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Functional expression of prokaryotic and eukaryotic genes in Escherichia coli for conversion of glucose to p-hydroxystyrene.

Abstract：

:The chemical monomer p-hydroxystyrene (pHS) is used for producing a number of important industrial polymers from petroleum-based feedstocks. In an alternative approach, the microbial production of pHS can be envisioned by linking together a number of different metabolic pathways, of which those based on using glucose for carbon and energy are currently the most economical. The biological process conserves petroleum when glucose is converted to the aromatic amino acid L-tyrosine, which is deaminated by a tyrosine/phenylalanine ammonia-lyase (PAL/TAL) enzyme to yield p-hydroxycinnamic acid (pHCA). Subsequent decarboxylation of pHCA gives rise to pHS. Bacteria able to efficiently decarboxylate pHCA to pHS using a pHCA decarboxylase (PDC) include Bacillus subtilis, Pseudomonas fluorescens and Lactobacillus plantarum. Both B. subtilis and L. plantarum possess high levels of pHCA-inducible decarboxylase activity and were chosen for further studies. The genes encoding PDC in these organisms were cloned and the pHCA decarboxylase expressed in Escherichia coli strains co-transformed with a plasmid encoding a bifunctional PAL/TAL enzyme from the yeast Rhodotorula glutinis. Production of pHS from glucose was ten-fold greater for the expressed L. plantarum pdc gene (0.11mM), compared to that obtained when the B. subtilis PDC gene (padC) was used. An E. coli strain (WWQ51.1) expressing both tyrosine ammonia-lyase(PAL) and pHCA decarboxylase (pdc), when grown in a 14L fermentor and under phosphate limited conditions, produced 0.4g/L of pHS from glucose. We, therefore, demonstrate pHS production from an inexpensive carbohydrate feedstock by fermentation using a novel metabolic pathway comprising genes from E. coli, L. plantarum and R. glutinis.

journal_name

Metab Eng

journal_title

Metabolic engineering

authors

Qi WW,Vannelli T,Breinig S,Ben-Bassat A,Gatenby AA,Haynie SL,Sariaslani FS

doi

10.1016/j.ymben.2007.01.002

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

268-76

issue

eissn

1096-7176

issn

1096-7184

pii

S1096-7176(07)00002-X

journal_volume

pub_type

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Functional expression of prokaryotic and eukaryotic genes in Escherichia coli for conversion of glucose to p-hydroxystyrene.