Non-reducing polyketide synthase; part of the SOR gene cluster that mediates the biosynthesis of sorbicillinoids, a diverse group of yellow secondary metabolites that restrict growth of competing pathogenic fungi but not of bacteria (PubMed:29104566). Sorbicillinoids biosynthesis requires the action of two PKSs (PubMed:28809958). The SOR cluster is required for the production of trichodimerol and dihydrotrichotetronin, with sor2 being sufficient for production of trichodimerol, but not dihydrotrichotetronin in the light (PubMed:28809958). Sor1 iteratively combines three acetyl units and the growing chain is modified by the ketoacyl reductase subunit, and optional by the enoyl reductase subunit in the second cycle (By similarity). The polyketide is then handed over to the PKS sor2, which adds three more acetyl units, and two methyl groups (By similarity). Sor2 releases an aldehyde, which undergoes spontaneous cyclization resulting in the formation of sorbicillin or 2',3'-dihydrosorbicillin (By similarity). The monooxygenase sor5 oxidizes sorbicillin and 2',3'-dihydrosorbicillin to 2',3'-dihydrosorbicillinol and sorbicillinol, respectively (PubMed:29104566). The oxidoreductase sor8 further converts sorbicillinol into oxosorbicillinol (PubMed:29104566). Sorbicillinol is the building block for the other sorbicillinoids such as disorbicillinol, bisvertinolon, dihydrobisvertinolone, and dihydrotrichotetronine (PubMed:29104566, PubMed:28809958). Binds 1 phosphopantetheine covalently. Secondary metabolite biosynthesis. The promoter contains putative CRE1 binding motifs 5'-SYGGRG-3' and expression is differentially regulated in light and darkness by CRE1 (PubMed:28809958). Photoreceptors BLR1 and BLR2 negatively regulate the expression, while ENV1 exerts positive regulation (PubMed:28809958). Moreover the SOR biosynthetic genes show a mechanism of positive feedback on each other in darkness (PubMed:28809958). Multidomain protein; including an N-terminal starter unit:ACP transacylase (SAT) domain, a beta-ketoacyl synthase (KS) domain, a malonyl-CoA:ACP transacylase (MAT) domain, a product template domain, a acyl carrier protein (ACP) domain, a methyltransferase domain and a reductive NADPH-binding domain that is required for NADPH-dependent product release. Abolishes production of trichodimerol and dihydrotrichotetronin in darkness (PubMed:28809958). Also impacts production of paracelsin in a light dependent manner, with decreased paracelsin levels in light, but likely in an indirect way (PubMed:28809958). Results also in a positive trend for cbh1 transcript levels and increased specific cellulase activity (PubMed:28809958).