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2axt

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{{STRUCTURE_2axt| PDB=2axt | SCENE= }}
{{STRUCTURE_2axt| PDB=2axt | SCENE= }}
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'''Crystal Structure of Photosystem II from Thermosynechococcus elongatus'''
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===Crystal Structure of Photosystem II from Thermosynechococcus elongatus===
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==Overview==
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Oxygenic photosynthesis in plants, algae and cyanobacteria is initiated at photosystem II, a homodimeric multisubunit protein-cofactor complex embedded in the thylakoid membrane. Photosystem II captures sunlight and powers the unique photo-induced oxidation of water to atmospheric oxygen. Crystallographic investigations of cyanobacterial photosystem II have provided several medium-resolution structures (3.8 to 3.2 A) that explain the general arrangement of the protein matrix and cofactors, but do not give a full picture of the complex. Here we describe the most complete cyanobacterial photosystem II structure obtained so far, showing locations of and interactions between 20 protein subunits and 77 cofactors per monomer. Assignment of 11 beta-carotenes yields insights into electron and energy transfer and photo-protection mechanisms in the reaction centre and antenna subunits. The high number of 14 integrally bound lipids reflects the structural and functional importance of these molecules for flexibility within and assembly of photosystem II. A lipophilic pathway is proposed for the diffusion of secondary plastoquinone that transfers redox equivalents from photosystem II to the photosynthetic chain. The structure provides information about the Mn4Ca cluster, where oxidation of water takes place. Our study uncovers near-atomic details necessary to understand the processes that convert light to chemical energy.
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(as it appears on PubMed at http://www.pubmed.gov), where 16355230 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16355230}}
==About this Structure==
==About this Structure==
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[[Category: Ps2]]
[[Category: Ps2]]
[[Category: Transmembrane alpha-helix]]
[[Category: Transmembrane alpha-helix]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Apr 30 13:51:21 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 15:39:49 2008''

Revision as of 12:39, 29 July 2008

Image:2axt.png

Template:STRUCTURE 2axt

Crystal Structure of Photosystem II from Thermosynechococcus elongatus

Template:ABSTRACT PUBMED 16355230

About this Structure

2AXT is a Protein complex structure of sequences from Thermosynechococcus elongatus. Full crystallographic information is available from OCA.

Reference

Towards complete cofactor arrangement in the 3.0 A resolution structure of photosystem II., Loll B, Kern J, Saenger W, Zouni A, Biesiadka J, Nature. 2005 Dec 15;438(7070):1040-4. PMID:16355230

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