title: Transcriptomics-based strain optimization tool for designing secondary metabolite overproducing strains of Streptomyces coelicolor.
abstract: In silico model-driven analysis using genome-scale model of metabolism (GEM) has been recognized as a promising method for microbial strain improvement. However, most of the current GEM-based strain design algorithms based on flux balance analysis (FBA) heavily rely on the steady-state and optimality assumptions without considering any regulatory information. Thus, their practical usage is quite limited, especially in its application to secondary metabolites overproduction. In this study, we developed a transcriptomics-based strain optimization tool (tSOT) in order to overcome such limitations by integrating transcriptomic data into GEM. Initially, we evaluated existing algorithms for integrating transcriptomic data into GEM using Streptomyces coelicolor dataset, and identified iMAT algorithm as the only and the best algorithm for characterizing the secondary metabolism of S. coelicolor. Subsequently, we developed tSOT platform where iMAT is adopted to predict the reaction states, and successfully demonstrated its applicability to secondary metabolites overproduction by designing actinorhodin (ACT), a polyketide antibiotic, overproducing strain of S. coelicolor. Mutants overexpressing tSOT targets such as ribulose 5-phosphate 3-epimerase and NADP-dependent malic enzyme showed 2 and 1.8-fold increase in ACT production, thereby validating the tSOT prediction. It is expected that tSOT can be used for solving other metabolic engineering problems which could not be addressed by current strain design algorithms, especially for the secondary metabolite overproductions.
authors.affiliation: School of Chemical and Biological Engineering, Institute of Molecular Biology and Genetics, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea.|Bioengineering Institute, Seoul National University, Seoul, Republic of Korea.
authors.forename: Minsuk
authors.initials: M
authors.lastname: Kim
authors.affiliation: School of Chemical and Biological Engineering, Institute of Molecular Biology and Genetics, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea.|Bioengineering Institute, Seoul National University, Seoul, Republic of Korea.
authors.forename: Jeong Sang
authors.initials: JS
authors.lastname: Yi
authors.affiliation: Bioprocessing Technology Institute, A*STAR (Agency for Science, Technology and Research), Centros, Singapore.
authors.forename: Meiyappan
authors.initials: M
authors.lastname: Lakshmanan
authors.affiliation: Bioprocessing Technology Institute, A*STAR (Agency for Science, Technology and Research), Centros, Singapore. cheld@nus.edu.sg.|Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore. cheld@nus.edu.sg.|NUS Synthetic Biology for Clinical and Technological Innovation (SynCTI), Life Sciences Institute, National University of Singapore, Singapore. cheld@nus.edu.sg.
authors.forename: Dong-Yup
authors.initials: DY
authors.lastname: Lee
authors.affiliation: School of Chemical and Biological Engineering, Institute of Molecular Biology and Genetics, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea. byungkim@snu.ac.kr.|Bioengineering Institute, Seoul National University, Seoul, Republic of Korea. byungkim@snu.ac.kr.|Interdisciplinary Program for Biochemical Engineering and Biotechnology, Seoul National University, Seoul, Republic of Korea. byungkim@snu.ac.kr.
authors.forename: Byung-Gee
authors.initials: BG
authors.lastname: Kim
mesh_terms: D000880:Anthraquinones / Q000378:metabolism; D000900:Anti-Bacterial Agents / Q000378:metabolism; D019295:Computational Biology; D020869:Gene Expression Profiling; D060847:Metabolic Engineering / Q000379:methods*; D053858:Metabolic Networks and Pathways / Q000235:genetics; D008954:Models, Biological; D064210:Secondary Metabolism; D048372:Streptomyces coelicolor / Q000235:genetics* / Q000378:metabolism*; D000095622:Benzoisochromanequinones
chemical_list: D000880:Anthraquinones; D000900:Anti-Bacterial Agents; C013390:actinorhodin; D000095622:Benzoisochromanequinones
keywords: Streptomyces coelicolor; antibiotics; genome-scale model of metabolism; metabolic engineering; strain design; transcriptomics