Cancer causes 1 of every 4 deaths in the US. The development of fundamentally new, clinically useful anticancer drugs therefore constitutes a national health and research imperative. Leinamycin (LNM), iso-migrastatin (iso-MGS), migrastatin (MGS), and lactimidomycin (LTM) are promising anticancer drug leads with unprecedented modes of action. A great challenge is to develop ways to prepare these complex natural products and their structural analogs for mechanistic studies and clinical development. We propose in this Competitive Renewal application (i) to continue to study LNM, iso-MGS, and LTM biosynthesis to discover novel chemistry and enzymology and (ii) to apply combinatorial biosynthesis methods to the LNM, iso-MGS, and LTM biosynthetic machinery for production of novel anticancer drugs. Our hypotheses are (i) the LNM, iso-MGS, and LTM AT-less type I PKSs represent a novel PKS architecture, the studies of which will reveal new insights into the molecular mechanism of PKS catalysis, (ii) AT-less type I PKSs provide new opportunities for PKS engineering, methods and strategies for expanding polyketide structural diversity by combinatorial biosynthesis, (iii) several other aspects in LNM, iso-MGS, and LTM biosynthesis are unprecedented, the characterization of which will uncover new chemistry and enzymology, and (iv) LNM, iso-MGS, MGS, and LTM are excellent anticancer leads with novel modes of action, and these natural products and their structural analogs could be realistically developed into new anticancer drugs.
The specific aims for this grant period are: (i) mechanistic and structural characterization of the LNM, iso-MGS, and LTM AT-less type I PKSs as models to investigate how AT-less type I PKS interacts with its cognate acyltransferase (AT) to constitute a functional PKS megasynthase for polyketide biosynthesis;(ii) mechanistic and structural characterization of novel enzymes for LNM, iso-MGS, and LTM biosynthesis;and (iii) rational engineering of the LNM, iso-MGS, and LTM pathways for metabolite overproduction and novel analogs. The outcomes of these studies include the discovery and development of novel anticancer drug leads and potentially clinically useful anticancer drugs. The long-term goal of our research is to understand at a molecular level how microorganisms synthesize complex natural products and to develop and apply combinatorial biosynthesis methods to natural products for anticancer drug discovery and development.
Cancer causes 1 of every 4 deaths in the US. 562,340 Americans are expected to die of cancer in 2009, and the overall cost of cancer in 2008 was estimated at $228.1 billion. It is therefore a critical research goal to develop fundamentally new, clinically useful anticancer drugs. Leinamycin, iso-migrastatin, migrastatin, and lactimidomycin are promising anticancer drug leads with unprecedented modes of action. A great challenge is to develop methods to make these complex natural products and generate their structural analogs for mechanistic studies and clinical developments. This research will study the leinamycin, iso-migrastatin, and lactimidomycin biosynthetic machineries and engineered and produce novel analogs. The outcomes include the discovery and development of novel anticancer drug leads and potentially clinically useful anticancer drugs.
|Huang, Yong; Yang, Dong; Pan, Guohui et al. (2016) Characterization of LnmO as a pathway-specific Crp/Fnr-type positive regulator for leinamycin biosynthesis in Streptomyces atroolivaceus and its application for titer improvement. Appl Microbiol Biotechnol 100:10555-10562|
|Huang, Yong; Tang, Gong-Li; Pan, Guohui et al. (2016) Characterization of the Ketosynthase and Acyl Carrier Protein Domains at the LnmI Nonribosomal Peptide Synthetase-Polyketide Synthase Interface for Leinamycin Biosynthesis. Org Lett 18:4288-91|
|Zhang, Bo; Yang, Dong; Yan, Yijun et al. (2016) Overproduction of lactimidomycin by cross-overexpression of genes encoding Streptomyces antibiotic regulatory proteins. Appl Microbiol Biotechnol 100:2267-77|
|Liu, Tao; Ma, Ming; Ge, Hui-Ming et al. (2015) Synthesis and evaluation of 8,4'-dideshydroxy-leinamycin revealing new insights into the structure-activity relationship of the anticancer natural product leinamycin. Bioorg Med Chem Lett 25:4899-902|
|Gao, Xiangwei; Wan, Ji; Liu, Botao et al. (2015) Quantitative profiling of initiating ribosomes in vivo. Nat Methods 12:147-53|
|Lohman, Jeremy R; Ma, Ming; Osipiuk, Jerzy et al. (2015) Structural and evolutionary relationships of ""AT-less"" type I polyketide synthase ketosynthases. Proc Natl Acad Sci U S A 112:12693-8|
|Yang, Zhilong; Cao, Shuai; Martens, Craig A et al. (2015) Deciphering poxvirus gene expression by RNA sequencing and ribosome profiling. J Virol 89:6874-86|
|Ma, Ming; Lohman, Jeremy R; Liu, Tao et al. (2015) C-S bond cleavage by a polyketide synthase domain. Proc Natl Acad Sci U S A 112:10359-64|
|Huang, Sheng-Xiong; Yun, Bong-Sik; Ma, Ming et al. (2015) Leinamycin E1 acting as an anticancer prodrug activated by reactive oxygen species. Proc Natl Acad Sci U S A 112:8278-83|
|Seo, Jeong-Woo; Ma, Ming; Kwong, Thomas et al. (2014) Comparative characterization of the lactimidomycin and iso-migrastatin biosynthetic machineries revealing unusual features for acyltransferase-less type I polyketide synthases and providing an opportunity to engineer new analogues. Biochemistry 53:7854-65|
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