Recombinant Sex determination protein fox-1 (fox-1)

RNA-binding protein that regulates tissue-specific alternative splicing events by binding to 5'-UGCAUG-3' and 5'-GCACG-3' elements. Also binds to poly(A), poly(G), poly(C), or poly(U) stretches of RNA. Plays a role in the sex determination pathway and X chromosome dosage compensation, and together with sex-1 is involved in making the distinction between one and two X-chromosomes. Binds to 5'-GCAUG-3' and 5'-GCACG-3' elements in intron 6 of the pre-mRNA of the sex-determining factor xol-1 to promote its alternative splicing and together with sex-1 negatively regulates the expression of xol-1 to promote hermaphrodite development. Negatively regulates the expression of the active isoform of xol-1 (isoform b) by promoting intron 6 retention and the deletion of exon 7 coding sequences in hermaphrodite embryos. Furthermore, binding to the pre-mRNA of xol-1 can also direct the use of an alternative 3' splice site enabling the xol-1 transcript to be trans-spliced to unrelated genes on chromosome 2, which also leads to xol-1 exon 7 deletion. Does not seem to regulate the retention of introns 1 to 5 of xol-1 pre-mRNA. Plays a role in the association of the dosage compensation complex proteins dpy-27 and sdc-3 with the hermaphrodite X chromosomes. Binds to 5'-UGCAUG-3' elements in intron 7 of the pre-mRNA of unc-32 to promote its alternative splicing in neuronal tissues. Binds to 5'-UGCAUG-3' elements in intron 4 of the pre-mRNA of egl-15 to promote its alternative splicing in body wall muscle tissues. Promotes binding of RNA-binding protein sup-12 to target RNA. Plays a role in male mating behavior.