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Regulation of phosphorylation pathways by p21 GTPases

The p21 Ras-related Rho subfamily and its role in phosphorylation signalling pathways

  • Chapter
EJB Reviews 1996

Part of the book series: EJB Reviews ((EJB REVIEWS,volume 1996))

Abstract

The oncogenic Ras p21 GTPases regulate phosphorylation pathways that underlie a wealth of activities, including growth and differentiation, in organisms ranging from yeast to human. In metazoa, growth factors trigger conversion of Ras from an inactive GDP-bound form to an active GTP-bound form. This activation of Ras leads to activation of Raf. Raf is one of the initial kinases in the cytoplasmic mitogen-activated protein kinase (MAPK) cascade, involving extracellular-signal-regulated kinases (ERK), which culminates in nuclear transcription. The Ras-related subfamily of Rho p21s, including Rho, Rac and Cdc42 are similarly active in their GTP-bound forms. These p21s mediate growth-factor-induced morphological changes involving actin-based cellular structures. For example, in mammalian fibroblasts, Rho mediates the formation of cytoskeletal stress fibres induced by lysophosphatidic acid, while Rac mediates the formation of membrane ruffles induced by platelet-derived growth factor, and Cdc42 mediates the formation of peripheral filopodia by bradykinin. In some cases, factor-induced Rac activation results in Rho activation, and factor-induced Cdc42 activation leads to Rac activation, as determined by specific morphological changes. Although separate Cdc42/Rac and Rac/Rho hierarchies exist, these might not extend into a linear form (i.e. Cdc42→Rac→Rho) since Cdc42 and Rho activities may be competitive or even antagonistic. Thus Cdc42-mediated formation of filopodia is accompanied by loss of stress fibres (whose formation is mediated by Rho). Recently, mammalian kinases that bind to the GTP-bound forms of Rho p21s have been isolated. These kinases include the p21-activated serine/threonine kinase (PAK), which is stimulated by binding to Cdc42 and Rac, and the Rho-binding serine/threonine kinase (ROK), which is not as strongly stimulated by binding. These kinases act as effectors for their p21 partners since they can directly affect the reorganization of the relevant actin-containing structures. ROK promotes the formation of Rho-induced actin-containing stress fibres and focal-adhesion complexes, to which the ends of the stress fibres attach. PAK stimulates the disassembly of stress fibres, which has been shown to accompany formation of Cdc42-induced peripheral-actin-containing structures, including filopodia, which with Rac-induced membrane ruffles play a role in cell movement. PAK also fosters loss of focal-adhesion complexes. Thus, there is cooperation between different Rho p21s as well as antagonism, with their associated kinases having a role in the integration of the reorganization of the actin cytoskeleton. The similarity of PAK to the Saccharomyces cerevisiae kinase Ste20p, which initiates the yeast mating/pheromone MAPK cascade, led to experiments showing that Cdc42 regulates Ste20p in this MAPK pathway. This similarity has also led to the demonstration that mammalian Cdc42 and Rac can signal to the nucleus through MAPK pathways. However, c-Jun N-terminal kinase (JNK, stress-activated protein kinase) rather than ERK, is involved. PAK have been implicated in the JNK pathway, but their exact roles are uncertain. Thus members of the Rho subfamily, and kinases that bind to these p21s are intimately involved in immediate morphological processes as well as long-term transcriptional events.

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Abbreviations

ACK:

activated Cdc42-binding kinase

Bcr:

breakpoint cluster region gene product

ERK:

extracellular-signal-regulated kinase

GEF:

guanine-nucleotide-exchange factor

JNK:

c-Jun N-terminal kinase

MAPK:

mitogen-activated protein kinase

MBS:

myosin-binding subunit of myosin phosphatase

MLC:

myosin light chain

PAK:

p21 (Cdc42/Rac)-activated kinase

PAM:

peripheral actin microspikes

PDGF:

platelet-derived growth factor

PH:

pleckstrin homology

PKC:

protein kinase C

PKN:

protein kinase N

ROK:

Rho-binding kinase

RTK:

receptor tyrosine kinase

SH:

Src-homology region

SRE:

serum-response element

EGF:

epidermal-growth factor

GAP:

GTPase-activating protein

FAK:

focal-adhesion kinase

PYK:

proline-rich tyrosine kinase

MST:

mammalian sterile-twenty-like

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  1. Institute of Neurology, 1 Wakefield St., London, WC1N 1PJ, UK

    Louis Lim & Christine Hall

  2. Glaxo-IMCB Group, Institute of Molecular and Cell Biology, National University of Singapore, Singapore

    Louis Lim, Edward Manser & Thomas Leung

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Lim, L., Manser, E., Leung, T., Hall, C. (1996). Regulation of phosphorylation pathways by p21 GTPases. In: EJB Reviews 1996. EJB Reviews, vol 1996. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60659-5_15

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  • DOI: https://doi.org/10.1007/978-3-642-60659-5_15

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