1aig

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{{STRUCTURE_1aig| PDB=1aig | SCENE= }}
{{STRUCTURE_1aig| PDB=1aig | SCENE= }}
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'''PHOTOSYNTHETIC REACTION CENTER FROM RHODOBACTER SPHAEROIDES IN THE D+QB-CHARGE SEPARATED STATE'''
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===PHOTOSYNTHETIC REACTION CENTER FROM RHODOBACTER SPHAEROIDES IN THE D+QB-CHARGE SEPARATED STATE===
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==Overview==
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High resolution x-ray diffraction data from crystals of the Rhodobacter sphaeroides photosynthetic reaction center (RC) have been collected at cryogenic temperature in the dark and under illumination, and the structures were refined at 2.2 and 2.6 angstrom resolution, respectively. In the charge-separated D+QAQB- state (where D is the primary electron donor (a bacteriochlorophyll dimer), and QA and QB are the primary and secondary quinone acceptors, respectively), QB- is located approximately 5 angstroms from the QB position in the charge-neutral (DQAQB) state, and has undergone a 180 degrees propeller twist around the isoprene chain. A model based on the difference between the two structures is proposed to explain the observed kinetics of electron transfer from QA-QB to QAQB- and the relative binding affinities of the different ubiquinone species in the QB pocket. In addition, several water channels (putative proton pathways) leading from the QB pocket to the surface of the RC were delineated, one of which leads directly to the membrane surface.
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(as it appears on PubMed at http://www.pubmed.gov), where 9115209 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9115209}}
==About this Structure==
==About this Structure==
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[[Category: Integral membrane protein]]
[[Category: Integral membrane protein]]
[[Category: Photosynthetic reaction center]]
[[Category: Photosynthetic reaction center]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:18:33 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 16:54:59 2008''

Revision as of 13:55, 30 June 2008

Image:1aig.png

Template:STRUCTURE 1aig

PHOTOSYNTHETIC REACTION CENTER FROM RHODOBACTER SPHAEROIDES IN THE D+QB-CHARGE SEPARATED STATE

Template:ABSTRACT PUBMED 9115209

About this Structure

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

Reference

Light-induced structural changes in photosynthetic reaction center: implications for mechanism of electron-proton transfer., Stowell MH, McPhillips TM, Rees DC, Soltis SM, Abresch E, Feher G, Science. 1997 May 2;276(5313):812-6. PMID:9115209

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