Promoter recognition and beta-galactosidase reporter gene expression in Rhodococcus.
- Author:
Changchun LIU
1
;
Huimin YU
;
M YUCHAO
;
Wenyu PAN
;
Hui LUO
;
Zhongyao SHEN
Author Information
1. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
- Publication Type:Journal Article
- MeSH:
Escherichia coli;
genetics;
Gene Expression Regulation, Bacterial;
Genes, Reporter;
genetics;
Lac Operon;
genetics;
Promoter Regions, Genetic;
genetics;
Rhodococcus;
enzymology;
genetics;
beta-Galactosidase;
genetics
- From:
Chinese Journal of Biotechnology
2009;25(9):1360-1365
- CountryChina
- Language:Chinese
-
Abstract:
The genus Rhodococcus is of considerable interest in recent years, stemming from their diverse applications in biodegradation, bioremediation, biotransformation and biosurfactant. Using Nocardia/Rhodococcus-Escherichia coli shuttle plasmid pNV18.1 as the backbone vector, we tested the driven efficiency of promoters Ptac and PlacZ of E. coli and Pami-1/Pami-2 of R. ruber in host R. rhodochrous ATCC 33278 by overexpression of nitrile hydratase. Results showed that the specific activity of nitrile hydratase per dry cell weight in engineered Rhodococcus strains driven by Ptac, Pami-1, Pami-2 and PlacZ was 7.5, 6.3, 5.3 and 1.8 times of that in the wild, respectively. It indicated that these promoters could be well recognized by RNA polymerase of Rhodococcus. We further expressed the beta-galactosidase reporter gene (lacZ) in R. ruber driven by promoter PlacZ. Results indicated that lacZ was an appropriate reporter gene for genetic or metabolic engineering research of Rhodococcus.
