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TFIP11, CCNL1 and EWSR1 Protein-protein Interactions, and Their Nuclear Localization

Sissada Tannukit1, Xin Wen1, HongJun Wang1

  • 1University of Southern California, School of Dentistry, Center for Craniofacial Molecular Biology, 2250 Alcazar Street, CSA room 103, Los Angeles, California 90033-1004, USA.

International Journal of Molecular Sciences
|January 6, 2009
PubMed

Insights

Tuftelin-interacting protein 11 (TFIP11), cyclin L1 (CCNL1), and Ewing sarcoma breakpoint region 1 protein (EWSR1) interact and co-localize in the nucleus. These findings suggest a shared role in pre-mRNA splicing activities.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Tuftelin-interacting protein 11 (TFIP11), cyclin L1 (CCNL1), and Ewing sarcoma breakpoint region 1 protein (EWSR1) are implicated in pre-mRNA splicing.
  • The precise roles of CCNL1 and EWSR1 in spliceosome function remain unclear.
  • TFIP11 is suggested to be involved in spliceosome disassembly.

Purpose of the Study:

  • To investigate the cellular localization and potential functional relationships of TFIP11, CCNL1, and EWSR1.
  • To explore the involvement of these proteins in RNA splicing processes.

Main Methods:

  • Yeast two-hybrid assay (Y2H) to identify protein interactions.
  • Fluorescently-tagged protein expression.
  • Confocal microscopy to determine subcellular localization.

Main Results:

  • Yeast two-hybrid assays identified CCNL1 and EWSR1 as interaction partners of TFIP11.
  • Confocal microscopy revealed frequent co-localization of TFIP11, CCNL1, and EWSR1 in speckled nuclear domains.
  • These proteins are functionally related to the spliceosome and pre-mRNA splicing.

Conclusions:

  • TFIP11, CCNL1, and EWSR1 likely participate together in cellular activities associated with RNA splicing.
  • The observed co-localization supports a shared role in spliceosome-related functions.
Keywords:
Cyclin L1Ewing’s sarcoma proteinnuclear specklespre-mRNA splicingspliceosomal component 35spliceosometuftelin-interacting protein 11

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