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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

2000; Elsevier BV; Volume: 273; Issue: 2 Linguagem: Inglês

10.1006/bbrc.2000.2992

1090-2104

Masaaki Waragai, Eunsung Junn, Masunori Kajikawa, Shintaro Takeuchi, Ichiro Kanazawa, Masao Shibata, M. Maral Mouradian, Hitoshi Okazawa,

Ubiquitin and proteasome pathways

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.