium binding to the enzyme in the aqueous phase, which also influences the binding of the active site directed ligands. We suggest that the disulfide architecture of the PLA2 paralogues has a marginal influence on interface binding. In this comparison, the modest differences observed in the interfacial kinetics are attributed to the changes in the side chain residues. This in turn influences the coupling of the catalytic cycle to the calcium binding and the interfacial binding event. Kinetic and structural properties of disulfide engineered phospholipase A2: insight into the role of disulfide bonding patterns.,Yu BZ, Pan YH, Janssen MJ, Bahnson BJ, Jain MK Biochemistry. 2005 Mar 8;44(9):3369-79. PMID:15736947 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Phospholipase A2

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