title: Characterization by NMR of the heme-myoglobin adduct formed during the reductive metabolism of BrCCl3. Covalent bonding of the proximal histidine to the ring I vinyl group.
abstract: The reductive debromination of BrCCl3 by ferrous deoxymyoglobin leads to the covalent bonding of the prosthetic heme to the protein. We have previously shown, by the use of peptide mapping and mass spectrometry, that histidine residue 93 is covalently bound to the heme moiety. In the present study the structure of the heme adduct was more completely determined by 1H and 13C NMR techniques. We have found that the ring I vinyl group of the prosthetic heme was altered by the addition of a histidine imidazole nitrogen to the alpha-carbon and a CCl2 moiety to the beta-carbon. The electronic absorption spectra of the oxidized and reduced states of the altered heme-protein indicated that the heme-iron exists in a bis-histidine-ligated form. Analysis of the crystal structure of native myoglobin suggested that for the altered heme-protein, histidine residues 97 and 64 are ligated to the heme-iron and that residue 97 has replaced the native proximal histidine residue 93. These movements, in effect a "histidine shuffle" at the active site, may be responsible for the enhanced reducing activity of the altered protein.
authors.affiliation: Laboratory of Chemical Pharmacology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892.
authors.forename: Y
authors.initials: Y
authors.lastname: Osawa
authors.forename: R J
authors.initials: RJ
authors.lastname: Highet
authors.forename: A
authors.initials: A
authors.lastname: Bax
authors.forename: L R
authors.initials: LR
authors.lastname: Pohl
mesh_terms: D006418:Heme / Q000378:metabolism*; D006639:Histidine / Q000737:chemistry*; D006842:Hydrocarbons, Brominated / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009211:Myoglobin / Q000378:metabolism*; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet; D022882:Trihalomethanes
chemical_list: D006842:Hydrocarbons, Brominated; D009211:Myoglobin; D022882:Trihalomethanes; D006418:Heme; D006639:Histidine; C015044:bromoform