1cki
RECOMBINANT CASEIN KINASE I DELTA TRUNCATION MUTANT CONTAINING RESIDUES 1-317
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OverviewOverview
The three-dimensional structure for the catalytic region of the mammalian, protein kinase, casein kinase I delta (CKI delta), has been solved by, X-ray crystallography to a resolution of 2.3 A. A truncation mutant of CKI, delta lacking the C-terminal autoinhibitory region was expressed in, Escherichia coli, purified, and crystallized. The structure was solved by, molecular replacement using the crystal structure of the catalytic domain, of a CKI homolog from Schizosaccharomyces pombe, Cki1. A tungstate, derivative confirmed the initial molecular replacement solution and, identified an anion binding site which may contribute to the unique, substrate specificity of CKI. Like other protein kinases, the catalytic, domain of CKI is composed of two lobes with a cleft between them for, binding ATP. Comparison of the mammalian and yeast CKI structures suggests, that a rotation of the N-terminal domain occurs upon ATP binding. This, domain motion is similar, but not identical, to that observed in, cAMP-dependent protein kinase upon binding ATP. Although Cki1 has many, similarities to CKI delta over the catalytic domain, these two forms of, CKI likely perform different functions in vivo. Relating the primary, sequences of other CKI enzymes to the three-dimensional architecture of, CKI delta reveals a catalytic face that is especially conserved among the, subset of CKI family members associated with the regulation of DNA repair.
About this StructureAbout this Structure
1CKI is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.
ReferenceReference
Three-dimensional structure of mammalian casein kinase I: molecular basis for phosphate recognition., Longenecker KL, Roach PJ, Hurley TD, J Mol Biol. 1996 Apr 5;257(3):618-31. PMID:8648628
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