title: Is the biotransformation of chlorinated dibenzo-p-dioxins by Sphingomonas wittichii RW1 governed by thermodynamic factors?
abstract: Density functional theory (DFT) calculations were used to explore the relationship between the biotransformation of dibenzo-p-dioxin and selected chlorinated derivatives by resting cells of Sphingomonas wittichii RW1 and measuring the thermodynamic properties of the biotransformation substrates. Sphingomonas wittichii RW1 can aerobically catabolize dibenzo-p-dioxin as well as 2,7-dichloro-, 1,2,3-trichloro-, 1,2,3,4-tetrachloro-, and 1,2,3,4,7,8-hexachlorodibenzo-p-dioxin; however, neither the 2,3,7-trichloro- nor the 1,2,3,7,8-pentachlorodibenzo-p-dioxin was transformed to its corresponding metabolic intermediate. The experimental biotransformation rates established were apparently governed by the selected thermodynamic properties of the substrates tested.
authors.affiliation: Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 305-350, Republic of Korea, nih@kigam.re.kr.
authors.forename: In-Hyun
authors.initials: IH
authors.lastname: Nam
authors.forename: Hyo-Bong
authors.initials: HB
authors.lastname: Hong
authors.forename: Stefan
authors.initials: S
authors.lastname: Schmidt
mesh_terms: D001711:Biotransformation; D004147:Dioxins / Q000378:metabolism*; D020578:Sphingomonas / Q000378:metabolism*; D013816:Thermodynamics
chemical_list: D004147:Dioxins; C020887:dibenzo(1,4)dioxin