Unknown

Dataset Information

0

NpdR, a repressor involved in 2,4,6-trinitrophenol degradation in Rhodococcus opacus HL PM-1.


ABSTRACT: Rhodococcus opacus HL PM-1 utilizes 2,4,6-trinitrophenol (picric acid) as a sole nitrogen source. The initial attack on picric acid occurs through two hydrogenation reactions. Hydride transferase II (encoded by npdI) and hydride transferase I (encoded by npdC) are responsible for the hydride transfers. Database searches with the npd genes have indicated the presence of a putative transcriptional regulator, npdR. Here, the npdR gene was expressed in Escherichia coli, and the protein was purified and shown to form a complex with intergenic regions between open reading frames A and B and between npdH and npdI within the npd gene cluster. A change in DNA-NpdR complex formation occurred in the presence of 2,4-dinitrophenol, picric acid, 2-chloro-4,6-dinitrophenol, and 2-methyl-4,6-dinitrophenol. By constructing a promoter-probe vector, we demonstrated that both intergenic regions caused the expression of reporter gene xylE. Hence, both of these regions contain promoters. A deletion mutant of R. opacus HL PM-1 was constructed in which part of npdR was deleted. The expression of npdI and npdC was induced by 2,4-dinitrophenol in the wild-type strain, while in the mutant these genes were constitutively expressed. Hence, NpdR is a repressor involved in picric acid degradation.

SUBMITTER: Nga DP 

PROVIDER: S-EPMC303439 | biostudies-literature | 2004 Jan

REPOSITORIES: biostudies-literature

altmetric image

Publications

NpdR, a repressor involved in 2,4,6-trinitrophenol degradation in Rhodococcus opacus HL PM-1.

Nga Dang P DP   Altenbuchner Josef J   Heiss Gesche S GS  

Journal of bacteriology 20040101 1


Rhodococcus opacus HL PM-1 utilizes 2,4,6-trinitrophenol (picric acid) as a sole nitrogen source. The initial attack on picric acid occurs through two hydrogenation reactions. Hydride transferase II (encoded by npdI) and hydride transferase I (encoded by npdC) are responsible for the hydride transfers. Database searches with the npd genes have indicated the presence of a putative transcriptional regulator, npdR. Here, the npdR gene was expressed in Escherichia coli, and the protein was purified  ...[more]

Similar Datasets

| S-EPMC6080516 | biostudies-literature
| S-EPMC404378 | biostudies-literature
| S-EPMC3516639 | biostudies-literature
| S-EPMC451640 | biostudies-literature
| S-EPMC4988695 | biostudies-literature
| S-EPMC3753941 | biostudies-literature
| S-EPMC135353 | biostudies-literature
| S-EPMC6021439 | biostudies-literature
| S-EPMC7037279 | biostudies-literature
| PRJNA181257 | ENA