4kmg | pdb_00004kmg

Crystal structure of cytochrome c6B from Synechococcus sp. WH8102

spinqualitylabelsall models 4kmg, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4kmg is a 1 chain structure with sequence from Parasynechococcus marenigrum WH 8102. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: HEC, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q7U624_PARMW Functions as an electron carrier between membrane-bound cytochrome b6-f and photosystem I in oxygenic photosynthesis.[ARBA:ARBA00002347] Publication Abstract from PubMed Cytochromes c are soluble electron carriers of relatively low molecular weight, containing single heme moiety. In cyanobacteria cytochrome c6 participates in electron transfer from cytochrome b6f complex to photosystem I. Recent phylogenetic analysis revealed the existence of a few families of proteins homologous to the previously mentioned. Cytochrome c6A from Arabidopsis thaliana was identified as a protein responsible for disulfide bond formation in response to intracellular redox state changes and c550 is well known element of photosystem II. However, function of cytochromes marked as c6B, c6C and cM as well as the physiological process in which they take a part still remain unidentified. Here we present the first structural and biophysical analysis of cytochrome from the c6B family from mesophilic cyanobacteria Synechococcus sp. WH 8102. Purified protein was crystallized and its structure was refined at 1.4A resolution. Overall architecture of this polypeptide resembles typical I-class cytochromes c. The main features, that distinguish described protein from cytochrome c6, are slightly red-shifted alpha band of UV-Vis spectrum as well as relatively low midpoint potential (113.2+/-2.2mV). Although, physiological function of cytochrome c6B has yet to be determined its properties probably exclude the participation of this protein in electron trafficking between b6f complex and photosystem I. Cytochrome c6B of Synechococcus sp. WH 8102 - Crystal structure and basic properties of novel c6-like family representative.,Zatwarnicki P, Barciszewski J, Krzywda S, Jaskolski M, Kolesinski P, Szczepaniak A Biochem Biophys Res Commun. 2014 Jan 24;443(4):1131-5. doi:, 10.1016/j.bbrc.2013.10.167. Epub 2013 Nov 9. PMID:24216109 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome f 3D structures

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