title: [Photodynamic damage of yeast subcellular fraction induced by elevated levels of endogenous protoporphyrin IX].
abstract: The 2,2'-dipyridyl-induced accumulation of protoporphyrin IX in Saccharomyces cerevisiae cells was shown to be accompanied by the photoinhibition of cell respiration and the enhancement of the photoinduced permeability of plasma membranes to the fluorescent dye primuline. The visible-light illumination (at 400-600 nm) of the mitochondria and plasma membranes isolated from yeast cells with a high level of endogenous protoporphyrin IX intensified lipid peroxidation in these subcellular organelles. Comparative studies showed that the rad 52 mutant cells, which are deficient in the postreplicative recombinational DNA repair system, are considerably more sensitive to the inactivating action of visible light than are the wild-type cells and the rad 3 mutant cells, which are deficient in the excision DNA repair system. The contribution of photodynamic damage to the yeast subcellular organelles to the lethal photodynamic effect is discussed.
authors.affiliation: Moscow State University, Vorob'evy gory, Moscow, 119899 Russia.
authors.forename: A O
authors.initials: AO
authors.lastname: Shumarina
authors.forename: M G
authors.initials: MG
authors.lastname: Strakhovskaia
authors.forename: V B
authors.initials: VB
authors.lastname: Turovetskiĭ
authors.forename: G Ia
authors.initials: GIa
authors.lastname: Fraĭkin
mesh_terms: D015082:2,2'-Dipyridyl; D002462:Cell Membrane / Q000378:metabolism / Q000528:radiation effects; D002463:Cell Membrane Permeability / Q000528:radiation effects; D004260:DNA Repair; D004307:Dose-Response Relationship, Radiation; D005456:Fluorescent Dyes; D008027:Light; D015227:Lipid Peroxidation; D008928:Mitochondria / Q000378:metabolism / Q000528:radiation effects; D009154:Mutation; D011524:Protoporphyrins / Q000032:analysis / Q000096:biosynthesis / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000235:genetics / Q000378:metabolism*; D013347:Subcellular Fractions / Q000378:metabolism / Q000528:radiation effects*; D013844:Thiazoles
chemical_list: D005456:Fluorescent Dyes; D011524:Protoporphyrins; D013844:Thiazoles; D015082:2,2'-Dipyridyl; C035646:primuline; C028025:protoporphyrin IX