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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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Human MCRS2, a cell-cycle-dependent protein, associates with LPTS/PinX1 and reduces the telomere length

Hai Song1, Yiliang Li, Guoyuan Chen

  • 1State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai 200031, China.

Biochemical and Biophysical Research Communications
|March 27, 2004
PubMed

Insights

A novel protein, MCRS2, interacts with telomere-inhibitory protein LPTS/PinX1. MCRS2 inhibits telomerase activity and shortens telomeres, suggesting a role in linking telomere maintenance and cell-cycle regulation.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Human telomerase, composed of LPTS/PinX1 and hTERT, plays a crucial role in telomere maintenance.
  • Telomere length is regulated by various proteins interacting with telomerase.
  • Understanding these interactions is key to comprehending cell-cycle regulation and potential therapeutic targets.

Purpose of the Study:

  • To identify novel proteins involved in the telomerase pathway using LPTS/PinX1 as bait.
  • To characterize the function and interactions of newly identified proteins in relation to telomere maintenance and cell-cycle regulation.

Main Methods:

  • Yeast two-hybrid screening was employed to identify proteins interacting with LPTS/PinX1.
  • In vitro and in vivo interaction studies, including co-localization experiments, were performed.
  • Telomerase activity assays and long-term overexpression studies in SMMC-7721 cells were conducted to assess MCRS2 function.

Main Results:

  • A novel gene, MCRS2, encoding an isoform of MCRS1/p78 and MSP58, was isolated.
  • MCRS2 protein expression is cell-cycle dependent, peaking in early S phase.
  • MCRS2 interacts with LPTS/PinX1 and inhibits telomerase activity in vitro.
  • Overexpression of MCRS2 leads to progressive telomere shortening in SMMC-7721 cells.

Conclusions:

  • MCRS2 is a novel interacting partner of LPTS/PinX1 in the telomerase pathway.
  • MCRS2 exhibits cell-cycle dependent expression and inhibits telomerase activity.
  • MCRS2 may function as a crucial linker between telomere maintenance and cell-cycle regulation.

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