title: Doming modes and dynamics of model heme compounds.
abstract: Synchrotron far-IR spectroscopy and density-functional calculations are used to characterize the low-frequency dynamics of model heme FeCO compounds. The "doming" vibrational mode in which the iron atom moves out of the porphyrin plane while the periphery of this ring moves in the opposite direction determines the reactivity of oxygen with this type of molecule in biological systems. Calculations of frequencies and absorption intensities and the measured pressure dependence of vibrational modes in the model compounds are used to identify the doming and related normal modes.
authors.affiliation: Institute for Molecular Sciences, National Research Council of Canada, Ottawa, ON, Canada K1A 0R6.
authors.forename: Dennis D
authors.initials: DD
authors.lastname: Klug
authors.forename: Marek Z
authors.initials: MZ
authors.lastname: Zgierski
authors.forename: John S
authors.initials: JS
authors.lastname: Tse
authors.forename: Zhenxian
authors.initials: Z
authors.lastname: Liu
authors.forename: James R
authors.initials: JR
authors.lastname: Kincaid
authors.forename: Kazimierz
authors.initials: K
authors.lastname: Czarnecki
authors.forename: Russell J
authors.initials: RJ
authors.lastname: Hemley
mesh_terms: D000818:Animals; D055592:Biophysical Phenomena; D001703:Biophysics; D006418:Heme / Q000737:chemistry*; D007501:Iron / Q000378:metabolism; D008954:Models, Biological; D008958:Models, Molecular; D009211:Myoglobin / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D011166:Porphyrins / Q000737:chemistry*; D011312:Pressure; D013055:Spectrophotometry, Infrared; D013696:Temperature
chemical_list: D009211:Myoglobin; D011166:Porphyrins; D006418:Heme; D007501:Iron; D010100:Oxygen