title: Mechanism of 1,4-dehydrogenation catalyzed by a fatty acid (1,4)-desaturase of Calendula officinalis.
abstract: The mechanism by which the fatty acid (1,4)-desaturase of Calendula officinalis produces calendic acid from linoleic acid has been probed through the use of kinetic isotope effect (KIE) measurements. This was accomplished by incubating appropriate mixtures of linoleate and regiospecifically dideuterated isotopomers with a strain of Saccharomyces cerevisiae expressing a functional (1,4)-desaturase. GC-MS analysis of methyl calendate obtained in these experiments showed that the oxidation of linoleate occurs in two discrete steps since the cleavage of the C11-H bond is very sensitive to isotopic substitution (kH/kD = 5.7 +/- 1.0) while no isotope effect (kH/kD = 1.0 +/- 0.1) was observed for the C8-H bond breaking step. These data indicate that calendic acid is produced via initial H-atom abstraction at C11 of a linoleoyl substrate and supports the hypothesis that this transformation represents a regiochemical variation of the more common C12-initiated Delta12 desaturation process.
authors.affiliation: Plant Biotechnology Institute, Saskatoon, SK, Canada; Department of Chemistry, Carleton University, Ottawa, Ontario, Canada.
authors.forename: Darwin W
authors.initials: DW
authors.lastname: Reed
authors.forename: Christopher K
authors.initials: CK
authors.lastname: Savile
authors.forename: Xiao
authors.initials: X
authors.lastname: Qiu
authors.forename: Peter H
authors.initials: PH
authors.lastname: Buist
authors.forename: Patrick S
authors.initials: PS
authors.lastname: Covello
mesh_terms: D001671:Biochemistry / Q000379:methods; D020838:Calendula; D002384:Catalysis; D003903:Deuterium; D044943:Fatty Acid Desaturases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D007553:Isotope Labeling; D019787:Linoleic Acid / Q000737:chemistry / Q000378:metabolism*; D008041:Linoleic Acids / Q000737:chemistry / Q000378:metabolism; D010084:Oxidation-Reduction; D012441:Saccharomyces cerevisiae / Q000235:genetics
chemical_list: D008041:Linoleic Acids; C005575:methyl linoleate; D019787:Linoleic Acid; D003903:Deuterium; D044943:Fatty Acid Desaturases