Predicted to enable misfolded protein binding activity; oxidoreductase activity, acting on a sulfur group of donors, disulfide as acceptor; and protein-disulfide reductase activity. Involved in IRE1-mediated unfolded protein response. Located in endoplasmic reticulum lumen. Expressed in several structures, including body wall musculature; gonadal sheath cell; intestine; rectum; and vulva. Is an ortholog of human DNAJC10 (DnaJ heat shock protein family (Hsp40) member C10).