title: Superoxide mediated chlorophyll allomerization in a dimethyl sulphoxide-water mixture.
abstract: The interaction of chlorophyll a with superoxide anion was studied in an alkaline DMSO-water system. It was found that O2(-.), directly or via HO2., produces the chlorophyll enolate-ion (Molish's intermediate) that is oxidized to Mg-chlorine(s). The allomerization reaction was found to be inhibited by superoxide dismutase. A possible participation of oxygen radicals in chlorophyll degradation in plants is discussed.
authors.affiliation: Department of Cell Physiology & Immunology, Faculty of Biology, Moscow State University, USSR.
authors.forename: M N
authors.initials: MN
authors.lastname: Merzlyak
authors.forename: V A
authors.initials: VA
authors.lastname: Kovrizhnikh
authors.forename: K N
authors.initials: KN
authors.lastname: Timofeev
mesh_terms: D002734:Chlorophyll / Q000737:chemistry*; D000077194:Chlorophyll A; D004121:Dimethyl Sulfoxide; D004578:Electron Spin Resonance Spectroscopy; D007887:Fabaceae; D007536:Isomerism; D007700:Kinetics; D010860:Pigments, Biological / Q000737:chemistry; D010946:Plants, Medicinal; D013053:Spectrophotometry; D013481:Superoxides; D014867:Water
chemical_list: D010860:Pigments, Biological; D014867:Water; D013481:Superoxides; D002734:Chlorophyll; D000077194:Chlorophyll A; D004121:Dimethyl Sulfoxide