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Subcellular localization of RPB5-mediating protein and its putative functional partner
Luvsanjav Delgermaa1, Naoyuki Hayashi, Dorjbal Dorjsuren
1Department of Molecular Oncology, Cancer Research Institute, Kanazawa University, Takara-machi 13-1, Kanazawa 920-0934, Japan.
Molecular and Cellular Biology
|September 16, 2004
Summary
RPB5-mediating protein (RMP) localization is controlled by its nuclear localization signal (NLS) and cytoplasmic localization signal (CLS). DNA methyltransferase 1-associating protein (DMAP1) enhances RMP
Area of Science:
- Cellular Biology
- Molecular Biology
- Virology
Background:
- RPB5-mediating protein (RMP) is a novel cellular protein with corepressor activity.
- RMP antagonizes transcriptional modulation by the hepatitis B virus X protein.
Purpose of the Study:
- To investigate the subcellular localization of RMP.
- To identify proteins interacting with RMP and influencing its function.
Main Methods:
- Subcellular localization studies using green fluorescent protein-fused RMP.
- Yeast two-hybrid screening to identify RMP-interacting proteins.
- Functional assays to assess corepressor activity.
Main Results:
- RMP localization is determined by a nuclear localization signal (NLS) and a dominant cytoplasmic localization signal (CLS).
- DNA methyltransferase 1-associating protein (DMAP1) binds to RMP's coiled-coil (CC) domain.
- DMAP1 enhances RMP's nuclear localization and corepressor activity.
Conclusions:
- The interplay between NLS and CLS dictates RMP's subcellular distribution.
- DMAP1 acts as a corepressor, facilitating RMP's nuclear import and function.
- Findings provide insights into RMP's role in transcriptional regulation and potential viral interactions.