A novel assay for the measurement of Raf-1 kinase activity.

Abstract:

:Raf-1 is a serine-threonine protein kinase that functions as a central component of the mitogen-activated protein kinase signal transduction pathway. Raf-1 activity is currently assayed in vitro by either measuring 32P incorporation into MEK, Raf-1's only characterized substrate, or by using the phosphorylated MEK to initiate a coupled assay culminating in the phosphorylation of myelin basic protein by MAP kinase. These assays are plagued by a potential lack of specificity in the case of the former, and the time consuming and error-prone nature of the later indirect assay. In this report, we demonstrate a novel single step assay for Raf-1 kinase activity based on phosphorylation of recombinant MEK-1, detected using an activation-specific MEK antibody that recognizes MEK only when specifically phosphorylated by Raf-1 on Ser 217 and Ser 221. The assay readily detected stem cell factor-mediated Raf-1 activation. MEK phosphorylation by immunoprecipitated Raf-1 plateaued at 10 min following initiation of the kinase reaction and was completely dependent on the inclusion of Raf-1. There was a linear correlation between the degree of MEK phosphorylation and the amount of Raf-1 protein immunoprecipitated. In addition to detecting growth factor-mediated activation, the assay was also able to detect paclitaxel-mediated Raf-1 activation. This assay is rapid, sensitive, and specific and therefore is a marked improvement over currently utilized techniques.

journal_name

Oncogene

journal_title

Oncogene

authors

Bondzi C,Grant S,Krystal GW

doi

10.1038/sj.onc.1203862

subject

Has Abstract

pub_date

2000-10-12 00:00:00

pages

5030-3

issue

43

eissn

0950-9232

issn

1476-5594

journal_volume

19

pub_type

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