Activation of N-ras in a human melanoma cell line.
DNA isolated from cell line Mel Swift, a human melanoma cell line, transforms NIH3T3 cells. Southern blot analysis of DNA from secondary foci revealed conserved 8.8- and 7.8-kilobase EcoRI fragments which hybridized with a human repetitive sequence clone, blur 8. The activated transforming gene was identified as N-ras, and the 8.8-kilobase EcoRI fragment from a secondary transformant was cloned. Synthetic 17-mer oligonucleotides which spanned either the normal codon 61 (CAA) or a mutant codon 61 ( AAA) were used for hybridization. Cloned N-ras from melanoma cell line Mel Swift hybridized to the mutant ( AAA) oligonucleotide. From this we predicted a glutamine-to-lysine substitution in amino acid 61, a change confirmed by conventional sequencing of the first and second exons of N-ras from cell line Mel Swift. Transfection experiments showed that only those recombinant clones with the mutation in position 61 were biologically active.[1]References
- Activation of N-ras in a human melanoma cell line. Padua, R.A., Barrass, N.C., Currie, G.A. Mol. Cell. Biol. (1985) [Pubmed]
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