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2j96

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[[Image:2j96.gif|left|200px]]
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{{STRUCTURE_2j96| PDB=2j96 | SCENE= }}
{{STRUCTURE_2j96| PDB=2j96 | SCENE= }}
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'''THE E-CONFIGURATION OF ALFA-PHYCOERYTHROCYANIN'''
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===THE E-CONFIGURATION OF ALFA-PHYCOERYTHROCYANIN===
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==Overview==
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Phycobiliproteins and phytochromes are light-harvesting and light-sensing proteins containing linear tetrapyrroles, so-called bile chromophores. The chromophores in certain biliproteins, including the phytochromes, isomerize reversibly from a stable Z-configuration to a stable E-configuration when irradiated with light of the appropriate wavelength. Here, we report the crystal structure of alpha-phycoerythrocyanin with its chromophore in the E-configuration, compare it with the Z-configuration found in trimeric phycoerythrocyanin, and reveal the structural bases of the isomerization. The geometric changes of the chromophore account for the large spectral shift, which characterizes the overall transition. Interactions of the chromophore A and D pyrrole rings with flexible protein moieties are required for the formation and stabilization of the isomers. We predict that the results will hold for all photoactive biliproteins.
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(as it appears on PubMed at http://www.pubmed.gov), where 17209552 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17209552}}
==About this Structure==
==About this Structure==
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[[Category: Transport]]
[[Category: Transport]]
[[Category: Z- to e-isomerization]]
[[Category: Z- to e-isomerization]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 08:32:29 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 07:20:52 2008''

Revision as of 04:20, 28 July 2008

Image:2j96.png

Template:STRUCTURE 2j96

THE E-CONFIGURATION OF ALFA-PHYCOERYTHROCYANIN

Template:ABSTRACT PUBMED 17209552

About this Structure

2J96 is a Single protein structure of sequence from Mastigocladus laminosus. Full crystallographic information is available from OCA.

Reference

Structural basis for the photochemistry of alpha-phycoerythrocyanin., Schmidt M, Patel A, Zhao Y, Reuter W, Biochemistry. 2007 Jan 16;46(2):416-23. PMID:17209552

Page seeded by OCA on Mon Jul 28 07:20:52 2008

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