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Nuclear-mitotic apparatus protein: a structural protein interface between the nucleoskeleton and RNA splicing
C Zeng1, D He, S M Berget
1Department of Cell Biology, Baylor College of Medicine, Houston, TX 77030.
Summary
Nuclear-mitotic apparatus protein (NuMA) connects RNA processing to the cell
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Splicing factors in vertebrate cells localize to nuclear speckles.
- The mechanism generating these nuclear speckles is not fully understood.
- Nuclear matrix factors are hypothesized to maintain nuclear organization.
Purpose of the Study:
- To investigate the role of nuclear-mitotic apparatus protein (NuMA) in nuclear organization and RNA processing.
- To determine if NuMA is associated with splicing factors and the nuclear matrix.
Main Methods:
- Immunofluorescence microscopy to observe protein localization.
- Immunoprecipitation assays to identify protein complexes.
- In vitro reconstitution of splicing complexes.
Main Results:
- NuMA colocalizes with splicing factors in interphase nuclei.
- NuMA is part of a complex with small nuclear ribonucleoproteins.
- NuMA associates with reconstituted splicing complexes but not with nonspecific RNA.
Conclusions:
- NuMA plays a role in bridging RNA processing and the nucleoskeleton in interphase cells.
- NuMA-like proteins may be crucial for maintaining the spatial organization of nuclear functions.