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The adaptor protein soc-1/Gab1 modifies growth factor receptor output in Caenorhabditis elegans

Record type: Article

Previous genetic analysis has shown that dos/soc-1/Gab1 functions positively in receptor tyrosine kinase (RTK) stimulated Ras/Map kinase signaling, through the recruitment of csw/ptp-2/Shp2. Using sensitised assays in Caenorhabditis elegans for let-23/Egfr and daf-2/InsR (Insulin receptor-like) signaling, it is shown that soc-1/Gab1 inhibits phospholipase C-gamma (PLCgamma) and phosphatidylinositol 3'-kinase (PI3K) mediated signaling. Furthermore, as well as stimulating Ras/Map kinase signaling, soc-1/Gab1 stimulates a poorly defined signaling pathway that represses class 2 daf-2 phenotypes. In addition, it is shown that SOC-1 binds the C-terminal SH3 domain of SEM-5. This binding is likely to be functional as the sem-5(n2195)G201R mutation, which disrupts SOC-1 binding, behaves in a qualitatively similar manner to a soc-1 null allele in all assays for let-23/Egfr and daf-2/InsR signaling examined. Further genetic analysis suggests that ptp-2/Shp2 mediates the negative function of soc-1/Gab1 in PI3K mediated signaling, as well as the positive function in Ras/Map kinase signaling. Other effectors of soc-1/Gab1 are likely to inhibit PLCgamma mediated signaling and stimulate the poorly defined signaling pathway that represses class 2 daf-2 phenotypes. Thus, the recruitment of soc-1/Gab1, and its effectors, into the RTK signaling complex modifies the cellular response by enhancing Ras/Map kinase signaling whilst inhibiting PI3K and PLCgamma mediated signaling.

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Citation

Hopper, Neil A. (2006) The adaptor protein soc-1/Gab1 modifies growth factor receptor output in Caenorhabditis elegans Genetics, 173, (1), pp. 163-175. (doi:10.1534/genetics.106.055822).

More information

Published date: 24 May 2006
Keywords: c. elegans, gab1, egfr, insulin receptor, signal transduction

Identifiers

Local EPrints ID: 32823
URI: http://eprints.soton.ac.uk/id/eprint/32823
ISSN: 1943-2631
PURE UUID: 864e48e7-f3fe-45df-8d83-615af4fcf248

Catalogue record

Date deposited: 15 May 2006
Last modified: 17 Jul 2017 15:54

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Contributors

Author: Neil A. Hopper

University divisions


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