Fig. 4.

Oosporein biosynthetic machinery. The domains of OpS1 include: KS, β-ketoacyl synthase; AT, acyltransferase; DH, dehydrogenase; ACP, acyl carrier protein; TE, thioesterase. Compound 1, oosporein; 2, OA; 3, 6-methyl-1,2,4-benzenetriol; 4, 2-hydroxy-6-methyl-2,5-cyclohexadiene-1,4-dione; 5, 5,5′-dideoxy-oosporein; 6, 2,5-dihydroxy-3-methyl-2,5-cyclohexadiene-1,4-dione; 7, 6-methyl-1,2,4,5-benzenetetrol; 8, free radical form of 7. The question mark after OpS2 means the function of this putative MFS transporter remains unclear. GSH, glutathione.