Discovery by metagenomics of a functional tandem repeat sequence that controls gene expression in bacteria

Author:

Suenaga Hikaru1ORCID,Matsuzawa Tomohiko2,Sahara Takehiko3

Affiliation:

1. Cellular and Molecular Biotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, 135-0064, Japan

2. Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki-cho, Kagawa, 761-0795, Japan

3. Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8566, Japan

Abstract

Abstract The ability to degrade exogenous compounds is acquired by adaptive processes of microorganisms when they are exposed to compounds that are foreign to their existing enzyme systems. Previously, we reported that simultaneous point mutations and mobile genetic elements cause the evolution and optimization of the degradation systems for aromatic compounds. In the present study, we propose another element with this role—tandem repeats. The novel metagenomic tandem repeat (MTR) sequence T(G/A)ACATG(A/C)T was identified in the 5′-untranslated regions of catechol 2,3-dioxygenase (C23O)-encoding genes by metagenomic analysis. Recombinant Escherichia coli carrying a C23O gene with various numbers of MTRs exhibited increased C23O protein expression and enzyme activity compared with cells expressing the C23O gene without MTRs. Real-time reverse transcription PCR showed that changes in the numbers of MTRs affected the levels of detectable C23O mRNA in the E. coli host. Furthermore, the mRNAs transcribed from C23O genes containing various numbers of MTRs had longer half-lives than those transcribed from a C23O gene without MTRs. Thus, MTRs would affect the translation efficiency of the gene expression system. MTRs may change the expression levels of their downstream genes for adaptation to a fluctuating environment.

Funder

JSPS

Institute for Fermentation, Osaka

Publisher

Oxford University Press (OUP)

Subject

Applied Microbiology and Biotechnology,Ecology,Microbiology

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