2j96
From Proteopedia
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|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2j96 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2j96 OCA], [http://www.ebi.ac.uk/pdbsum/2j96 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2j96 RCSB]</span> | ||
}} | }} | ||
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[[Category: Schmidt, M.]] | [[Category: Schmidt, M.]] | ||
[[Category: Zhao, Y.]] | [[Category: Zhao, Y.]] | ||
| - | [[Category: PVN]] | ||
[[Category: bile pigment]] | [[Category: bile pigment]] | ||
[[Category: chromophore]] | [[Category: chromophore]] | ||
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[[Category: z- to e-isomerization]] | [[Category: z- to e-isomerization]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 03:54:49 2008'' |
Revision as of 00:54, 31 March 2008
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| , resolution 2.25Å | |||||||
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
THE E-CONFIGURATION OF ALFA-PHYCOERYTHROCYANIN
Overview
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.
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
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