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4cln

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{{STRUCTURE_4cln| PDB=4cln | SCENE= }}
{{STRUCTURE_4cln| PDB=4cln | SCENE= }}
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'''STRUCTURE OF A RECOMBINANT CALMODULIN FROM DROSOPHILA MELANOGASTER REFINED AT 2.2-ANGSTROMS RESOLUTION'''
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===STRUCTURE OF A RECOMBINANT CALMODULIN FROM DROSOPHILA MELANOGASTER REFINED AT 2.2-ANGSTROMS RESOLUTION===
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==Overview==
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The crystal structure of calmodulin (Mr 16,700, 148 residues) from Drosophila melanogaster as expressed in a bacterial system has been determined and refined at 2.2-A resolution. Starting with the structure of mammalian calmodulin, we produced an extensively refitted and refined model with a conventional crystallographic R value of 0.197 for the 5,239 reflections (F greater than or equal to 2 sigma (F)) within the 10.0-2.2-A resolution range. The model includes 1,164 protein atoms, 4 calcium ions, and 78 water molecules and has root mean square deviations from standard values of 0.018 A for bond lengths and 0.043 A for angle distances. The overall structure is similar to mammalian calmodulin, with a seven-turn central helix connecting the two calcium-binding domains. The "dumb-bell" shaped molecule contains seven alpha-helices and four "EF hand" calcium-binding sites. Although the amino acid sequences of mammalian and Drosophila calmodulins differ by only three conservative amino acid changes, the refined model reveals a number of significant differences between the two structures. Superimposition of the structures yields a root mean square deviation of 1.22 A for the 1,120 equivalent atoms. The calcium-binding domains have a root mean square deviation of 0.85 A for the 353 equivalent atoms. There are also differences in the amino terminus, the bend of the central alpha-helix, and the orientations of some of the side chains.
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(as it appears on PubMed at http://www.pubmed.gov), where 1939171 is the PubMed ID number.
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{{ABSTRACT_PUBMED_1939171}}
==About this Structure==
==About this Structure==
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[[Category: Taylor, D A.]]
[[Category: Taylor, D A.]]
[[Category: Calcium binding protein]]
[[Category: Calcium binding protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 13:32:26 2008''

Revision as of 10:32, 3 July 2008

Image:4cln.png

Template:STRUCTURE 4cln

STRUCTURE OF A RECOMBINANT CALMODULIN FROM DROSOPHILA MELANOGASTER REFINED AT 2.2-ANGSTROMS RESOLUTION

Template:ABSTRACT PUBMED 1939171

About this Structure

4CLN is a Single protein structure of sequence from Drosophila melanogaster. Full crystallographic information is available from OCA.

Reference

Structure of a recombinant calmodulin from Drosophila melanogaster refined at 2.2-A resolution., Taylor DA, Sack JS, Maune JF, Beckingham K, Quiocho FA, J Biol Chem. 1991 Nov 15;266(32):21375-80. PMID:1939171

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