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PQBP-1/Npw38, a nuclear protein binding to the polyglutamine tract, interacts with U5-15kD/dim1p via the carboxyl-terminal domain.


PQBP-1 was identified as a binding protein to the polyglutamine tract present in various transcription-related factors and causative genes for neurodegenerative disorders. This novel gene contains at least two functional domains, WW domain and carboxyl-terminal domain (CTD), strictly conserved beyond species. Although human PQBP-1 additionally contains the polar amino acid-rich domain by which it binds to the polyglutamine tract, genuine physiological function(s) have not been clarified. In this study, we showed that U5-15kD, human homologue of fission yeast dim1p, is a partner molecule of PQBP-1 binding to CTD. This finding suggests physiological functions of PQBP-1 in splicing, cell cycle, and ubiquitination, through which we can speculate the pathological roles of PQBP-1 in triplet repeat diseases.

Pubmed ID: 10873650


  • Waragai M
  • Junn E
  • Kajikawa M
  • Takeuchi S
  • Kanazawa I
  • Shibata M
  • Mouradian MM
  • Okazawa H


Biochemical and biophysical research communications

Publication Data

July 5, 2000

Associated Grants


Mesh Terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Binding Sites
  • Carrier Proteins
  • DNA Primers
  • Humans
  • In Vitro Techniques
  • Mice
  • Molecular Sequence Data
  • Nuclear Proteins
  • Peptides
  • Protein Structure, Tertiary
  • Sequence Homology, Amino Acid