Model pathways for formation of the shunt products K1115 A, DHPA, and ThA in S. albus/pAoriΔalnH and S. albus/pAoriΔalnT (A), biosynthesis of prealnumycin in Streptomyces sp. CM020 (B), and pathway towards formation of the model antibiotic actinorhodin in S. coelicolor (36) (C). Abbreviations: DDHK, 6-deoxydihydrokalafungin; DHK, dihydrokalafungin.