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| - | [[Image:1b8c.gif|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_1b8c| PDB=1b8c | SCENE= }} | | {{STRUCTURE_1b8c| PDB=1b8c | SCENE= }} |
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| - | '''PARVALBUMIN'''
| + | ===PARVALBUMIN=== |
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| - | ==Overview==
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| - | BACKGROUND: The EF-hand family is a large set of Ca(2+)-binding proteins that contain characteristic helix-loop-helix binding motifs that are highly conserved in sequence. Members of this family include parvalbumin and many prominent regulatory proteins such as calmodulin and troponin C. EF-hand proteins are involved in a variety of physiological processes including cell-cycle regulation, second messenger production, muscle contraction, microtubule organization and vision. RESULTS: We have determined the structures of parvalbumin mutants designed to explore the role of the last coordinating residue of the Ca(2+)-binding loop. An E101D substitution has been made in the parvalbumin EF site. The substitution decreases the Ca(2+)-binding affinity 100-fold and increases the Mg(2+)-binding affinity 10-fold. Both the Ca(2+)- and Mg(2+)-bound structures have been determined, and a structural basis has been proposed for the metal-ion-binding properties. CONCLUSIONS: The E101D mutation does not affect the Mg(2+) coordination geometry of the binding loop, but it does pull the F helix 1.1 A towards the loop. The E101D-Ca(2+) structure reveals that this mutant cannot obtain the sevenfold coordination preferred by Ca(2+), presumably because of strain limits imposed by tertiary structure. Analysis of these results relative to previously reported structural information supports a model wherein the characteristics of the last coordinating residue and the plasticity of the Ca(2+)-binding loop delimit the allowable geometries for the coordinating sphere.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_10545326}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 10545326 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_10545326}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Ef-hand protein]] | | [[Category: Ef-hand protein]] |
| | [[Category: Parvalbumin]] | | [[Category: Parvalbumin]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 11:11:48 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 18:32:42 2008'' |
Revision as of 15:32, 30 June 2008
Template:STRUCTURE 1b8c
PARVALBUMIN
Template:ABSTRACT PUBMED 10545326
About this Structure
1B8C is a Single protein structure of sequence from Cyprinus carpio. Full crystallographic information is available from OCA.
Reference
Metal-ion affinity and specificity in EF-hand proteins: coordination geometry and domain plasticity in parvalbumin., Cates MS, Berry MB, Ho EL, Li Q, Potter JD, Phillips GN Jr, Structure. 1999 Oct 15;7(10):1269-78. PMID:10545326
Page seeded by OCA on Mon Jun 30 18:32:42 2008
