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'''THE LINKER OF DES-GLU84 CALMODULIN IS BENT AS SEEN IN THE CRYSTAL STRUCTURE''' | '''THE LINKER OF DES-GLU84 CALMODULIN IS BENT AS SEEN IN THE CRYSTAL STRUCTURE''' | ||
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[[Category: Raghunathan, S.]] | [[Category: Raghunathan, S.]] | ||
[[Category: Sobottk, S E.]] | [[Category: Sobottk, S E.]] | ||
[[Category: | [[Category: Calcium-binding protein]] | ||
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Revision as of 10:45, 2 May 2008
THE LINKER OF DES-GLU84 CALMODULIN IS BENT AS SEEN IN THE CRYSTAL STRUCTURE
Overview
The crystal structure of a mutant calmodulin (CaM) lacking Glu-84 has been refined to R = 0.23 using data measured to 2.9-A resolution. In native CaM the central helix is fully extended, and the molecule is dumbbell shaped. In contrast, the deletion of Glu-84 causes a bend of 95 degrees in the linker region of the central helix at Ile-85. However, EF-hand domains 1 and 2 (lobe 1,2) do not touch lobe 3,4. The length, by alpha-carbon separation, of des-Glu84-CaM is 56 A; that of native CaM is 64 A. The shape of des-Glu84-CaM is similar to that of native CaM, as it is bound to the target peptide of myosin light-chain kinase. This result supports the proposal that the linker region of the central helix of CaM functions as a flexible tether.
About this Structure
1DEG is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.
Reference
The linker of des-Glu84-calmodulin is bent., Raghunathan S, Chandross RJ, Cheng BP, Persechini A, Sobottka SE, Kretsinger RH, Proc Natl Acad Sci U S A. 1993 Jul 15;90(14):6869-73. PMID:8341712 Page seeded by OCA on Fri May 2 13:45:35 2008
