The interaction of SV40 small tumor antigen with protein phosphatase 2A stimulates the map kinase pathway and induces cell proliferation

Estelle Sontag, Sergei Fedorov, Craig Kamibayashi, David Robbins, Melanie Cobb, Marc Mumby

Research output: Contribution to journalArticle

434 Citations (Scopus)

Abstract

Interaction with SV40 small tumor antigen (small t) compromised the ability of multimeric protein phosphatase 2A to inactivate the mitogen-activated protein kinase ERK1 and the mitogen-activated protein kinase kinase MEK1. Transient expression of small t in CV-1 cells activated MEK and ERK but did not affect Raf activity. Small t stimulated the growth of quiescent CV-1 cells almost as effectively as did serum. Coexpression of kinase-deficient ERK2 blocked most, but not all, of the proliferation caused by small t. Activation of the mitogen-activated protein kinase pathway and stimulation of cell growth were dependent on the interaction of small t with protein phosphatase 2A. These findings indicate that SV40 small t is capable of inducing cell growth through blockade of protein phosphatase and deregulation of the mitogen-activated protein kinase cascade.

Original languageEnglish (US)
Pages (from-to)887-897
Number of pages11
JournalCell
Volume75
Issue number5
DOIs
StatePublished - Dec 3 1993

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Protein Phosphatase 2
Cell proliferation
Neoplasm Antigens
Mitogen-Activated Protein Kinases
Phosphotransferases
Mitogen-Activated Protein Kinase Kinases
Cell Proliferation
Cell growth
Deregulation
Growth
Phosphoprotein Phosphatases
MAP Kinase Kinase Kinases
Chemical activation
Serum
1,2-diamino-1,2-N,N'-carbonyl-1,2-dideoxyglucose hydrate

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology

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The interaction of SV40 small tumor antigen with protein phosphatase 2A stimulates the map kinase pathway and induces cell proliferation. / Sontag, Estelle; Fedorov, Sergei; Kamibayashi, Craig; Robbins, David; Cobb, Melanie; Mumby, Marc.

In: Cell, Vol. 75, No. 5, 03.12.1993, p. 887-897.

Research output: Contribution to journalArticle

Sontag, Estelle ; Fedorov, Sergei ; Kamibayashi, Craig ; Robbins, David ; Cobb, Melanie ; Mumby, Marc. / The interaction of SV40 small tumor antigen with protein phosphatase 2A stimulates the map kinase pathway and induces cell proliferation. In: Cell. 1993 ; Vol. 75, No. 5. pp. 887-897.
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