Screening of a novel strong promoter by RNA sequencing and its application to H2 production in a hyperthermophilic archaeon.

Abstract:

:A strong promoter increases transcription of the genes of interest and enhances the production of various valuable substances. For a hyperthermophilic archaeon Thermococcus onnurineus NA1, which can produce H2 from carbon monoxide oxidation, we searched for a novel endogenous strong promoter by transcriptome analysis using high-throughput RNA sequencing. Based on the relative transcript abundance, we selected one promoter to encode a hypothetical gene, of which homologs were found only in several Thermococcales strains. This promoter, P TN0510 , was introduced into the front of CO-responsible hydrogenase gene cluster encoding a carbon monoxide dehydrogenase (CODH), a hydrogenase, and a Na(+)/H(+) antiporter. In the resulting mutant strain, KS0510, transcription and translation level of the gene cluster increased by 4- to 14-folds and 1.5- to 1.9-folds, respectively, in comparison with those of the wild-type strain. Additionally, H2 production rate of KS0510 mutant was 4.8-fold higher than that of the wild-type strain. The P TN0510 was identified to be much stronger than the well-known two strong promoters, gdh and slp promoters from Thermococcus strains, through RT-qPCR and Western blotting analyses and kinetics of H2 production. In this study, we demonstrated that the RNA-seq approach is a good strategy to mine novel strong promoters of use to a Thermococcus strain when developed as a biotechnologically promising strain to produce valuable products such as enzymes and metabolites through metabolic engineering.

authors

Lee SH,Kim MS,Jung HC,Lee J,Lee JH,Lee HS,Kang SG

doi

10.1007/s00253-015-6444-1

subject

Has Abstract

pub_date

2015-05-01 00:00:00

pages

4085-92

issue

9

eissn

0175-7598

issn

1432-0614

journal_volume

99

pub_type

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