• Register
X
Forgot Password

If you have forgotten your password you can enter your email here and get a temporary password sent to your email.

X

Leaving Community

Are you sure you want to leave this community? Leaving the community will revoke any permissions you have been granted in this community.

No
Yes

Identification of a human endonuclease complex reveals a link between tRNA splicing and pre-mRNA 3' end formation.

tRNA splicing is a fundamental process required for cell growth and division. The first step in tRNA splicing is the removal of introns catalyzed in yeast by the tRNA splicing endonuclease. The enzyme responsible for intron removal in mammalian cells is unknown. We present the identification and characterization of the human tRNA splicing endonuclease. This enzyme consists of HsSen2, HsSen34, HsSen15, and HsSen54, homologs of the yeast tRNA endonuclease subunits. Additionally, we identified an alternatively spliced isoform of SEN2 that is part of a complex with unique RNA endonuclease activity. Surprisingly, both human endonuclease complexes are associated with pre-mRNA 3' end processing factors. Furthermore, siRNA-mediated depletion of SEN2 exhibited defects in maturation of both pre-tRNA and pre-mRNA. These findings demonstrate a link between pre-tRNA splicing and pre-mRNA 3' end formation, suggesting that the endonuclease subunits function in multiple RNA-processing events.

Pubmed ID: 15109492

Authors

  • Paushkin SV
  • Patel M
  • Furia BS
  • Peltz SW
  • Trotta CR

Journal

Cell

Publication Data

April 30, 2004

Associated Grants

None

Mesh Terms

  • Amino Acid Sequence
  • Cell Line
  • Cell Nucleolus
  • Cell Nucleus
  • Consensus Sequence
  • Conserved Sequence
  • Endonucleases
  • Endoribonucleases
  • HeLa Cells
  • Humans
  • Introns
  • Isoenzymes
  • Molecular Sequence Data
  • Protein Subunits
  • RNA Precursors
  • RNA Processing, Post-Transcriptional
  • RNA Splicing
  • RNA, Small Interfering
  • RNA, Transfer
  • Saccharomyces cerevisiae
  • Sequence Homology, Amino Acid