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2scp

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{{STRUCTURE_2scp| PDB=2scp | SCENE= }}
{{STRUCTURE_2scp| PDB=2scp | SCENE= }}
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'''STRUCTURE OF A SARCOPLASMIC CALCIUM-BINDING PROTEIN FROM NEREIS DIVERSICOLOR REFINED AT 2.0 ANGSTROMS RESOLUTION'''
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===STRUCTURE OF A SARCOPLASMIC CALCIUM-BINDING PROTEIN FROM NEREIS DIVERSICOLOR REFINED AT 2.0 ANGSTROMS RESOLUTION===
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==Overview==
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The crystal structure of a sarcoplasmic Ca(2+)-binding protein (SCP) from the sandworm Nereis diversicolor has been determined and refined at 2.0 A resolution using restrained least-squares techniques. The two molecules in the crystallographic asymmetric unit, which are related by a non-crystallographic 2-fold axis, were refined independently. The refined model includes all 174 residues and three calcium ions for each molecule, as well as 213 water molecules. The root-mean-square difference in co-ordinates for backbone atoms and calcium ions of the two molecules is 0.51 A. The final crystallographic R-factor, based on 18,959 reflections in the range 2.0 A less than or equal to d less than or equal to 7.0 A, with intensities exceeding 2.0 sigma, is 0.182. Bond lengths and bond angles in the molecules have root-mean-square deviations from ideal values of 0.013 A and 2.2 degrees, respectively. SCP has four distinct domains with the typical helix-loop-helix (EF-hand) Ca(2+)-binding motif, although the second Ca(2+)-binding domain is not functional due to amino acid changes in the loop. The structure shows several unique features compared to other Ca(2+)-binding proteins with four EF-hand domains. The overall structure is highly compact and globular with a predominant hydrophobic core, unlike the extended dumbbell-shaped structure of calmodulin or troponin C. A hydrophobic tail at the COOH terminus adds to the structural stability by packing against a hydrophobic pocket created by the folding of the NH2 and COOH-terminal Ca(2+)-binding domain pairs. The first and second domains show different helix-packing arrangements from any previously described for Ca(2+)-binding proteins.
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{{ABSTRACT_PUBMED_1560459}}
==About this Structure==
==About this Structure==
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[[Category: Vijay-Kumar, S.]]
[[Category: Vijay-Kumar, S.]]
[[Category: Binding protein]]
[[Category: Binding protein]]
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Revision as of 09:28, 29 July 2008

Image:2scp.png

Template:STRUCTURE 2scp

STRUCTURE OF A SARCOPLASMIC CALCIUM-BINDING PROTEIN FROM NEREIS DIVERSICOLOR REFINED AT 2.0 ANGSTROMS RESOLUTION

Template:ABSTRACT PUBMED 1560459

About this Structure

2SCP is a Single protein structure of sequence from Neanthes diversicolor. This structure supersedes the now removed PDB entry 1scp. Full crystallographic information is available from OCA.

Reference

Structure of a sarcoplasmic calcium-binding protein from Nereis diversicolor refined at 2.0 A resolution., Vijay-Kumar S, Cook WJ, J Mol Biol. 1992 Mar 20;224(2):413-26. PMID:1560459

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