Cited by 215Protein Kinase Regulation and GTPase SignalingProtein Tyrosine PhosphatasesMelanoma and MAPK Pathways

A Phosphatase Holoenzyme Comprised of Shoc2/Sur8 and the Catalytic Subunit of PP1 Functions as an M-Ras Effector to Modulate Raf Activity

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Rodriguez-Viciana, Pablo, Oses-Prieto, Juan, Burlingame, Alma, Fried, Mike, McCormick, Frank·2006·Molecular Cell

Abstract

Ras family GTPases (RFGs) are known to share many regulatory and effector proteins. How signaling and biological specificity is achieved is poorly understood. Using a proteomics approach, we have identified a complex comprised of Shoc2/Sur-8 and the catalytic subunit of protein phosphatase 1 (PP1c) as a highly specific M-Ras effector. M-Ras targets Shoc2-PP1c to stimulate Raf activity by dephosphorylating the S259 inhibitory site of Raf proteins bound to other molecules of M-Ras or Ras. Therefore, distinct RFGs, through independent effectors, can regulate different steps in the activation of Raf kinases. Shoc2 function is essential for activation of the MAPK pathway by growth factors. Furthermore, in tumor cells with Ras gene mutations, inhibition of Shoc2 expression inhibits MAPK, but not PI3K activity. We propose that the Shoc2-PP1c holoenzyme provides an attractive therapeutic target for inhibition of the MAPK pathway in cancer.

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Crossref · 10.1016/j.molcel.2006.03.027

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Authors
Rodriguez-Viciana, P., Oses-Prieto, J., Burlingame, A., Fried, M., & McCormick, F.
Affiliations
University of California, San Francisco (US)
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2006-04
Volume
22
Issue
2
Pages
217-230
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2049992341
Cited by
215
References
39
Citations by year
2026: 10 · 2025: 11 · 2024: 18 · 2023: 8 · 2022: 20 · 2021: 10 · 2020: 6 · 2019: 15 · 2018: 11 · 2017: 7 · 2016: 16 · 2015: 9 · 2014: 12 · 2013: 9 · 2012: 14
FWCI
2.31
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • National Institutes of Health (1s10rr012961-01)
  • National Center for Research Resources (RR015804, RR 001614, RR-012961, P41RR001614, S10RR015804)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Melanoma and MAPK Pathways
Keywords
Ras family GTPases, MAPK pathway activation, oncogenic Ras mutations, cancer therapy targets, Ras effectors
MeSH terms
Carcinoma, Cell Line, Colonic Neoplasms, Electrophoresis, Polyacrylamide Gel, Enzyme Activation, Epidermal Growth Factor, Fibroblast Growth Factors, HeLa Cells, Humans, Phosphoric Monoester Hydrolases, Phosphoprotein Phosphatases, Precipitin Tests, Repressor Proteins, Retroviridae, Mass Spectrometry, Blotting, Western, Protein Structure, Tertiary, ras Proteins, Proto-Oncogene Proteins c-raf, Holoenzymes, Catalytic Domain, Mitogen-Activated Protein Kinases, RNA Interference, RNA, Small Interfering, Proteomics, HCT116 Cells, Intracellular Signaling Peptides and Proteins, Green Fluorescent Proteins, Protein Phosphatase 1

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