The function of QSOX1 (quiescin sulfhydryl oxidase 1, ENSG00000116260) is as follows. Catalyzes the oxidation of sulfhydryl groups in peptide and protein thiols to disulfides with the reduction of oxygen to hydrogen peroxide (PubMed:17331072, PubMed:18393449, PubMed:23704371, PubMed:23867277, PubMed:30367560). Plays a role in disulfide bond formation in a variety of extracellular proteins (PubMed:17331072, PubMed:22801504, PubMed:23867277, PubMed:30367560). In fibroblasts, required for normal incorporation of laminin into the extracellular matrix, and thereby for normal cell-cell adhesion and cell migration (PubMed:23704371, PubMed:23867277, PubMed:30367560). {ECO:0000269|PubMed:17331072, ECO:0000269|PubMed:18393449, ECO:0000269|PubMed:22801504, ECO:0000269|PubMed:23704371, ECO:0000269|PubMed:23867277, ECO:0000269|PubMed:30367560}.