1c6s

THE SOLUTION STRUCTURE OF CYTOCHROME C6 FROM THE THERMOPHILIC CYANOBACTERIUM SYNECHOCOCCUS ELONGATUS, NMR, 20 STRUCTURES

spinqualitylabelsall models 1c6s Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1c6s is a 1 chain structure with sequence from Synechococcus elongatus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, models Ligands: HEC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CYC6_SYNEL Functions as an electron carrier between membrane-bound cytochrome b6-f and photosystem I in oxygenic photosynthesis. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Cytochrome c6 is a small, soluble electron carrier between the two membrane-bound complexes cytochrome b6f and photosystem I (PSI) in oxygenic photosynthesis. We determined the solution structure of cytochrome c6 from the thermophilic cyanobacterium Synechococcus elongatus by NMR spectroscopy and molecular dynamics calculations based on 1586 interresidual distance and 28 dihedral angle restraints. The overall fold exhibits four alpha-helices and a small antiparallel beta-sheet in the vicinity of Met58, one of the axial heme ligands. The flat hydrophobic area in this cytochrome c6 is conserved in other c6 cytochromes and even in plastocyanin of higher plants. This docking region includes the site of electron transfer to PSI and possibly to the cytochrome b6f complex. The binding of cytochrome c6 to PSI in green algae involves interaction of a negative patch with a positive domain of PSI. This positive domain has not been inserted at the evolutionary level of cyanobacteria, but the negatively charged surface region is already present in S. elongatus cytochrome c6 and may thus have been optimized during evolution to improve the interaction with the positively charged cytochrome f. As the structure of PSI is known in S.elongatus, the reported cytochrome c6 structure can provide a basis for mutagenesis studies to delineate the mechanism of electron transfer between both. Solution structure of cytochrome c6 from the thermophilic cyanobacterium Synechococcus elongatus.,Beissinger M, Sticht H, Sutter M, Ejchart A, Haehnel W, Rosch P EMBO J. 1998 Jan 2;17(1):27-36. PMID:9427738 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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