RT Journal Article SR Electronic T1 A retroviral oncogene, akt, encoding a serine-threonine kinase containing an SH2-like region JF Science JO Science FD American Association for the Advancement of Science SP 274 OP 277 DO 10.1126/science.1833819 VO 254 IS 5029 A1 Bellacosa, A A1 Testa, A1 Staal, SP A1 Tsichlis, PN YR 1991 UL http://science.sciencemag.org/content/254/5029/274.abstract AB The v-akt oncogene codes for a 105-kilodalton fusion phosphoprotein containing Gag sequences at its amino terminus. Sequence analysis of v-akt and biochemical characterization of its product revealed that it codes for a protein kinase C-related serine-threonine kinase whose cellular homolog is expressed in most tissues, with the highest amount found in thymus. Although Akt is a serine-threonine kinase, part of its regulatory region is similar to the Src homology-2 domain, a structural motif characteristic of cytoplasmic tyrosine kinases that functions in protein-protein interactions. This suggests that Akt may form a functional link between tyrosine and serine-threonine phosphorylation pathways.