1izl
From Proteopedia
(New page: 200px<br /><applet load="1izl" size="450" color="white" frame="true" align="right" spinBox="true" caption="1izl, resolution 3.70Å" /> '''Crystal Structure of...) |
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| - | [[Image:1izl.gif|left|200px]]<br /><applet load="1izl" size=" | + | [[Image:1izl.gif|left|200px]]<br /><applet load="1izl" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1izl, resolution 3.70Å" /> | caption="1izl, resolution 3.70Å" /> | ||
'''Crystal Structure of Photosystem II'''<br /> | '''Crystal Structure of Photosystem II'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Photosystem II (PSII) is a multisubunit membrane protein complex | + | 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. & 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. |
==About this Structure== | ==About this Structure== | ||
| - | 1IZL is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bacteria Bacteria] and [http://en.wikipedia.org/wiki/Thermosynechococcus_vulcanus Thermosynechococcus vulcanus] with MN, FE, CLA, PHO, HEM, PLA and BCR as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | + | 1IZL is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bacteria Bacteria] and [http://en.wikipedia.org/wiki/Thermosynechococcus_vulcanus Thermosynechococcus vulcanus] with <scene name='pdbligand=MN:'>MN</scene>, <scene name='pdbligand=FE:'>FE</scene>, <scene name='pdbligand=CLA:'>CLA</scene>, <scene name='pdbligand=PHO:'>PHO</scene>, <scene name='pdbligand=HEM:'>HEM</scene>, <scene name='pdbligand=PLA:'>PLA</scene> and <scene name='pdbligand=BCR:'>BCR</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IZL OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Thermosynechococcus vulcanus]] | [[Category: Thermosynechococcus vulcanus]] | ||
[[Category: Kamiya, N.]] | [[Category: Kamiya, N.]] | ||
| - | [[Category: Shen, J | + | [[Category: Shen, J R.]] |
[[Category: BCR]] | [[Category: BCR]] | ||
[[Category: CLA]] | [[Category: CLA]] | ||
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[[Category: thermophilic cyanobacterium]] | [[Category: thermophilic cyanobacterium]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:17:27 2008'' |
Revision as of 11:17, 21 February 2008
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Crystal Structure of Photosystem II
Overview
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. & 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.
About this Structure
1IZL is a Protein complex structure of sequences from Bacteria and Thermosynechococcus vulcanus with , , , , , and as ligands. 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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