Biomaterial Database

Mitochondrial production of hydrogen peroxide in Saccharomyces cerevisiae. 1976

A Boveris

Intact mitochondria isolated from bakers' yeast and showing respiratory control by ADP, released H2O2 to the suspending medium at rates of 1.2.2.2 nmol/min per mg of protein depending on the mitochondrial metabolic condition. Release of H2O2 from mitochondria increased 1.3 times in swollen mitochondria and 1.2 times after osmotic shock, i.e., when the outer membrane was damaged. Under physiological conditions, yeast cytochrome c peroxidase, mainly located in the intermembrane space, utilized about 53-55% of the H2O2 generated by the respiratory chain at the inner membrane, partially preventing H2O2 diffusion to the cytosol. Apparently, the outer mitochondrial membrane was highly permeable to H2O2. It is claimed that the risk of cell injury due to H2O2, O-2 and HO is slightly higher in the stationary phase than in the logarithmic phase of growth.

UI	MeSH Term	Description	Entries
D008928	Mitochondria	Semiautonomous, self-reproducing organelles that occur in the cytoplasm of all cells of most, but not all, eukaryotes. Each mitochondrion is surrounded by a double limiting membrane. The inner membrane is highly invaginated, and its projections are called cristae. Mitochondria are the sites of the reactions of oxidative phosphorylation, which result in the formation of ATP. They contain distinctive RIBOSOMES, transfer RNAs (RNA, TRANSFER); AMINO ACYL T RNA SYNTHETASES; and elongation and termination factors. Mitochondria depend upon genes within the nucleus of the cells in which they reside for many essential messenger RNAs (RNA, MESSENGER). Mitochondria are believed to have arisen from aerobic bacteria that established a symbiotic relationship with primitive protoeukaryotes. (King & Stansfield, A Dictionary of Genetics, 4th ed)	Mitochondrial Contraction,Mitochondrion,Contraction, Mitochondrial,Contractions, Mitochondrial,Mitochondrial Contractions
D010101	Oxygen Consumption	The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)	Consumption, Oxygen,Consumptions, Oxygen,Oxygen Consumptions
D003578	Cytochrome-c Peroxidase	A hemeprotein which catalyzes the oxidation of ferrocytochrome c to ferricytochrome c in the presence of hydrogen peroxide. EC 1.11.1.5.	Cytochrome Peroxidase,Cytochrome c-551 Peroxidase,Cytochrome c 551 Peroxidase,Cytochrome c Peroxidase,Peroxidase, Cytochrome,Peroxidase, Cytochrome c-551,Peroxidase, Cytochrome-c
D006861	Hydrogen Peroxide	A strong oxidizing agent used in aqueous solution as a ripening agent, bleach, and topical anti-infective. It is relatively unstable and solutions deteriorate over time unless stabilized by the addition of acetanilide or similar organic materials.	Hydrogen Peroxide (H2O2),Hydroperoxide,Oxydol,Perhydrol,Superoxol,Peroxide, Hydrogen
D000968	Antimycin A	An antibiotic substance produced by Streptomyces species. It inhibits mitochondrial respiration and may deplete cellular levels of ATP. Antimycin A1 has been used as a fungicide, insecticide, and miticide. (From Merck Index, 12th ed)	Butanoic acid, 2(or 3)-methyl-, 3-((3-(formylamino)-2-hydroxybenzoyl)amino)-8-hexyl-2,6-dimethyl-4,9-dioxo-1,5-dioxonan-7-yl ester,Antimycin A1
D012441	Saccharomyces cerevisiae	A species of the genus SACCHAROMYCES, family Saccharomycetaceae, order Saccharomycetales, known as "baker's" or "brewer's" yeast. The dried form is used as a dietary supplement.	Baker's Yeast,Brewer's Yeast,Candida robusta,S. cerevisiae,Saccharomyces capensis,Saccharomyces italicus,Saccharomyces oviformis,Saccharomyces uvarum var. melibiosus,Yeast, Baker's,Yeast, Brewer's,Baker Yeast,S cerevisiae,Baker's Yeasts,Yeast, Baker