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Development of highly-sensitive microbial biosensors by mutation of the nahR regulatory gene

Paper ID Volume ID Publish Year Pages File Format Full-Text
24009 43489 2010 5 PDF Available
Title
Development of highly-sensitive microbial biosensors by mutation of the nahR regulatory gene
Abstract

NahR, a transcriptional regulator for naphthalene degradation in response to salicylate, is a central element in the microbial biosensor for detection of naphthalene and salicylate. To maximize the sensitivity of the biosensor, we have chosen a rational design of highly-sensitive microbial biosensors by introducing site directed mutagenesis to nahR gene. Eight single mutants (N169A, N169C, N169K, N169S, R248H, R248M, R248Q, and R248Y) were made at residues 169 and 248 known as the central inducer-recognition and the C-terminal multimerization domain. The effects of these mutations were examined by monitoring expression of a firefly luciferase (luc) reporter gene under the control of NahR. We found that all mutants at residues 248 and N169C show increased sensitivity (maximum ∼50-fold) compared to wild type, respectively. R248M shows response even at toxic concentration, 5 mM. The results show the feasibility and potential versatility of mutational approach for the development of the highly-sensitive microbial biosensors.

Keywords
NahR; Mutagenesis; Highly-sensitive biosensors; Bioluminescence
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Development of highly-sensitive microbial biosensors by mutation of the nahR regulatory gene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 150, Issue 2, 15 October 2010, Pages 246–250
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us