| Title: | Activation of mitogen-activated protein kinase cascades by p21-activated protein kinases in cell-free extracts of Xenopus oocytes |
| Author(s): | Polverino A; Frost J; Yang P; Hutchison M; Neiman AM; Cobb MH; Marcus S; |
| Address: | "Department of Protein Structure, Amgen Inc., Thousand Oaks, California 91320-1789, USA" |
| ISSN/ISBN: | 0021-9258 (Print) 0021-9258 (Linking) |
| Abstract: | "In the evolutionarily distant yeasts Saccharomyces cerevisiae and Schizosaccharomyces pombe, genetic evidence suggests that activation of pheromone-induced mitogen-activated protein kinase (MAPK) cascades involves the function of the p21cdc42/racl-activated protein kinases (PAKs) Ste20 and Shk1, respectively. In this report, we show that purified Ste20 and Shk1 were each capable of inducing p42MAPK activation in cell-free extracts of Xenopus laevis oocytes, while a mammalian Ste20/Shk1-related protein kinase, p65pak (Pak1), did not induce activation of p42MAPK. In contrast to p42MAPK, activation of JNK/SAPK in Xenopus oocyte extracts was induced by both the yeast Ste20 and Shk1 kinases, as well as by mammalian Pak1. Our results demonstrate that MAPK cascades that are responsive to PAKs are conserved in higher eukaryotes and suggest that distinct PAKs may regulate distinct MAPK modules" |
| Keywords: | "Animals Base Sequence Calcium-Calmodulin-Dependent Protein Kinases/*metabolism Cell Cycle Proteins/*metabolism Cell-Free System Cloning, Molecular DNA Primers Enzyme Activation Female GTP-Binding Proteins/*metabolism Intracellular Signaling Peptides and P;" |
| Notes: | "MedlinePolverino, A Frost, J Yang, P Hutchison, M Neiman, A M Cobb, M H Marcus, S eng Research Support, U.S. Gov't, P.H.S. 1995/11/03 J Biol Chem. 1995 Nov 3; 270(44):26067-70. doi: 10.1074/jbc.270.44.26067" |
