Volume 20, Issue 6, Pages (June 2013)

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Volume 20, Issue 6, Pages 796-805 (June 2013) Unconventional Origin and Hybrid System for Construction of Pyrrolopyrrole Moiety in Kosinostatin Biosynthesis Hong-Min Ma, Qiang Zhou, Yu-Min Tang, Zhuan Zhang, Yong-Sheng Chen, Hai-Yan He, Hai-Xue Pan, Man-Cheng Tang, Ju-Fang Gao, Sheng-Yin Zhao, Yasuhiro Igarashi, Gong-Li Tang Chemistry & Biology Volume 20, Issue 6, Pages 796-805 (June 2013) DOI: 10.1016/j.chembiol.2013.04.013 Copyright © 2013 Elsevier Ltd Terms and Conditions

Chemistry & Biology 2013 20, 796-805DOI: (10. 1016/j. chembiol. 2013 Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 1 Proposed Biosynthetic Pathway of KST (A) Localization of the cloned DNA region from Micromonospora sp. TP-A0468 as represented by two overlapping fosmids and organization of KST gene cluster. (B–E) Proposed model for type II PKS and PKS-associated modification (B), NRPS and formation of the bicyclic amidine (C), glycosylation relative modification (D), and deoxysugar pathway (E). Color coding indicates the genes for the anthracycline (blue), aminopyrrole (red), bicycled amidine (green), deoxy sugar (purple), and all other genes (black). See also Tables S1–S3 and Figures S3, S4, and S9. Chemistry & Biology 2013 20, 796-805DOI: (10.1016/j.chembiol.2013.04.013) Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 2 Characterization the Genes Involved in the Biosynthesis of KST In Vivo (A) HPLC analysis of KST production at 423 nm: (I) KST standard, (II) wild-type Micromonospora sp. TP-A0468, (III) mutant TG1701 (ΔkstA6), (IV) TG1708 (ΔkstB1), (V) TG1709 (ΔkstC3), and (VI) TG1710 (ΔkstA12). (B) Structure elucidation of 3 from TG1708 (ΔkstB1) or TG1709 (ΔkstC3) and 5 isolated from mutant TG1710 (ΔkstA12). See also Tables S5 and S6 and Figures S1, S2, S7, S10, and S11. Chemistry & Biology 2013 20, 796-805DOI: (10.1016/j.chembiol.2013.04.013) Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 3 Biosynthetic Precursors of KST Characterized by Feeding Experiments (A) Summary of biosynthetic precursors of 2 with 13C-labeled sodium acetate and ribose. (B) 13C-NMR spectra with (I) and without (II) feeding of D-[2-13C]-ribofuranose. The enhanced signal at δ 22.3 (C-4′) is marked. See also Table S4 and Figure S5. Chemistry & Biology 2013 20, 796-805DOI: (10.1016/j.chembiol.2013.04.013) Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 4 In Vitro Aminoacylation of KstB2 by KstB1 (A) Enzymatic reaction. (B) HPLC analysis (UV220 nm) of KstB1 (I), KstB2 (II), and aminoacylation of KstB2 by KstB1 using nicotinic acid as substrate for 5 min (III). (C) Q-TOF-MS analysis of holo-KstB2 (I) and nicotinyl-S-KstB2 (II). The m/z on the x axis refer to the mass to charge ratio, the charge of the protein is +15. (○) holo-KstB2; (⋄) apo-KstB2; (▿) KstB1; (●) nicotinyl-S-KstB2. All these PCP species were confirmed by LC-MS analysis. See also Figures S6 and S8. Chemistry & Biology 2013 20, 796-805DOI: (10.1016/j.chembiol.2013.04.013) Copyright © 2013 Elsevier Ltd Terms and Conditions