Related Experiment Video

Updated: Jun 22, 2026

Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration
10:43

Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration

Published on: May 19, 2016

RASSF2 associates with and stabilizes the proapoptotic kinase MST2

W N Cooper1, L B Hesson, D Matallanas

  • 1Section of Medical and Molecular Genetics, Institute of Biomedical Research, University of Birmingham, Birmingham, UK.

Oncogene
|June 16, 2009
PubMed

Insights

The tumor suppressor RASSF2 binds and stabilizes the proapoptotic kinase MST2. Loss of RASSF2 in tumors destabilizes MST2, reducing the cell

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • The Ras association domain family (RASSF) proteins function as tumor suppressors.
  • RASSF2 contains Ras association and SARAH domains, crucial for protein interactions.
  • Proapoptotic kinases MST1 and MST2 are key regulators of cell death pathways.

Purpose of the Study:

  • To investigate the interaction between RASSF2 and MST1/2 kinases.
  • To elucidate the functional consequences of RASSF2-MST interactions in cancer.
  • To understand the role of RASSF2 in regulating MST2 stability and apoptotic potential.

Main Methods:

  • Co-immunoprecipitation assays to confirm RASSF2-MST1/2 binding.
  • In vitro kinase assays to assess RASSF2 phosphorylation by MST1/2.
  • Immunofluorescence microscopy to determine subcellular localization of RASSF2 and MST2.
  • Western blotting to analyze MST2 protein levels in response to RASSF2 expression or knockdown.
  • Analysis of RASSF2 and MST2 levels in colorectal tumor samples.

Main Results:

  • RASSF2 directly binds to and immunoprecipitates active MST1 and MST2 kinases.
  • RASSF2 is phosphorylated by a kinase likely to be MST1/2.
  • RASSF2 and MST2 colocalize in the cytoplasm upon complex formation.
  • RASSF2 expression increases MST2 levels, while RASSF2 knockdown decreases MST2 levels.
  • Low RASSF2 levels in colorectal tumors correlate with decreased MST2 protein levels, suggesting RASSF2 protects MST2 from degradation.

Conclusions:

  • RASSF2 and MST2 form an active complex in vivo.
  • RASSF2 phosphorylation and protection of MST2 from degradation are key functions.
  • Loss of RASSF2 in tumors leads to MST2 destabilization and reduced apoptotic potential.
  • This interaction highlights a novel mechanism linking RASSF2 tumor suppression to apoptotic regulation via MST2 stability.

More Related Videos

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells10:27

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells

Published on: March 9, 2012

Tyramide Signal Amplification for the Immunofluorescent Staining of ZBP1-Dependent Phosphorylation of RIPK3 and MLKL After HSV-1 Infection in Human Cells09:15

Tyramide Signal Amplification for the Immunofluorescent Staining of ZBP1-Dependent Phosphorylation of RIPK3 and MLKL After HSV-1 Infection in Human Cells

Published on: October 20, 2022

Related Concept Videos

PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a rapamycin-insensitive companion...
MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
Microtubule Associated Proteins (MAPs)01:42

Microtubule Associated Proteins (MAPs)

Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
The Ras Gene02:38

The Ras Gene

The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...