1kvy
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CARBOXYLIC ESTER HYDROLASE, SINGLE MUTANT D49E COORDINATED TO CALCIUM
OverviewOverview
Crystal structures of the active-site mutants D99A and H48Q and the calcium-loop mutant D49E of bovine phospholipase A2 have been determined at around 1.9 A resolution. The D99A mutant is isomorphous to the orthorhombic recombinant enzyme, space group P212121. The H48Q and the calcium-loop mutant D49E are isomorphous to the trigonal recombinant enzyme, space group P3121. The two active-site mutants show no major structural perturbations. The structural water is absent in D99A and, therefore, the hydrogen-bonding scheme is changed. In H48Q, the catalytic water is present and hydrogen bonded to Gln48 N, but the second water found in native His48 is absent. In the calcium-loop mutant D49E, the two water molecules forming the pentagonal bipyramid around calcium are absent and only one O atom of the Glu49 carboxylate group is coordinated to calcium, resulting in only four ligands.
About this StructureAbout this Structure
1KVY is a Single protein structure of sequence from Bos taurus with as ligand. Active as Phospholipase A(2), with EC number 3.1.1.4 Full crystallographic information is available from OCA.
ReferenceReference
Structures of the catalytic site mutants D99A and H48Q and the calcium-loop mutant D49E of phospholipase A2., Sekar K, Biswas R, Li Y, Tsai M, Sundaralingam M, Acta Crystallogr D Biol Crystallogr. 1999 Feb;55(Pt 2):443-7. PMID:10089353
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