Abstract
Close lateral membrane associations of peroxisomes with endoplasmic reticulum are a common feature in bovine kidney cortex epithelial cells. Isolated highly purified peroxisome preparations from this tissue showed a remarkable and persistent copurification of peroxisomal marker enzymes with small amounts (5%) of the microsomal reference enzymes esterase and glucose-6-phosphatase. Contamination with mitochondrial and lysosomal markers was negligible. Ultrastructural examination of such preparations revealed a peculiar association of vesicles or short tubular segments with the peroxisomal membrane. Short electron dense crossbridges seemed to maintain their structural association. The cytochemical localization of glucose-6-phosphatase in peroxisome-associated membrane structures confirmed their derivation from endoplasmic reticulum. The metabolic significance of such structural peroxisome-endoplasmic reticulum associations is discussed.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Biomembranes
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