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Coordinated Two-Stage Dynamic Deregulation of Central Metabolism Improves Malonyl-CoA Biosynthesis

Ph.D. Defense, Brigham-Stinson, Natasha
Thursday, March 23, 2023
9:00 am - 10:00 am

Jeovanna Rios, Ph.D. Candidate

Michael Lynch, Ph.D., Advisor

Abstract: Malonyl-CoA (malonyl-CoA) is a platform chemical that serves as a precursor for a wide range of commercial products and pharmaceutical intermediates. In E. coli, malonyl-CoA levels are tightly regulated to remain at low levels. Two Stage Dynamic Metabolic Control (DMC) is a tool previously demonstrated to improve desired metabolite flux for several products. This work leverages DMC to improve malonyl-CoA fluxes. Specifically, I demonstrate coordinated dynamic reductions in the activities of fabI (enoyl-ACP reductase), gltA (citrate synthase), zwf (glucose-6-phosphate dehydrogenase) and glnB (nitrogen regulatory protein PII-1), during stationary phase lead to synergistic improvements in malonyl-CoA flux and the production of malonyl-CoA dependent products, 1,3,6,8-tetrahydroxynaphthalene (THN), Triacetic Lactone (TAL), and Phloroglucinol (PG). I also discuss the unique set of limitations that were observed for both TAL and PG biosynthesis as well as the strategies that were tested to overcome them.