Abstract:
:Human LPTS/PinX1 is a telomerase-inhibitory protein, which binds to the telomere protein Pin2/TRF1 and the catalytic subunit hTERT of telomerase. To explore the proteins that might be involved in the telomerase pathway, we performed a yeast two-hybrid screening with LPTS/PinX1 as the bait. A novel gene, MCRS2, encoding for an isoform of MCRS1/p78 and MSP58 was isolated. The expression of MCRS2 protein is cell-cycle dependent, accumulating in the very early S phase. MCRS2 interacts with LPTS/PinX1 in vitro, in vivo and colocalizes with LPTS/PinX1 in cells. MCRS2 and its amino terminus inhibit telomerase activity in vitro and long-term overexpression of MCRS2 in SMMC-7721 cells results in a gradual and progressive shortening of telomeres. Our findings suggest that MCRS2 might be a linker between telomere maintenance and cell-cycle regulation.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Song H,Li Y,Chen G,Xing Z,Zhao J,Yokoyama KK,Li T,Zhao Mdoi
10.1016/j.bbrc.2004.02.166subject
Has Abstractpub_date
2004-04-16 00:00:00pages
1116-23issue
4eissn
0006-291Xissn
1090-2104pii
S0006291X04004462journal_volume
316pub_type
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