1qzv
From Proteopedia
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Crystal structure of plant photosystem I
Overview
Oxygenic photosynthesis is the principal producer of both oxygen and, organic matter on Earth. The conversion of sunlight into chemical energy, is driven by two multisubunit membrane protein complexes named photosystem, I and II. We determined the crystal structure of the complete photosystem, I (PSI) from a higher plant (Pisum sativum var. alaska) to 4.4 A, resolution. Its intricate structure shows 12 core subunits, 4 different, light-harvesting membrane proteins (LHCI) assembled in a half-moon shape, on one side of the core, 45 transmembrane helices, 167 chlorophylls, 3, Fe-S clusters and 2 phylloquinones. About 20 chlorophylls are positioned, in strategic locations in the cleft between LHCI and the core. This, structure provides a framework for exploration not only of energy and, electron transfer but also of the evolutionary forces that shaped the, photosynthetic apparatus of terrestrial plants after the divergence of, chloroplasts from marine cyanobacteria one billion years ago.
About this Structure
1QZV is a Protein complex structure of sequences from Pisum sativum with CL1, PQN and SF4 as ligands. Full crystallographic information is available from OCA.
Reference
Crystal structure of plant photosystem I., Ben-Shem A, Frolow F, Nelson N, Nature. 2003 Dec 11;426(6967):630-5. PMID:14668855
Page seeded by OCA on Sat Nov 24 21:52:15 2007
