1rg5

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[[Image:1rg5.gif|left|200px]]
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{{Seed}}
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[[Image:1rg5.png|left|200px]]
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{{STRUCTURE_1rg5| PDB=1rg5 | SCENE= }}
{{STRUCTURE_1rg5| PDB=1rg5 | SCENE= }}
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'''Structure of the photosynthetic reaction centre from Rhodobacter sphaeroides carotenoidless strain R-26.1'''
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===Structure of the photosynthetic reaction centre from Rhodobacter sphaeroides carotenoidless strain R-26.1===
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==Overview==
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X-ray diffraction was used to determine high-resolution structures of the reaction center (RC) complex from the carotenoidless mutant, Rb. sphaeroides R-26.1, without or reconstituted with carotenoids. The results are compared with the structure of the RC from a semiaerobically grown Rb. sphaeroides strain 2.4.1. The investigation reveals the structure of the carotenoid in the different protein preparations, the nature of its binding site, and a plausible mechanism by which the carotenoid is incorporated unidirectionally in its characteristic geometric configuration. The structural data suggest that the accessibility of the carotenoid to the binding site is controlled by a specific "gatekeeper" residue which allows the carotenoid to approach the binding site from only one direction. Carotenoid binding to the protein is secured by hydrogen bonding to a separate "locking" amino acid. The study reveals the specific molecular interactions that control how the carotenoid protects the photosynthetic apparatus against photo-induced oxidative destruction.
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(as it appears on PubMed at http://www.pubmed.gov), where 15130469 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15130469}}
==About this Structure==
==About this Structure==
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[[Category: Photosynthesis]]
[[Category: Photosynthesis]]
[[Category: Photosynthetic reaction center]]
[[Category: Photosynthetic reaction center]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 07:27:28 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 05:12:57 2008''

Revision as of 02:13, 29 July 2008

Image:1rg5.png

Template:STRUCTURE 1rg5

Structure of the photosynthetic reaction centre from Rhodobacter sphaeroides carotenoidless strain R-26.1

Template:ABSTRACT PUBMED 15130469

About this Structure

1RG5 is a Protein complex structure of sequences from Rhodobacter sphaeroides. Full crystallographic information is available from OCA.

Reference

Protein regulation of carotenoid binding; gatekeeper and locking amino acid residues in reaction centers of Rhodobacter sphaeroides., Roszak AW, McKendrick K, Gardiner AT, Mitchell IA, Isaacs NW, Cogdell RJ, Hashimoto H, Frank HA, Structure. 2004 May;12(5):765-73. PMID:15130469

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