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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'''
| | ===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.
| | The line below this paragraph, {{ABSTRACT_PUBMED_15719016}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 15719016 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_15719016}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Transit peptide]] | | [[Category: Transit peptide]] |
| [[Category: Transmembrane]] | | [[Category: Transmembrane]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 20:18:44 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 16:17:57 2008'' |
