1qv0: Difference between revisions

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[[Image:1qv0.jpg|left|200px]]
{{Seed}}
[[Image:1qv0.png|left|200px]]


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{{STRUCTURE_1qv0|  PDB=1qv0  |  SCENE=  }}  
{{STRUCTURE_1qv0|  PDB=1qv0  |  SCENE=  }}  


'''Atomic resolution structure of obelin from Obelia longissima'''
===Atomic resolution structure of obelin from Obelia longissima===




==Overview==
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The spatial structure of the Ca(2+)-regulated photoprotein obelin has been solved to resolution of 1.1A. Two oxygen atoms are revealed substituted at the C2-position of the coelenterazine in contrast to the obelin structure at 1.73A resolution where one oxygen atom only was disclosed. The electron density of the second oxygen atom was very weak but after exposing the crystals to a trace of Ca(2+), the electron densities of both oxygen atoms became equally intense. In addition, one Ca(2+) was found bound in the loop of the first EF-hand motif. Four of the ligands were provided by protein residues Asp30, Asn32, Asn34, and the main chain oxygen of Lys36. The other two were from water molecules. From a comparison of B-factors for the residues constituting the active site, it is suggested that the variable electron densities observed in various photoprotein structures could be attributed to different mobilities of the peroxy oxygen atoms.
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(as it appears on PubMed at http://www.pubmed.gov), where 14592432 is the PubMed ID number.
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{{ABSTRACT_PUBMED_14592432}}


==About this Structure==
==About this Structure==
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[[Category: Obelin]]
[[Category: Obelin]]
[[Category: Photoprotein]]
[[Category: Photoprotein]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 06:44:08 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 09:08:56 2008''

Revision as of 06:08, 28 July 2008

File:1qv0.png

Template:STRUCTURE 1qv0

Atomic resolution structure of obelin from Obelia longissima

Template:ABSTRACT PUBMED 14592432

About this Structure

1QV0 is a Single protein structure of sequence from Obelia longissima. Full crystallographic information is available from OCA.

Reference

Atomic resolution structure of obelin: soaking with calcium enhances electron density of the second oxygen atom substituted at the C2-position of coelenterazine., Liu ZJ, Vysotski ES, Deng L, Lee J, Rose J, Wang BC, Biochem Biophys Res Commun. 2003 Nov 14;311(2):433-9. PMID:14592432

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