Involved in feminization of hermaphroditic germ-line; nuclear mRNA surveillance; and positive regulation of reproductive process. Predicted to be located in nucleus. Predicted to be part of catalytic step 2 spliceosome and exon-exon junction complex. Is an ortholog of human MAGOH (mago homolog, exon junction complex subunit) and MAGOHB (mago homolog B, exon junction complex subunit).