%0 Journal Article %A Woznik, Maria %A Rödner, Claudia %A Lemon, Ken %A Rima, Bert %A Mankertz, Annette %A Finsterbusch, Tim %T Mumps virus small hydrophobic protein targets ataxin-1 ubiquitin-like interacting protein (ubiquilin 4) %D 2010 %J Journal of General Virology, %V 91 %N 11 %P 2773-2781 %@ 1465-2099 %R https://doi.org/10.1099/vir.0.024638-0 %I Microbiology Society, %X The small hydrophobic (SH) protein of mumps virus has been reported to interfere with innate immunity by inhibiting tumour necrosis factor alpha-mediated apoptosis. In a yeast two-hybrid screen we have identified the ataxin-1 ubiquitin-like interacting protein (A1Up) as a cellular target of the SH protein. A1Up contains an amino-terminal ubiquitin-like (UbL) domain, a carboxy-terminal ubiquitin-associated (UbA) domain and two stress-inducible heat shock chaperonin-binding (Sti1) motifs. This places it within the ubiquitin-like protein family that is involved in proteasome-mediated activities. Co-immunoprecipitation confirmed the binding of SH and A1Up and demonstrates that a truncated protein fragment corresponding to aa 136–270 of A1Up, which represents the first Sti1-like repeat and an adjacent hydrophobic region, was sufficient for interaction, whereas neither the UbL nor the UbA domains were required for interaction. The ectopic expression of A1Up leads to a redistribution of SH to punctate structures that co-localize with the 20S proteasome in transfected or infected mammalian cells. %U https://www.microbiologyresearch.org/content/journal/jgv/10.1099/vir.0.024638-0