2o01
From Proteopedia
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The Structure of a plant photosystem I supercomplex at 3.4 Angstrom resolution
Overview
All higher organisms on Earth receive energy directly or indirectly from, oxygenic photosynthesis performed by plants, green algae and, cyanobacteria. Photosystem I (PSI) is a supercomplex of a reaction centre, and light-harvesting complexes. It generates the most negative redox, potential in nature, and thus largely determines the global amount of, enthalpy in living systems. We report the structure of plant PSI at 3.4 A, resolution, revealing 17 protein subunits. PsaN was identified in the, luminal side of the supercomplex, and most of the amino acids in the, reaction centre were traced. The crystal structure of PSI provides a, picture at near atomic detail of 11 out of 12 protein subunits of the, reaction centre. At this level, 168 chlorophylls (65 assigned with, orientations for Q(x) and Q(y) transition dipole moments), 2, phylloquinones, 3 Fe(4)S(4) clusters and 5 carotenoids are described. This, structural information extends the understanding of the most efficient, nano-photochemical machine in nature.
About this Structure
2O01 is a Protein complex structure of sequences from Arabidopsis thaliana, Phaseolus vulgaris, Pisum sativum and Spinacia oleracea with , , and as ligands. Full crystallographic information is available from OCA.
Reference
The structure of a plant photosystem I supercomplex at 3.4 A resolution., Amunts A, Drory O, Nelson N, Nature. 2007 May 3;447(7140):58-63. PMID:17476261
Page seeded by OCA on Wed Jan 23 12:02:38 2008
