1emy

CRYSTAL STRUCTURE OF ASIAN ELEPHANT (ELEPHAS MAXIMUS) CYANO-MET MYOGLOBIN AT 1.78 ANGSTROMS RESOLUTION. PHE 29 (B10) ACCOUNTS FOR ITS UNUSUAL LIGAND BINDING PROPERTIES

spinqualitylabelsall models 1emy, resolution 1.78Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1emy is a 1 chain structure with sequence from Elephas maximus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CYN, HEM Resources: FirstGlance, OCA, RCSB, PDBsum 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 structure of Asian elephant cyano-metmyoglobin which has a glutamine instead of the usual distal site histidine has been determined to high resolution. In addition to this replacement, the substitution of a conserved leucine residue in position 29(B10) at the distal side by a phenylalanine was unambiguously identified based on the available electron density. The suspicion, that there were errors in the original sequence which has caused some confusion, is thus confirmed. Comparison with other myoglobin structures in various ligated forms reveals an essentially unchanged tertiary structure in elephant myoglobin despite the two amino acid substitutions in the heme pocket. Our current structural model shows that the N epsilon 2 atom of Gln64(E7) has moved with respect to the corresponding nitrogen position of His64(E7) in the CO complex of sperm whale myoglobin. The newly assigned residue Phe29(B10) penetrates into the distal side of the heme pocket approaching the ligand within van der Waals distance and causing a much more crowded heme pocket compared to other myoglobins. Kinetic properties of Asian elephant myoglobin, wild type, and recombinant sperm whale myoglobins are discussed in relation to the structural consequences of the two amino acid substitutions H64Q and L29F. Crystal structure of Asian elephant (Elephas maximus) cyano-metmyoglobin at 1.78-A resolution. Phe29(B10) accounts for its unusual ligand binding properties.,Bisig DA, Di Iorio EE, Diederichs K, Winterhalter KH, Piontek K J Biol Chem. 1995 Sep 1;270(35):20754-62. PMID:7657658 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Myoglobin

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