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J Bacteriol. 1990 October; 172(10): 5816-5827

research-article

Association of glyoxylate and beta-oxidation enzymes with peroxisomes of Saccharomyces cerevisiae.

M T McCammon, M Veenhuis, S B Trapp and J M Goodman

Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas 75235.

ABSTRACT

Although peroxisomes are difficult to identify in Saccharomyces cerevisiae under ordinary growth conditions, they proliferate when cells are cultured on oleic acid. We used this finding to study the protein composition of these organelles in detail. Peroxisomes from oleic acid-grown cells were purified on a discontinuous sucrose gradient; they migrated to the 46 to 50% (wt/wt) sucrose interface. The peroxisomal fraction was identified morphologically and by the presence of all of the enzymes of the peroxisomal beta-oxidation pathway. These organelles also contained a significant but minor fraction of two enzymes of the glyoxylate pathway, malate synthase and malate dehydrogenase-2. The localization of malate synthase in peroxisomes was confirmed by immunoelectron microscopy. It is postulated that glyoxylate pathway enzymes are readily and preferentially released from peroxisomes upon cell lysis, accounting for their incomplete recovery from isolated organelles. Small uninduced peroxisomes from glycerol-grown cultures were detected on sucrose gradients by marker enzymes. Under these conditions, catalase, acyl-coenzyme A oxidase, and malate synthase cofractionated at equilibrium close to the mitochondrial peak, indicating smaller, less dense organelles than those from cells grown on oleic acid. Peroxisomal membranes from oleate cultures were purified by buoyant density centrifugation. Three abundant proteins of 24, 31, and 32 kilodaltons were observed.

J Bacteriol. 1990 October; 172(10): 5816-5827




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