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In vitro synthesis of pp60v-src: myristylation in a cell-free system.

Department of Biology, Moffett Laboratory, Princeton University, New Jersey 08544.

ABSTRACT

Covalent attachment of myristic acid to pp60v-src, the transforming protein of Rous sarcoma virus, was studied in a cell-free system. Using a synthetic peptide containing the first 11 amino acids of the mature pp60v-src polypeptide sequence as a substrate, we probed lysates from a variety of cells and tissues for N-myristyl transferase (NMT) activity. Nearly every eucaryotic cell type tested contained NMT, including avian, mammalian, insect, and plant cells. Since NMT activity was detected in rabbit reticulocyte lysates, we took advantage of the translational capability of these lysates to determine the precise point during translation at which myristate is attached to pp60v-src. src mRNA, transcribed from cloned v-src DNA, was translated in reticulocyte lysates which had been depleted of endogenous myristate. Addition of [3H]myristate to lysates 10 min after the start of synchronized translation resulted in a dramatic decrease in the incorporation of radiolabeled myristate into pp60v-src polypeptide chains. These results imply that although myristate can be attached posttranslationally to synthetic peptide substrates, myristylation in vivo is apparently a very early cotranslational event which occurs before the first 100 amino acids of the nascent polypeptide chain are polymerized.

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