Protein disulfide isomerase (By similarity). Promotes the localization of acetylcholine receptors (AChRs) to the plasma membrane (By similarity). {ECO:0000250|UniProtKB:Q91XD7, ECO:0000250|UniProtKB:Q9CYA0}. This is the function of Ensembl gene identifier ENSG00000163703 (CRELD1, CRELD disulfide isomerase 1).