Enables poly(U) RNA binding activity. Predicted to be involved in regulation of alternative mRNA splicing, via spliceosome. Predicted to act upstream of or within cellular response to oxidative stress. Predicted to be located in nuclear speck. Predicted to be active in nucleus. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; sensory organ; and skeleton. Orthologous to human RBM11 (RNA binding motif protein 11). [provided by Alliance of Genome Resources, Apr 2022]