1izl

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{{STRUCTURE_1izl| PDB=1izl | SCENE= }}
{{STRUCTURE_1izl| PDB=1izl | SCENE= }}
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'''Crystal Structure of Photosystem II'''
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===Crystal Structure of Photosystem II===
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==Overview==
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Photosystem II (PSII) is a multisubunit membrane protein complex performing light-induced electron transfer and water-splitting reactions, leading to the formation of molecular oxygen. The first crystal structure of PSII from a thermophilic cyanobacterium Thermosynechococcus elongatus was reported recently [Zouni, A., Witt, H. T., Kern, J., Fromme, P., Krauss, N., Saenger, W. &amp; Orth, P. (2001) Nature 409, 739-743)] at 3.8-A resolution. To analyze the PSII structure in more detail, we have obtained the crystal structure of PSII from another thermophilic cyanobacterium, Thermosynechococcus vulcanus, at 3.7-A resolution. The present structure was built on the basis of the sequences of PSII large subunits D1, D2, CP47, and CP43; extrinsic 33- and 12-kDa proteins and cytochrome c550; and several low molecular mass subunits, among which the structure of the 12-kDa protein was not reported previously. This yielded much information concerning the molecular interactions within this large protein complex. We also show the arrangement of chlorophylls and cofactors, including two beta-carotenes recently identified in a region close to the reaction center, which provided important clues to the secondary electron transfer pathways around the reaction center. Furthermore, possible ligands for the Mn-cluster were determined. In particular, the C terminus of D1 polypeptide was shown to be connected to the Mn cluster directly. The structural information obtained here provides important insights into the mechanism of PSII reactions.
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(as it appears on PubMed at http://www.pubmed.gov), where 12518057 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12518057}}
==About this Structure==
==About this Structure==
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[[Category: Photosynthetic reaction center]]
[[Category: Photosynthetic reaction center]]
[[Category: Thermophilic cyanobacterium]]
[[Category: Thermophilic cyanobacterium]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 14:16:27 2008''

Revision as of 11:16, 1 July 2008

Image:1izl.png

Template:STRUCTURE 1izl

Crystal Structure of Photosystem II

Template:ABSTRACT PUBMED 12518057

About this Structure

1IZL is a Protein complex structure of sequences from Bacteria and Thermosynechococcus vulcanus. Full crystallographic information is available from OCA.

Reference

Crystal structure of oxygen-evolving photosystem II from Thermosynechococcus vulcanus at 3.7-A resolution., Kamiya N, Shen JR, Proc Natl Acad Sci U S A. 2003 Jan 7;100(1):98-103. Epub 2002 Dec 23. PMID:12518057

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