2bhw

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Image:2bhw.gif

2bhw, resolution 2.5Å

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PEA LIGHT-HARVESTING COMPLEX II AT 2.5 ANGSTROM RESOLUTION

Overview

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.

About this Structure

2BHW is a Single protein structure of sequence from Pisum sativum with LUX, NEX, XAT, CLA, CHL, LHG and DGD as ligands. Known structural/functional Site: . 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

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