Is an ortholog of human MED23 (mediator complex subunit 23). Is involved in defense response to Gram-positive bacterium\; regulation of protein catabolic process\; and regulation of transcription by RNA polymerase II. Localizes to the mediator complex. Is expressed in several tissues, including the P1.p\; the hyp7 precursor cell\; the reproductive system\; the vulval precursor cell\; and the vulval syncytia precursor.