title: Characterization of the NADH:ubiquinone oxidoreductase (complex I) in the trypanosomatid Phytomonas serpens (Kinetoplastida).
abstract: NADH dehydrogenase activity was characterized in the mitochondrial lysates of Phytomonas serpens, a trypanosomatid flagellate parasitizing plants. Two different high molecular weight NADH dehydrogenases were characterized by native PAGE and detected by direct in-gel activity staining. The association of NADH dehydrogenase activities with two distinct multisubunit complexes was revealed in the second dimension performed under denaturing conditions. One subunit present in both complexes cross-reacted with the antibody against the 39 kDa subunit of bovine complex I. Out of several subunits analyzed by MS, one contained a domain characteristic for the LYR family subunit of the NADH:ubiquinone oxidoreductases. Spectrophotometric measurement of the NADH:ubiquinone 10 and NADH:ferricyanide dehydrogenase activities revealed their different sensitivities to rotenone, piericidin, and diphenyl iodonium.
authors.affiliation: Department of Biochemistry, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia.
authors.forename: Petra
authors.initials: P
authors.lastname: Cermáková
authors.forename: Zdenek
authors.initials: Z
authors.lastname: Verner
authors.forename: Petr
authors.initials: P
authors.lastname: Man
authors.forename: Julius
authors.initials: J
authors.lastname: Lukes
authors.forename: Anton
authors.initials: A
authors.lastname: Horváth
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D015180:Electrophoresis, Gel, Two-Dimensional; D008969:Molecular Sequence Data; D009245:NADH Dehydrogenase / Q000737:chemistry / Q000378:metabolism*; D009247:NADH, NADPH Oxidoreductases / Q000737:chemistry / Q000378:metabolism; D017434:Protein Structure, Tertiary; D021122:Protein Subunits / Q000737:chemistry / Q000378:metabolism; D053719:Tandem Mass Spectrometry; D014351:Trypanosomatina / Q000201:enzymology*
chemical_list: D021122:Protein Subunits; D009247:NADH, NADPH Oxidoreductases; C014227:ferricyanide reductase; D009245:NADH Dehydrogenase