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2bhw

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[[Image:2bhw.gif|left|200px]]
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{{STRUCTURE_2bhw| PDB=2bhw | SCENE= }}
{{STRUCTURE_2bhw| PDB=2bhw | SCENE= }}
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'''PEA LIGHT-HARVESTING COMPLEX II AT 2.5 ANGSTROM RESOLUTION'''
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===PEA LIGHT-HARVESTING COMPLEX II AT 2.5 ANGSTROM RESOLUTION===
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==Overview==
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The plant light-harvesting complex of photosystem II (LHC-II) collects and transmits solar energy for photosynthesis in chloroplast membranes and has essential roles in regulation of photosynthesis and in photoprotection. The 2.5 A structure of pea LHC-II determined by X-ray crystallography of stacked two-dimensional crystals shows how membranes interact to form chloroplast grana, and reveals the mutual arrangement of 42 chlorophylls a and b, 12 carotenoids and six lipids in the LHC-II trimer. Spectral assignment of individual chlorophylls indicates the flow of energy in the complex and the mechanism of photoprotection in two close chlorophyll a-lutein pairs. We propose a simple mechanism for the xanthophyll-related, slow component of nonphotochemical quenching in LHC-II, by which excess energy is transferred to a zeaxanthin replacing violaxanthin in its binding site, and dissipated as heat. Our structure shows the complex in a quenched state, which may be relevant for the rapid, pH-induced component of nonphotochemical quenching.
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{{ABSTRACT_PUBMED_15719016}}
==About this Structure==
==About this Structure==
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[[Category: Transit peptide]]
[[Category: Transit peptide]]
[[Category: Transmembrane]]
[[Category: Transmembrane]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 20:18:44 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 16:17:57 2008''

Revision as of 13:17, 29 July 2008

Image:2bhw.png

Template:STRUCTURE 2bhw

PEA LIGHT-HARVESTING COMPLEX II AT 2.5 ANGSTROM RESOLUTION

Template:ABSTRACT PUBMED 15719016

About this Structure

2BHW is a Single protein structure of sequence from Pisum sativum. Full crystallographic information is available from OCA.

Reference

Mechanisms of photoprotection and nonphotochemical quenching in pea light-harvesting complex at 2.5 A resolution., Standfuss J, Terwisscha van Scheltinga AC, Lamborghini M, Kuhlbrandt W, EMBO J. 2005 Mar 9;24(5):919-28. Epub 2005 Feb 17. PMID:15719016

Page seeded by OCA on Tue Jul 29 16:17:57 2008

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