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Biosci Biotechnol Biochem. 2014;78(2):350-7. doi: 10.1080/09168451.2014.878222. Epub 2014 Apr 14.

Production of P-aminobenzoic acid by metabolically engineered escherichia coli.

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1
a Osaka Municipal Technical Research Institute , Osaka , Japan.

Abstract

The production of chemical compounds from renewable resources is an important issue in building a sustainable society. In this study, Escherichia coli was metabolically engineered by introducing T7lac promoter-controlled aroF(fbr), pabA, pabB, and pabC genes into the chromosome to overproduce para-aminobenzoic acid (PABA) from glucose. Elevating the copy number of chromosomal PT7lac-pabA-pabB distinctly increased the PABA titer, indicating that elevation of 4-amino-4-deoxychorismic acid synthesis is a significant factor in PABA production. The introduction of a counterpart derived from Corynebacterium efficiens, pabAB (ce), encoding a fused PabA and PabB protein, resulted in a considerable increase in the PABA titer. The introduction of more than two copies of PT7lac-pabAB (ce-mod), a codon-optimized pabAB (ce), into the chromosome of a strain that simultaneously overexpressed aroF(fbr) and pabC resulted in 5.1 mM PABA from 55.6 mM glucose (yield 9.2%). The generated strain produced 35 mM (4.8 g‚ÄČL(-1)) PABA from 167 mM glucose (yield 21.0%) in fed-batch culture.

KEYWORDS:

Escherichia coli; aromatic compound; metabolic engineering; para-aminobenzoic acid

PMID:
25036692
DOI:
10.1080/09168451.2014.878222
[Indexed for MEDLINE]
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