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. 1988 Feb;7(2):541–546. doi: 10.1002/j.1460-2075.1988.tb02843.x

Replacement of lys 622 in the ATP binding domain of P100gag-mil abolishes the in vitro autophosphorylation of the protein and the biological properties of the v-mil oncogene of MH2 virus.

F Denhez 1, B Heimann 1, L d'Auriol 1, T Graf 1, M Coquillaud 1, J Coll 1, F Galibert 1, K Moelling 1, D Stehelin 1, J Ghysdael 1
PMCID: PMC454352  PMID: 2835233

Abstract

Lysine 622 in the ATP-binding domain of P100gag-mil, the translation product of the v-mil oncogene of MH2, has been replaced with methionine using oligonucleotide site-directed mutagenesis. This substitution results in the inactivation of the serine/threonine-specific autophosphorylation of P100gag-mil in vitro, indicating that this activity is an intrinsic property of the viral protein. This substitution also suppresses two of the biological properties of MH2 which have previously been shown to be dependant upon the expression of v-mil, namely, the production of chicken myelomonocytic growth factor (cMGF) by v-myc-transformed chicken macrophages and the sustained proliferation of chicken neuroretina cells. These data strongly suggest that the biological properties of v-mil are mediated by the phosphorylation at serine/threonine residues of key cellular substrates. In contrast to the in vitro situation, both the mutant and wild-type proteins appear to be phosphorylated at the same sites and to the same extent in either transformed fibroblasts or macrophages. This, together with the fact that the sites phosphorylated in vivo and in vitro are essentially different indicate that most of the phosphate associated with P100gag-mil in transformed cells does not result from an obligate autophosphorylation event but from the phosphorylation by as yet uncharacterized cellular kinase(s).

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Selected References

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