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Identification of a novel promoter gHp0169 for gene expression in Gluconobacter oxydans.

Abstract：

:Gluconobacter oxydans can perform rapid incomplete oxidation of many sugars, sugar polyols and alcohols, and this outstanding ability shows a great potential in industrial bioconversion. Improvements of these industrially important strains would boost their productivities of important metabolites. However, the shortage of molecular tools for homologous and heterologous gene expression has obviously hindered G. oxydans from further application. In this study, a putative promoter sequence (104bp), designated as gHp0169, was isolated and characterized from the chromosome of G. oxydans DSM 2003. Within this promoter sequence, the typical motif, known as -35 and -10 sequences with a 19-bp spacing, was found. The availability and promoter strength of promoter gHp0169 were then evaluated, by insertion into the plasmid pBBR1MCS5 for expression of a green fluorescent protein (GFP) and a membrane-bound type II NADH dehydrogenase (NDH-2) of G. oxydans. In comparison with promoter G. oxydans_tufB, gHp0169 exhibited a stronger promoter activity of NDH-2, indicating its significant value of gene expression in G. oxydans. To promote the production of 2-keto-d-gluconic acid (2-KGA) from gluconic acid (GA) gHp0169 was attempted to equip the flavin-dependent gluconate-2-dehydrogenase (GA2DH) and successfully achieved its overexpression in G. oxydans DSM 2003. As a result, the space-time yield of 2-KGA was boosted up to 29.86mM/h compared with 14.78mM/h for the control, which corresponded to a yield of 98.3% (84% for control).

journal_name

J Biotechnol

journal_title

Journal of biotechnology

authors

Shi L,Li K,Zhang H,Liu X,Lin J,Wei D

doi

10.1016/j.jbiotec.2014.01.035

subject

Has Abstract

pub_date

2014-04-10 00:00:00

pages

69-74

eissn

0168-1656

issn

1873-4863

pii

S0168-1656(14)00068-6

journal_volume

175

pub_type

杂志文章

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