1psb
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(New page: 200px<br /> <applet load="1psb" size="450" color="white" frame="true" align="right" spinBox="true" caption="1psb" /> '''Solution structure of calcium loaded S100B ...)
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Revision as of 16:40, 12 November 2007
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Solution structure of calcium loaded S100B complexed to a peptide from N-Terminal regulatory domain of NDR kinase.
Overview
NDR, a nuclear serine/threonine kinase, belongs to the subfamily of Dbf2, kinases that is critical to the morphology and proliferation of cells. The, activity of NDR kinase is modulated in a Ca(2+)/S100B-dependent manner by, phosphorylation of Ser281 in the catalytic domain and Thr444 in the, C-terminal regulatory domain. S100B, which is a member of the S100, subfamily of EF-hand proteins, binds to a basic/hydrophobic sequence at, the junction of the N-terminal regulatory and catalytic domains, (NDR(62-87)). Unlike calmodulin-dependent kinases, regulation of NDR by, S100B is not associated with direct autoinhibition of the active site, but, rather involves a conformational change in the catalytic domain triggered, by Ca(2+)/S100B binding to the junction region. To gain further insight, into the mechanism of activation of the kinase, studies have been carried, out on Ca(2+)/S100B in complex with the intact N-terminal regulatory, domain, NDR(1-87). Multidimensional heteronuclear NMR analysis showed that, the binding mode and stoichiometry of a peptide fragment of NDR, (NDR(62-87)) is the same as for the intact N-terminal regulatory domain., The solution structure of Ca(2+)/S100B and NDR(62-87) has been determined., One target molecule is found to associate with each subunit of the S100B, dimer. The peptide adopts three turns of helix in the bound state, and the, complex is stabilized by both hydrophobic and electrostatic interactions., These structural studies, in combination with available biochemical data, have been used to develop a model for calcium-induced activation of NDR, kinase by S100B.
About this Structure
1PSB is a Protein complex structure of sequences from Bos taurus. Full crystallographic information is available from OCA.
Reference
Structure of the Ca2+/S100B/NDR kinase peptide complex: insights into S100 target specificity and activation of the kinase., Bhattacharya S, Large E, Heizmann CW, Hemmings B, Chazin WJ, Biochemistry. 2003 Dec 16;42(49):14416-26. PMID:14661952
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