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Microbial surface displaying formate dehydrogenase and its application in optical detection of formate.

Abstract：

:In the present work, NAD(+)-dependent formate dehydrogenase (FDH), encoded by fdh gene from Candida boidinii was successfully displayed on Escherichia coli cell surface using ice nucleation protein (INP) from Pseudomonas borealis DL7 as an anchoring protein. Localization of matlose binding protein (MBP)-INP-FDH fusion protein on the E. coli cell surface was characterized by SDS-PAGE and enzymatic activity assay. FDH activity was monitored through the oxidation of formate catalyzed by cell-surface-displayed FDH with its cofactor NAD(+), and the production of NADH can be detected spectrometrically at 340nm. After induction for 24h in Luria-Bertani medium containing isopropyl-β-d-thiogalactopyranoside, over 80% of MBP-INP-FDH fusion protein present on the surface of E. coli cells. The cell-surface-displayed FDH showed optimal temperature of 50°C and optimal pH of 9.0. Additionally, the cell-surface-displayed FDH retained its original enzymatic activity after incubation at 4°C for one month with the half-life of 17days at 40°C and 38h at 50°C. The FDH activity could be inhibited to different extents by some transition metal ions and anions. Moreover, the E. coli cells expressing FDH showed different tolerance to solvents. The recombinant whole cell exhibited high formate specificity. Finally, the E. coli cell expressing FDH was used to assay formate with a wide linear range of 5-700μM and a low limit of detection of 2μM. It is anticipated that the genetically engineered cells may have a broad application in biosensors, biofuels and cofactor regeneration system.

journal_name

Enzyme Microb Technol

journal_title

Enzyme and microbial technology

authors

Liu A,Feng R,Liang B

doi

10.1016/j.enzmictec.2016.06.002

subject

Has Abstract

pub_date

2016-09-01 00:00:00

pages

59-65

eissn

0141-0229

issn

1879-0909

pii

S0141-0229(16)30104-1

journal_volume

91

pub_type

杂志文章

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