1s6a

The X-ray structure of the cyanobacteria Synechocystis hemoglobin "cyanoglobin" with azide ligand

spinqualitylabelsall models 1s6a, resolution 1.69Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1s6a is a 1 chain structure with sequence from Aphanocapsa sp. (strain n-1). Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AZI, FLC, HEM Related: 1s69 Gene: GLBN, SLR2097 (Aphanocapsa sp. (strain N-1)) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [TRHBN_SYNY3] Forms a very stable complex with oxygen. The oxygen dissociation rate is 0.011 s(-1). 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 The crystal structures of cyanide and azide-bound forms of the truncated hemoglobin from Synechocystis are presented at 1.8 angstroms resolution. A comparison with the structure of the endogenously liganded protein reveals a conformational shift unprecedented in hemoglobins, and provides the first picture of a hexacoordinate hemoglobin in both the bis-histidyl and the exogenously coordinated states. The structural changes between the different conformations are confined to two regions of the protein; the B helix, and the E helix, including the EF loop. A molecular "hinge" controlling movement of the E helix is observed in the EF loop, which is composed of three principal structural elements: Arg64, the heme-d-propionate, and a three-residue extension of the F helix. Additional features of the structural transition between the two protein conformations are discussed as they relate to the complex ligand-binding behavior observed in hexacoordinate hemoglobins, and the potential physiological function of this class of proteins. Crystallographic analysis of synechocystis cyanoglobin reveals the structural changes accompanying ligand binding in a hexacoordinate hemoglobin.,Trent JT 3rd, Kundu S, Hoy JA, Hargrove MS J Mol Biol. 2004 Aug 20;341(4):1097-108. PMID:15289104 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Hemoglobin 3D structures

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