1.72 A resolution refinement of the trigonal form of bovine pancreatic phospholipase A2.Sekar, K., Sekharudu, C., Tsai, M.D., Sundaralingam, M.
(1998) Acta Crystallogr.,Sect.D 54: 342-346
- PubMed: 9761901
- PubMed Abstract:
- Phospholipase A2 Engineering. Deletion of the C-Terminus Segment Changes Substrate Specificity and Uncouples Calcium and Substrate Binding at the Zwitterionic Interface
Huang, B.,Yu, B.Z.,Rogers, J.,Byeon, I.J.,Sekar, K.,Chen, X.,Sundaralingam, M.,Tsai, M.D.,Jain, M.K.
(1996) Biochemistry 35: 12164
- Phospholipase A2 Engineering. Structural and Functional Roles of the Highly Conserved Active Site Residue Aspartate-99
Sekar, K.,Yu, B.Z.,Rogers, J.,Lutton, J.,Liu, X.,Chen, X.,Tsai, M.D.,Jain, M.K.,Sundaralingam, M.
(1997) Biochemistry 36: 3104
- Phospholipase A2 Engineering. X-Ray Structural and Functional Evidence for the Interaction of Lysine-56 with Substrates
Noel, J.P.,Bingman, C.A.,Deng, T.L.,Dupureur, C.M.,Hamilton, K.J.,Jiang, R.T.,Kwak, J.G.,Sekharudu, C.,Sundaralingam, M.,Tsai, M.D.
(1991) Biochemistry 30: 11801
- Crystal Structure of the Complex of Bovine Pancreatic Phospholipase A2 with a Transition State Analogue
Sekar, K.,Kumar, A.,Liu, X.,Tsai, M.-D.,Gelb, M.H.,Sundaralingam, M.
() TO BE PUBLISHED --: --
The trigonal crystal structure of the recombinant bovine pancreatic phospholipase A2 has been re-refined at a slightly higher resolution (1.72 A). The crystals are trigonal, space group P3121, unit-cell parameters a = b = 46.78 and c = 102.89 A and a ...
The trigonal crystal structure of the recombinant bovine pancreatic phospholipase A2 has been re-refined at a slightly higher resolution (1.72 A). The crystals are trigonal, space group P3121, unit-cell parameters a = b = 46.78 and c = 102.89 A and are isomorphous to the previous structure. The structure was refined to a final crystallographic R value of 19.5% (Rfree = 28.4%) using 10 531 reflections. A total of 106 solvent molecules were included in the refinement compared with the earlier refinement which contains only 85 water molecules and 8 925 reflections at 1.8 A resolution. The root-mean-square deviation from the ideal bond lengths and bond angles is considerably better in the present refinement. The active site is extended ( approximately 14 A) from Ala1 to the calcium. The three catalytic residues (Asp99, His48 and the catalytic water) are connected by the conserved structural water and the N-terminal Ala1 on one side, and by the calcium through an equatorial water on the other. The water molecules play a role in the activity of the enzyme PLA2. The Ala1 end of the extended active site performs the activation of the phospholid membranes while the opposite end performs the hydrolysis of the monomeric phospholids.
Biological Macromolecular Structure Center, Departments of Chemistry and Biochemistry and the Ohio State Biochemistry Program, 100 West 18th Avenue, The Ohio State University, Columbus, OH 43210, USA.