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ELYS regulates the localization of LBR by modulating its phosphorylation state
Yasuhiro Mimura1, Masatoshi Takagi1, Michaela Clever1
1Cellular Dynamics Laboratory, Riken, Saitama 351-0198, Japan.
Journal of Cell Science
|November 2, 2016
Summary
Depleting ELYS protein disrupts nuclear envelope integrity by altering Lamin B receptor (LBR) localization. This occurs via an ELYS-mediated phosphorylation network involving CDK, SRPK, and PP1, crucial for nuclear stability.
Area of Science:
- Cell Biology
- Molecular Biology
- Nuclear Architecture
Background:
- Lamin B receptor (LBR) anchors heterochromatin to the inner nuclear membrane (INM), maintaining nuclear integrity.
- Embryonic large molecule derived from yolk sac (ELYS) is a nuclear pore complex component whose depletion affects LBR localization.
- The precise molecular mechanism linking ELYS to LBR localization remains largely unknown.
Purpose of the Study:
- To elucidate the molecular mechanism by which ELYS influences LBR localization to the INM.
- To investigate the role of protein phosphorylation in regulating LBR localization.
- To identify key kinases and phosphatases involved in the ELYS-LBR regulatory network.
Main Methods:
- Depletion of ELYS and protein phosphatase 1 (PP1) using RNA interference or similar techniques.
- Phosphorylation site analysis of LBR.
- Immunofluorescence microscopy to assess LBR localization.
- Western blotting to detect protein levels and phosphorylation status.
Main Results:
- ELYS depletion significantly increased LBR phosphorylation at sites targeted by cyclin-dependent kinase (CDK) and serine/arginine protein kinases 1 and 2 (SRPK1/2).
- Protein phosphatase 1 (PP1) activity counter-balances these phosphorylation events.
- Depletion of PP1 also resulted in LBR mislocalization, similar to ELYS depletion.
Conclusions:
- A novel ELYS-mediated phosphorylation network regulates LBR localization to the INM.
- This network involves the interplay of ELYS, CDK, SRPK1/2, and PP1.
- Phosphorylation-dependent coordination between INM proteins and the nuclear pore complex is vital for nuclear integrity.
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