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NSPc1, a mainly nuclear localized protein of novel PcG family members, has a transcription repression activity related to its PKC phosphorylation site at S183
Author(s) -
Gong Yanhua,
Wang Xu,
Liu Jin,
Shi Lei,
Yin Bin,
Peng Xiaozhong,
Qiang Boqin,
Yuan Jiangang
Publication year - 2005
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2004.11.056
Subject(s) - psychological repression , nuclear localization sequence , phosphorylation , protein kinase c , transcription (linguistics) , biology , transcription factor , nuclear protein , cell nucleus , subcellular localization , microbiology and biotechnology , hela , nucleus , cell culture , gene , gene expression , genetics , cytoplasm , linguistics , philosophy
Nervous system polycomb 1 (NSPc1) shares high homology with vertebrate PcG proteins Mel‐18 and Bmi‐1. The mRNA of NSPc1 is highly expressed in the developmental nervous system [Mech. Dev. 102 (2001) 219–222]. However, the functional characterization of NSPc1 protein is not clear. In the present study, using Western blotting technique, we aimed to describe the distributions of NSPc1 protein in rat tissues and cell lines. The subcellular localization of NSPc1 was examined in HeLa and SH‐SY5Ycell lines, and its transcriptional repression activity was examined in COS‐7 cell line. We found that the NSPc1 protein was localized mainly in the nucleus. NSPc1 remarkably repressed the transcription. Most interestingly, both the C‐terminal of NSPc1 and two phosphorylation sites in the C‐terminal, especially the PKC phosphorylation site at S183, were important in mediating transcription repression. Taken together, results from our study suggest that NSPc1, as a typical PcG family member, has powerful transcriptional repression ability, which may be related to the PKC signaling pathway.