Phosphorylation of Ets1 regulates the complementation of a CSF-1 receptor impaired in mitogenesis.

Abstract:

:Ets1, the founder member of the Ets transcription factor family, is involved in a variety of developmental and cellular processes. Previous studies have shown that serine phosphorylation of Ets1 inhibits its DNA binding activity, suggesting that phosphorylation is important in the regulation of Ets1 function. To further examine Ets1 phosphorylation, we ectopically expressed Ets1 in fibroblasts and stimulated these cells with serum. Using two-dimensional tryptic phosphopeptide analysis and site-directed mutagenesis, we found that Ets1 was phosphorylated on threonine 38, a residue conserved in several Ets proteins. Substitution of this residue with alanine enhanced CSF-1-dependent colony formation in semi-solid medium of NIH3T3 cells expressing a mitogenically defective CSF-1 receptor [Y809F]. Threonine 38 is part of a consensus amino-acid sequence frequently recognized and targeted by members of the MAP kinase family. Moreover, this residue is phosphorylated in vitro by recombinant ERK2, which suggests that the kinase which phosphorylates threonine 38 in vivo is a member of the MAP kinase family. In addition, phosphorylation on threonine 38 seems to negatively regulate Ets1 activity in response to growth-factor stimulation.

journal_name

Oncogene

journal_title

Oncogene

authors

Rabault B,Roussel MF,Quang CT,Ghysdael J

subject

Has Abstract

pub_date

1996-08-15 00:00:00

pages

877-81

issue

4

eissn

0950-9232

issn

1476-5594

journal_volume

13

pub_type

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