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The sequences encoding the 21-kilodalton transforming protein (p21 ras) of Harvey murine sarcoma virus have previously been localized genetically to a 1.3-kilobase segment of the viral DNA (E. H. Chang, R. W. Ellis, E. M. Scolnick, and D. R. Lowy, Science 210:1249-1251, 1980). Within this segment, DNA sequence analysis has found a single open reading frame large enough to encode the viral p21 (R. Dhar, R. W. Ellis, T. Y. Shih, S. Oroszlan, B. Shapiro, J. Maizel, D. Lowy, and E. M. Scolnick, Science 217:934-937, 1982). There are three potential in-frame ATG initiation codons at the 5' end of this open reading frame. By constructing a mutant of Harvey murine sarcoma virus DNA from which the first two ATG codons of this open reading frame have been deleted, we now show by transfection of the mutant viral DNA into NIH 3T3 cells that only the third ATG codon is necessary and sufficient for synthesis of the viral p21 and for cellular transformation.

Further genetic localization of the transforming sequences of the p21 v-ras gene of Harvey murine sarcoma virus