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The alpha subunit of a plant mitochondrial F1-ATPase is translated in mitochondria


The alpha subunit of a plant mitochondrial F1-ATPase is translated in mitochondria



Journal of Biological Chemistry 258(14): 8524-8526



ISSN/ISBN: 0021-9258

PMID: 6223032

The mitochondrial F1-ATPase from bean (Vicia faba L.) was solubilized by a chloroform treatment of mitochondrial membranes and purified by centrifugation on a glycerol gradient. The active fraction contained 5 subunits: alpha (Mr = 52,000), beta (Mr = 51,000), gamma (Mr = 34,000), delta (Mr = 23,800), and epsilon (Mr = 22,900). Purified coupled mitochondria were incubated in the presence of [ 35S ]methionine and malate to allow mitochondrial translation to occur. The largest labeled polypeptide (Mr = 52,000) was present in the chloroform extract, co-sedimented with the F1-ATPase on glycerol gradient and co-migrated with the alpha subunit upon two-dimensional electrophoresis. The results indicate that the alpha subunit of bean mitochondrial ATPase is translated on mitoribosomes, in contrast to the situation in other organisms.

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Accession: 044556539

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