Segmentation gene product Fushi Tarazu is an LXXLL motif-dependent coactivator for orphan receptor FTZ-F1

Taiga Suzuki, Haruhisa Kawasaki, Ruth T. Yu, Hitoshi Ueda, Kazuhiko Umesono

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19 Citations (Scopus)


Orphan receptors for whom cognate ligands have not yet been identified form a large subclass within the nuclear receptor superfamily. To address one aspect of how they might regulate transcription, we analyzed the mode of interaction between the Drosophila orphan receptor FTZ-F1 (NR5A3) and a segmentation gene product Fushi tarazu (FTZ). Strong interaction between these two factors was detected by use of the mammalian one- and two-hybrid interaction assays without addition of ligand. This interaction required the AF-2 core and putative ligand-binding domain of FTZ-F1 and the LXXLL motif of FTZ. The requirement of these elements was further confirmed by examination of their target gene expression in Drosophila embryos and observation of a cuticle phenotype in transgenic fly lines that express mutated factors. In Drosophila cultured cells, FTZ is required for FTZ-F1 activation of a FTZ-F1 reporter gene. These results reveal a resemblance in the mode of interaction between FTZ-F1 and FTZ and that of nuclear receptor-coactivator and indicate that direct interaction is required for regulation of gene expression by FTZ-F1. Thus, we propose that FTZ may represent a category of LXXLL motif-dependent coactivators for nuclear receptors.

Original languageEnglish
Pages (from-to)12403-12408
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number22
Publication statusPublished - Oct 23 2001
Externally publishedYes

ASJC Scopus subject areas

  • General


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