PMID:6853496: Difference between revisions
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|{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=6853496 PubMed] | |{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=6853496 PubMed] | ||
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Revision as of 22:44, 25 April 2008
Miura, S, Mori, M and Tatibana, M (1983) Transport of ornithine carbamoyltransferase precursor into mitochondria. Stimulation by potassium ion, magnesium ion, and a reticulocyte cytosolic protein(s).J. Biol. Chem. 258:6671-4
| Abstract | The precursor of rat liver ornithine carbamoyltransferase (EC 2.1.3.3) synthesized in vitro was taken up and processed to the mature enzyme by isolated rat liver mitochondria. Potassium ion, magnesium ion, and a reticulocyte cytosolic protein(s), in addition to the precursor and the mitochondria, were required for maximal transport and processing of the precursor. The concentrations of potassium and magnesium ions required for maximal transport and processing were about 120 and 0.8-1.6 mM, respectively. Dialyzed postribosomal supernatant of rabbit reticulocyte lysate (36 mg of protein/ml), in combination with potassium and magnesium ions, stimulated the transport and processing severalfold. The stimulatory activity of the dialyzed lysate was inactivated by trypsin treatment or heating at 100 degrees C for 2 min. No significant amount of the precursor was associated with the mitochondria when incubation was performed in the absence of these components. These results suggest that potassium ion, magnesium ion, and a reticulocyte cytosolic protein(s) stimulate the binding and transport of the ornithine carbamoyltransferase precursor to the mitochondria. Dialyzed supernatant of rabbit erythrocyte lysate was equally effective in stimulating the precursor transport and processing, and a dialyzed cytosol fraction of Ehrlich ascites cells was partly stimulatory. On the other hand, dialyzed cytosol fractions of rat liver and rat kidney, and dialyzed supernatant of wheat germ extracts did not stimulate the precursor transport and processing but rather inhibited it. |
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