4b3w

Crystal structure of human cytoglobin H(E7)Q mutant

spinqualitylabelsall models 4b3w, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4b3w is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.8Å Ligands: ACT, CYN, FC6, HEM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CYGB_HUMAN May have a protective function during conditions of oxidative stress. May be involved in intracellular oxygen storage or transfer. Publication Abstract from PubMed Cytoglobin (Cygb) was recently discovered in the human genome and localized in different tissues. It was suggested to play tissue-specific protective roles, spanning from scavenging of reactive oxygen species in neurons to supplying oxygen to enzymes in fibroblasts. To shed light on the functioning of such versatile machinery, we have studied the processes supporting transport of gaseous heme ligands in Cygb. Carbon monoxide rebinding shows a complex kinetic pattern with several distinct reaction intermediates, reflecting rebinding from temporary docking sites, second order recombination, and formation (and dissociation) of a bis-histidyl heme hexacoordinated reaction intermediate. Ligand exit to the solvent occurs through distinct pathways, some of which exploit temporary docking sites. The remarkable change in energetic barriers, linked to heme bis-histidyl hexacoordination by HisE7, may be responsible for active regulation of the flux of reactants and products to and from the reaction site on the distal side of the heme. A substantial change in both protein dynamics and inner cavities is observed upon transition from the CO-liganded to the pentacoordinated and bis-histidyl hexacoordinated species, which could be exploited as a signalling state. These findings are consistent with the expected versatility of the molecular activity of this protein. CO Rebinding Kinetics and Molecular Dynamics Simulations Highlight Dynamic Regulation of Internal Cavities in Human Cytoglobin.,Gabba M, Abbruzzetti S, Spyrakis F, Forti F, Bruno S, Mozzarelli A, Luque FJ, Viappiani C, Cozzini P, Nardini M, Germani F, Bolognesi M, Moens L, Dewilde S PLoS One. 2013;8(1):e49770. doi: 10.1371/journal.pone.0049770. Epub 2013 Jan 4. PMID:23308092 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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