Carboxyl-Terminal Modulator Protein (CTMP), a Negative Regulator of PKB/Akt and v-Akt at the Plasma Membrane

S-M Maira; I. Galetic; D.P. Brazil; S. Kaech; E. Ingley; M. Thelen; B.A. Hemmings

doi:10.1126/science.1062030

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Carboxyl-Terminal Modulator Protein (CTMP), a Negative Regulator of PKB/Akt and v-Akt at the Plasma Membrane

Journal article

Peer reviewed

Carboxyl-Terminal Modulator Protein (CTMP), a Negative Regulator of PKB/Akt and v-Akt at the Plasma Membrane

S-M Maira, I. Galetic, D.P. Brazil, S. Kaech, E. Ingley, M. Thelen and B.A. Hemmings

Science, Vol.294(5541), pp.374-380

2001

DOI: https://doi.org/10.1126/science.1062030

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Abstract

The PKB (protein kinase B, also called Akt) family of protein kinases plays a key role in insulin signaling, cellular survival, and transformation. PKB is activated by phosphorylation on residues threonine 308, by the protein kinase PDK1, and Serine 473, by a putative serine 473 kinase. Several protein binding partners for PKB have been identified. Here, we describe a protein partner for PKBα termed CTMP, or carboxyl-terminal modulator protein, that binds specifically to the carboxyl-terminal regulatory domain of PKBα at the plasma membrane. Binding of CTMP reduces the activity of PKBα by inhibiting phosphorylation on serine 473 and threonine 308. Moreover, CTMP expression reverts the phenotype of v-Akt-transformed cells examined under a number of criteria including cell morphology, growth rate, and in vivo tumorigenesis. These findings identify CTMP as a negative regulatory component of the pathway controlling PKB activity.

Details

Title: Carboxyl-Terminal Modulator Protein (CTMP), a Negative Regulator of PKB/Akt and v-Akt at the Plasma Membrane
Authors/Creators: S-M Maira (Author/Creator) - Friedrich Miescher Institute
I. Galetic (Author/Creator) - Friedrich Miescher Institute
D.P. Brazil (Author/Creator) - Friedrich Miescher Institute
S. Kaech (Author/Creator) - Friedrich Miescher Institute
E. Ingley (Author/Creator) - Friedrich Miescher Institute
M. Thelen (Author/Creator) - Institute for Research in Biomedicine
B.A. Hemmings (Author/Creator) - Friedrich Miescher Institute
Publication Details: Science, Vol.294(5541), pp.374-380
Identifiers: 991005541663307891
Murdoch Affiliation: Murdoch University
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 1 Clinical & Life Sciences; 1.25 Molecular & Cell Biology - Cancer, Autophagy & Apoptosis; 1.25.803 PI3K/AKT/mTOR Pathway
Web Of Science research areas: Biochemistry & Molecular Biology
ESI research areas: Molecular Biology & Genetics