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First published online 19 August 2003
doi: 10.1242/jcs.00690

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The Hrp65 self-interaction is mediated by an evolutionarily conserved domain and is required for nuclear import of Hrp65 isoforms that lack a nuclear localization signal

Eva Kiesler¹, Francesc Miralles^1,*, Ann-Kristin Östlund Farrants² and Neus Visa^1,

¹ Department of Molecular Biology and Functional Genomics, Stockholm University, SE-10691 Stockholm, Sweden
² Department of Zoological Cell Biology, The Wenner-Gren Institute, Stockholm University, SE-10691 Stockholm, Sweden

Author for correspondence (e-mail: neus.visa{at}molbio.su.se)

Accepted 28 May 2003

Hrp65, an evolutionary conserved RNA-binding protein from the midge Chironomus tentans, has a conserved DBHS (Drosophila behavior, human splicing) domain that is also present in several mammalian proteins. In a yeast two-hybrid screening we found that Hrp65 can interact with itself. Here we confirm the Hrp65 self-interaction by in vitro pull-down experiments and map the sequences responsible for the interaction to a region that we refer to as the protein-binding domain located within the DBHS domain. We also show that the protein-binding domains of Drosophila NonA and human PSF, two other proteins with conserved DBHS domains, bind to Hrp65 in the yeast two-hybrid system. These observations indicate that the protein-binding domain can mediate homodimerization of Hrp65 as well as heterodimerization between different DBHS-containing proteins. Moreover, analyses of recombinant Hrp65 by gel-filtration chromatography show that Hrp65 can not only dimerize but also oligomerize into complexes of at least three to six molecules. Furthermore, we have analyzed the functional significance of the Hrp65 self-interaction in cotransfection assays, and our results suggest that the interaction between different Hrp65 isoforms is crucial for their intracellular localization.

Key words: RNA-binding protein, Chironomus tentans, Oligomerization, Yeast two-hybrid, Transfection, Nuclear import

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