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Mol. Cell. Biol., Aug 1995, 4125-4135, Vol 15, No. 8
Copyright © 1995, American Society for Microbiology

Regulation of Raf-1 and Raf-1 mutants by Ras-dependent and Ras- independent mechanisms in vitro [published erratum appears in Mol Cell Biol 1995 Sep;15(9):5203]

P Dent, DB Reardon, DK Morrison and TW Sturgill
Howard Hughes Medical Institute, University of Virginia, Charlottesville 22908, USA.

The serine/threonine kinase Raf-1 functions downstream from Ras to activate mitogen-activated protein kinase kinase, but the mechanisms of Raf-1 activation are incompletely understood. To dissect these mechanisms, wild-type and mutant Raf-1 proteins were studied in an in vitro system with purified plasma membranes from v-Ras- and v-Src- transformed cells (transformed membranes). Wild-type (His)6- and FLAG- Raf-1 were activated in a Ras- and ATP-dependent manner by transformed membranes; however, Raf-1 proteins that are kinase defective (K375M), that lack an in vivo site(s) of regulatory tyrosine (YY340/341FF) or constitutive serine (S621A) phosphorylation, that do not bind Ras (R89L), or that lack an intact zinc finger (CC165/168SS) were not. Raf- 1 proteins lacking putative regulatory sites for an unidentified kinase (S259A) or protein kinase C (S499A) were activated but with apparently reduced efficiency. The kinase(s) responsible for activation by Ras or Src may reside in the plasma membrane, since GTP loading of plasma membranes from quiescent NIH 3T3 cells (parental membranes) induced de novo capacity to activate Raf-1. Wild-type Raf-1, possessing only basal activity, was not activated by parental membranes in the absence of GTP loading. In contrast, Raf-1 Y340D, possessing significant activity, was, surprisingly, stimulated by parental membranes in a Ras- independent manner. The results suggest that activation of Raf-1 by phosphorylation may be permissive for further modulation by another membrane factor, such as a lipid. A factor(s) extracted with methanol- chloroform from transformed membranes or membranes from Sf9 cells coexpressing Ras and SrcY527F significantly enhanced the activity of Raf-1 Y340D or active Raf-1 but not that of inactive Raf-1. Our findings suggest a model for activation of Raf-1, wherein (i) Raf-1 associates with Ras-GTP, (ii) Raf-1 is activated by tyrosine and/or serine phosphorylation, and (iii) Raf-1 activity is further increased by a membrane cofactor.


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