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Isolation of Labile Multi-protein Complexes by in vivo Controlled Cellular Cross-Linking and Immuno-magnetic Affinity Chromatography
Published on: March 9, 2010
Structure-function analysis of core STRIPAK Proteins: a signaling complex implicated in Golgi polarization
Michelle J Kean1, Derek F Ceccarelli, Marilyn Goudreault
1Samuel Lunenfeld Research Institute at Mount Sinai Hospital, Toronto, Ontario M5G 1X5, Canada.
The Journal of Biological Chemistry
|May 13, 2011
Summary
Cerebral cavernous malformations (CCMs) involve brain capillary changes. The STRIPAK complex, including CCM3, regulates Golgi positioning, impacting brain health.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Cerebral cavernous malformations (CCMs) are vascular abnormalities in the brain.
- CCM3 protein is implicated in familial CCMs and interacts with the STRIPAK complex.
- The STRIPAK complex comprises serine/threonine phosphatase PP2A and GCKIII kinases (MST4, STK24, STK25).
Purpose of the Study:
- To elucidate the role of CCM3 and striatins within the STRIPAK complex.
- To map the interaction regions between CCM3, striatins, and the kinase/phosphatase components of STRIPAK.
- To investigate the regulation of Golgi localization and positioning by STRIPAK components.
Main Methods:
- Protein interaction mapping.
- Analysis of Golgi localization of MST4.
- Depletion studies of CCM3 and striatins to assess Golgi polarization.
Main Results:
- Striatins and CCM3 act as bridges between the phosphatase and kinase modules of STRIPAK.
- CCM3 and striatins differentially regulate the Golgi localization of MST4.
- Depletion of CCM3 or striatins impacts Golgi polarization in opposing ways.
Conclusions:
- The STRIPAK complex, through CCM3 and striatins, plays a critical role in regulating Golgi positioning.
- STRIPAK controls Golgi positioning by balancing MST4 localization between the Golgi and cytosol.
- Understanding these mechanisms may offer insights into cerebral cavernous malformations.
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