Selection Criteria: structures with acceptable covalent geometry,structures with favorable
non-bond energy,structures with the least restraint violations
Calcium-dependent protein kinases (CDPKs) are an extensive class of multidomain Ca(2+)-regulated enzymes from plants and protozoa. In vivo the so-called calmodulin-like domain (CLD) of CDPK binds intramolecularly to the junction domain (JD), which exhibits both kinase-inhibitory and CLD binding properties ...
Calcium-dependent protein kinases (CDPKs) are an extensive class of multidomain Ca(2+)-regulated enzymes from plants and protozoa. In vivo the so-called calmodulin-like domain (CLD) of CDPK binds intramolecularly to the junction domain (JD), which exhibits both kinase-inhibitory and CLD binding properties. Here we report the high resolution solution structure of the calcium-regulatory region from soybean CDPK-alpha determined in the presence of a peptide encompassing the JD. The structure of both lobes of CLD resembles that of related helix-loop-helix Ca(2+)-binding proteins. NMR chemical shift mapping studies demonstrate that the JD induces significant structural changes in isolated Ca(2+)-CLD, particularly the C-terminal domain, although a stable complex is not formed. A CLD solution structure calculated on the basis of NMR data and long range fluorescence resonance energy transfer distances reveals an activated state with both lobes positioned side by side, similar to calcineurin B rather than calmodulin, highlighting the possible pitfall of assigning function purely from sequence information.
Related Citations:
Conformational changes in the Ca2+-regulatory region from soybean calcium-dependent
protein kinase-alpha: fluorescence resonance energy transfer studies Weljie, A.M., Robertson, K.M., Vogel, H.J. (2003) J Biol Chem 278: 43764
Solution Structure and Backbone Dynamics of the N-Terminal Region of the Calcium Regulatory Domain from Soybean Calcium-Dependent Protein Kinase alpha Weljie, A.M., Gagne, S.M., Vogel, H.J. (2004) Biochemistry 42: 15131
A calcium-dependent protein kinase with a regulatory domain similar to calmodulin Harper, J.F., Sussman, M.R., Schaller, G.E., Putnam-Evans, C., Charbonneau, H., Harmon, A.C. (1991) Science 252: 951
Organizational Affiliation:
Structural Biology Research Group, Department of Biological Sciences, University of Calgary, 2500 University Dr. N. W., Calgary, Alberta T2N 1N4, Canada.
Selection Criteria: structures with acceptable covalent geometry,structures with favorable
non-bond energy,structures with the least restraint violations
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