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. 1979 Oct;76(10):5071–5075. doi: 10.1073/pnas.76.10.5071

Cell-free synthesis and processing of a putative precursor for mitochondrial carbamyl phosphate synthetase I of rat liver

Masataka Mori *, Satoshi Miura *, Masamiti Tatibana *, Philip P Cohen †
PMCID: PMC413081  PMID: 228276

Abstract

Total RNA or poly(A)+ RNA of rat liver was translated in a rabbit reticulocyte or wheat germ protein-synthesizing system and the carbamyl phosphate synthetase I [carbamoyl-phosphate synthetase (ammonia); carbon dioxide: ammonia ligase (ADP-forming, carbamate-phosphorylating), EC 6.3.4.16] synthesized was isolated by indirect immunoprecipitation by using antibody purified on enzyme-bound Sepharose and Staphylococcus aureus cells. The in vitro product moved on sodium dodecyl sulfate/polyacrylamide gels as a polypeptide that was about 5000 daltons larger than the subunit of the mature enzyme (160,000 daltons). The same polypeptide was also obtained by direct immunoprecipitation or by a double-antibody precipitation method. The mature enzyme competed effectively with the in vitro product for interaction with anti-carbamyl phosphate synthetase I antibody. Digestion of the in vitro product by S. aureus protease gave a pattern of peptide fragments similar to that of the mature enzyme. A mitochondrial membrane preparation from rat liver converted the in vitro product into a polypeptide that comigrated with the mature subunit on sodium dodecyl sulfate gel electrophoresis. Similar proteolytic activity was not detected in either a cytosol or a microsomal fraction of rat liver. These results indicate that the enzyme is synthesized as a larger precursor which is converted to the mature form of enzyme by posttranslational processing.

Keywords: reticulocyte lysate system, immunoprecipitation, mitochondrial matrix enzyme, protein import into mitochondria, carbamoyl-phosphate synthetase (ammonia)

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