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The transforming gene product encoded by Moloney murine sarcoma virus clone 124, p37mos, contains a lysine residue (lysine-121) that is conserved among all members of the protein kinase family. This lysine has been shown to be part of a conserved ATP-binding site in both the catalytic subunit of the cAMP-dependent protein kinase and p60v-src. We wished to determine whether this lysine is required for the transforming activity of p37mos. Two site-specific mutations were therefore constructed, which result in the substitution of an aspartic acid or arginine codon in place of the codon for lysine-121. Both mutations abolished the ability of the mos gene to transform cells. These results show that lysine-121 is required for the ability of p37mos to transform cells and provide evidence for an ATP-binding site in p37mos. Furthermore, these results suggest that the conserved lysine residue is specifically involved in the catalytic activity of protein kinases in general.

Lysine residue 121 in the proposed ATP-binding site of the v-mos protein is required for transformation.