Distinct roles for DH and PH domains in the Lbc oncogene

Olson, M. F. , Sterpetti, P., Nagata, K.-i., Toksoz, D. and Hall, A. (1997) Distinct roles for DH and PH domains in the Lbc oncogene. Oncogene, 15(23), pp. 2827-2831. (doi:10.1038/sj.onc.1201594) (PMID:9419973)

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Abstract

Members of the Dbl-homology (DH) family of proteins promote guanine nucleotide exchange on Rho GTPases. Lbc, which specifically acts on Rho but not Rac or Cdc42, was isolated as a transforming oncogene and is composed of a DH and a Pleckstrin-homology (PH) domain. We show here that the Lbc DH domain alone is capable of stimulating new DNA synthesis in quiescent fibroblasts and Rho-dependent actin stress fiber assembly. However, the PH domain is required for subcellular localization of Lbc along actin stress fibers and for efficient transformation of NIH3T3 cells. The results show that, in contrast to other Dbl-homology proteins, the PH domain of Lbc is dispensable for activation of Rho in vivo. The PH domain-dependent subcellular localization of Lbc may, however, be important for growth factor activation of endogenous Lbc and for oncogenic transformation.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Olson, Professor Michael
Authors: Olson, M. F., Sterpetti, P., Nagata, K.-i., Toksoz, D., and Hall, A.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cancer Sciences
Journal Name:Oncogene
Publisher:Nature Publishing Group
ISSN:0950-9232
ISSN (Online):1476-5594

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