A novel strategy for l-arginine production in engineered Escherichia coli

Author:

Nie Mengzhen,Wang Jingyu,Zhang Kechun

Abstract

AbstractBackgroundl-arginine is an important amino acid with applications in diverse industrial and pharmaceutical fields.n-acetylglutamate, synthesized froml-glutamate and acetyl-CoA, is a precursor of thel-arginine biosynthetic branch in microorganisms. The enzyme that producesn-acetylglutamate,n-acetylglutamate synthase, is allosterically inhibited byl-arginine.l-glutamate, as a central metabolite, provides carbon backbone for diverse biological compounds besidesl-arginine. When glucose is the sole carbon source, the theoretical maximum carbon yield towardsl-arginine is 96.7%, but the experimental highest yield was 51%. The gap ofl-arginine yield indicates the regulation complexity of carbon flux and energy during thel-arginine biosynthesis. Besides endogenous biosynthesis,n-acetylglutamate, the key precursor ofl-arginine, can be obtained by chemical acylation ofl-glutamate with a high yield of 98%. To achieve high-yield production ofl-arginine, we demonstrated a novel approach by directly feeding precursorn-acetylglutamate to engineeredEscherichia coli.ResultsWe reported a new approach for the high yield ofl-arginine production inE. coli.GeneargAencodingn-acetylglutamate synthase was deleted to disable endogenous biosynthesis ofn-acetylglutamate. The feasibility of externaln-acetylglutamate towardsl-arginine was verified via growth assay inargAstrain. To improvel-arginine production,astAencoding argininen-succinyltransferase,speFencoding ornithine decarboxylase,speBencoding agmatinase, andargRencoding an arginine responsive repressor protein were disrupted. Based on overexpression ofargDGI, argCBHoperons,encoding enzymes of thel-arginine biosynthetic pathway, ~ 4 g/Ll-arginine was produced in shake flask fermentation, resulting in a yield of 0.99 moll-arginine/moln-acetylglutamate. This strain was further engineered for the co-production ofl-arginine and pyruvate by removing genesadhE, ldhA, poxB, pflB,andaceE,encoding enzymes involved in the conversion and degradation of pyruvate.The resulting strain was shown to produce 4 g/Ll-arginine and 11.3 g/L pyruvate in shake flask fermentation.ConclusionsHere, we developed a novel approach to avoid the strict regulation ofl-arginine on ArgA and overcome the metabolism complexity in thel-arginine biosynthesis pathway. We achieve a high yield ofl-arginine production fromn-acetylglutamate inE. coli. Co-production pyruvate andl-arginine was used as an example to increase the utilization of input carbon sources.

Funder

National Natural Science Foundation of China

Publisher

Springer Science and Business Media LLC

Subject

Applied Microbiology and Biotechnology,Bioengineering,Biotechnology

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