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Identification of a conserved phosphorylation site modulating nuclear lamin polymerization
1Department of Pharmacological Sciences, SUNY at Stony Brook, NY 11794-8651, USA. Stuurman@ubaclu.unibas.ch
FEBS Letters
|January 20, 1997
Summary
Nuclear lamins disassemble through phosphorylation. Both cdc2 kinase and cAMP-dependent kinase can inhibit lamin polymerization, suggesting multiple disassembly pathways exist in vivo.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Nuclear lamins form polymers essential for nuclear structure.
- Mitotic lamin disassembly is a key event in cell division.
- Phosphorylation by specific kinases triggers lamin disassembly.
Purpose of the Study:
- To investigate the effect of phosphorylation on lamin head-to-tail binding.
- To determine if multiple kinases can regulate lamin polymer disassembly.
- To understand the molecular mechanisms of nuclear lamin dynamics.
Main Methods:
- In vitro polymerization assays using Drosophila nuclear lamin Dm0 fragments.
- Co-immunoprecipitation assays to study protein interactions.
- Site-directed mutagenesis to analyze phosphorylation sites (serine-42 and serine-50).
Main Results:
- Phosphorylation of serine-42 by cdc2 kinase inhibited lamin head-to-tail binding.
- Phosphorylation of serine-50 by cAMP-dependent kinase also inhibited head-to-tail binding.
- These findings indicate that distinct phosphorylation events can disrupt lamin polymer structure.
Conclusions:
- Nuclear lamin disassembly involves phosphorylation at specific serine residues.
- Both cdc2 kinase and cAMP-dependent kinase can mediate lamin disassembly.
- Multiple signaling pathways may regulate nuclear lamin dynamics during mitosis.