peroxisome


peroxisome
A membrane-bound organelle occurring in many eukaryotic cells that often has an electron-dense crystalline inclusion containing catalase, urate oxidase, and other oxidative enzymes relating to the formation and degradation of H2O2; thought to be important in detoxifying various molecules and in catalyzing the breakdown of fatty acid s to acetyl-CoA; an absence of peroxisomes is found in individuals with Zellweger syndrome. [peroxide + G. soma, body]

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per·ox·i·some pə-'räk-sə-.sōm n a cytoplasmic cell organelle containing enzymes (as catalase) which act esp. in the production and decomposition of hydrogen peroxide called also microbody
per·ox·i·som·al -.räk-sə-'sō-məl adj

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n.
a small structure within a cell that is similar to a lysosome but contains different enzymes, some of which may take part in reactions involving hydrogen peroxide.

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per·ox·i·some (pər-okґsĭ-sōm) a microbody (q.v.), present in all animal cells except erythrocytes and many plant cells, containing over 50 enzymes that participate in a variety of oxidative processes, including reactions involving hydrogen peroxide, purine metabolism, cellular lipid metabolism, and gluconeogenesis. Similar structures (glyoxysomes), containing the enzymes of the glyoxylate cycle, are found in certain plants and microorganisms. Defects in peroxisome biosynthesis cause adrenoleukodystrophy and cerebrohepatorenal (Zellweger) syndrome.

Medical dictionary. 2011.

Look at other dictionaries:

  • peroxisome — ☆ peroxisome [pər äk′si sōm΄ ] n. 〚/span> PEROXIDE + SOME3〛 any of a group of organelles in some cells of mammals, the leaves of plants, etc., containing enzymes that produce and then decompose hydrogen peroxide: thought to be involved in… …   Universalium

  • peroxisome — peroxisome. См. пероксисома. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • peroxisome — peroxisome. = microbody (см.). (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • peroxisome — ☆ peroxisome [pər äk′si sōm΄ ] n. [< PEROXIDE + SOME3] any of a group of organelles in some cells of mammals, the leaves of plants, etc., containing enzymes that produce and then decompose hydrogen peroxide: thought to be involved in cellular… …   English World dictionary

  • Peroxisome — Peroxisomes are ubiquitous organelles in eukaryotes that participate in the metabolism of fatty acids and other metabolites. Peroxisomes have enzymes that rid the cell of toxic peroxides. They have a single lipid bilayer membrane that separates… …   Wikipedia

  • peroxisome — noun Etymology: peroxide + 3 some Date: 1965 a cytoplasmic cell organelle containing enzymes (as catalase) which act in oxidative reactions and especially in the production and decomposition of hydrogen peroxide • peroxisomal adjective …   New Collegiate Dictionary

  • Péroxisome — Peroxysome Structure d une cellule de plante, les peroxysomes sont indiqués en bleu sous la lettre i Un peroxysome est un organite cellulaire entouré par une membrane simple et ne contenant pas de matériel génétique. Par opposition à la… …   Wikipédia en Français

  • peroxisome — Organelle containing peroxidase and catalase, sometimes as a large crystal. A site of oxygen utilization, but not of ATP synthesis. In plants, associated with chloroplasts in photorespiration and considered to be part of a larger group of… …   Dictionary of molecular biology

  • peroxisome — noun An intracellular organelle found in all eukaryotes (except Archezoa) which is the source of the enzymes that catalyze the production and breakdown hydrogen peroxide, and are responsible for the oxidation of long chain fatty acids …   Wiktionary

  • peroxisome — per·oxi·some …   English syllables

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