Synthesis and expression of a synthetic gene for the activated human c-Ha-ras protein

A 576 base-pair DNA encoding human c-Ha-ras protein (p21) with a valine codon at position 12 has been synthesized by ligation of chemically synthesized oligodeoxyribonucleotides. The duplex was inserted into a plasmid with the E. coli tryptophan promoter and was expressed in E. coli efficiently.