| 초록 |
Polyhydroxyalkanote (PHA) is a potential substitute for petroleum-based plastics and can be produced by many microorganisms. Escherichia coli is an ideal host for PHB production owing to the simplicity of extraction, the absence of an intracellular depolymerization, and the ability to utilize several inexpensive carbon sources. For efficient conversion of substrates and maximum PHA production, we performed multiple engineering of branched pathways in E. coli. We deleted genes, which contributed to the formation of byproducts, using the CRISPR-Cas9 system and overexpressed transhydrogenase, which catalyzes the interconversion of NADH and NADPH. The constructed strain showed accumulation of acetyl-CoA and decreased levels of byproducts, resulting in dramatic increases in cell growth and PHA content. Thus, we demonstrated the effects of multiple engineering for redirecting carbon flux into PHA production without any concerns regarding simultaneous deletion. |
