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Cell Growth & Differentiation, Vol 2, Issue 12 609-617, Copyright © 1991 by American Association of Cancer Research


ARTICLES

The Raf-1 serine-threonine kinase is a substrate for the p56lck protein tyrosine kinase in human T-cells

PA Thompson, JA Ledbetter, UR Rapp and JB Bolen
Laboratory of Tumor Virus Biology, National Cancer Institute, Bethesda, Maryland 20892.

The CD4 receptor subserves both adhesion and signal transduction functions on CD4+ T-lymphocytes. CD4 is physically associated with the src-related protein tyrosine kinase p56lck. Cell surface engagement of CD4 leads to enzymatic activation of the associated p56lck and the phosphorylation of T-cell proteins on tyrosine residues. We have identified a 72-74kD protein phosphorylated on tyrosine residues following activation of CD4-associated p56lck as the serine-threonine kinase Raf-1. The demonstration that Raf-1 is a substrate for the CD4/p56lck receptor system in normal cells suggests that receptor and nonreceptor classes of protein tyrosine kinases can independently engage functionally overlapping signal transduction pathways.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1991 by the American Association of Cancer Research.