The crystal structure of a binary complex of the porcine heart catalytic (C) subunit of cAMP-dependent protein kinase (space group P4(1)32; a = 171.5 A) complexed with a di-iodinated peptide inhibitor, PKI(5-24), has been solved and refined to 2.9 A reso ...
The crystal structure of a binary complex of the porcine heart catalytic (C) subunit of cAMP-dependent protein kinase (space group P4(1)32; a = 171.5 A) complexed with a di-iodinated peptide inhibitor, PKI(5-24), has been solved and refined to 2.9 A resolution with an overall R of 21.1%. The r.m.s. deviations from ideal bond lengths and angles are 0.022 A and 4.3 degrees. A single isotropic B of 17 A(2) was used for all atoms. The structure solution was carried out initially by molecular replacement of electron density followed by refinement against atomic coordinates from orthorhombic crystals of a binary complex of the mouse recombinant enzyme previously described [Knighton, Zheng, Ten Eyck, Ashford, Xuong, Taylor & Sowadski (1991). Science, 253, 407-414]. The most striking difference between the two crystal structures is a large displacement of the small lobe of the enzyme. In the cubic crystal, the beta-sheet of the small lobe is rotated by 15 degrees and translated by 1.9 A with respect to the orthorhombic crystal. Possible explanations for why this binary complex crystallized in an open conformation in contrast to a similar binary complex of the recombinant enzyme are discussed. This study demonstrates that considerable information about parts of a crystal structure can be obtained without a complete crystal structure analysis. Specifically, the six rigid-group parameters of a poly alanine model of the beta-structure were obtained satisfactorily from a crystal structure by refinement of difference Fourier coefficients based on an approximate partial structure model.
Related Citations:
Crystal-Structure of the Catalytic Subunit of Camp-Dependent Protein-Kinase Complexed with a Mgatp and Peptide Inhibitor Zheng, J., Knighton, D.R., Xuong, N.-H., Eyck, L.F.T., Karlsson, R., Taylor, S.S., Sowadski, J.M. (1993) Biochemistry 32: 2154
2.0 Angstroms Refined Crystal Structure of the Catalytic Subunit of Camp-Dependent Protein Kinase Complexed with a Peptide Inhibitor and Detergent Knighton, D.R., Bell, S.M., Zheng, J., Eyck, L.F.T., Xuong, N.-H., Taylor, S.S., Sowadski, J.M. (1993) Acta Crystallogr D Biol Crystallogr 49: 357
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Structure of a Peptide Inhibitor Bound to the Catalytic Subunit of Cyclic Adenosine Monophosphate-Dependent Protein Kinase Knighton, D.R., Zheng, J., Eyck, L.F.T., Xuong, N.-H., Taylor, S.S., Sowadski, J.M. (1991) Science 253: 414
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Organizational Affiliation:
Department of Medicine, University of California, San Diego, La Jolla 92093-0654, USA.
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