DipR, a GntR/FadR-family transcriptional repressor: regulatory mechanism and widespread distribution of the dip cluster for dipicolinic acid catabolism in bacteria.

Dipicolinic acid is an essential component of bacterial spores for stress resistance, which is released into the environment after spore germination. In a previous study, a dip gene cluster was found to be responsible for the catabolism of dipicolinic acid in Alcaligenes faecalis JQ135. However, the transcriptional regulatory mechanism remains unclear.

Characterization of cotinine degradation in a newly isolated Gram-negative strain Pseudomonas sp. JH-2.

Cotinine, the primary metabolite of nicotine in the human body, is an emerging pollutant in aquatic environments. It causes environmental problems and is harmful to the health of humans and other mammals; however, the mechanisms of its biodegradation have been elucidated incompletely. In this study, a novel Gram-negative strain that could degrade and utilize cotinine as a sole carbon source was isolated from municipal wastewater samples, and its cotinine degradation characteristics and kinetics were determined.

Isolation and Characterization of the Wastewater Micropollutant Phenacetin-Degrading Bacterium sp. Strain PNT-23.

Phenacetin, an antipyretic and analgesic drug, poses a serious health risk to both humans and aquatic organisms, which is of concern since this micropollutant is frequently detected in various aquatic environments. However, rare pure bacterial cultures have been reported to degrade phenacetin. Therefore, in this study, the novel phenacetin-degrading strain PNT-23 was isolated from municipal wastewater and identified as a sp.

Isolation and characterization of the 2,5-pyridinedicarboxylic acid-degrading bacterium Agrobacterium sp. strain YJ-5.

2,5-Pyridinedicarboxylic acid (2,5-PDA), a natural N-heterocyclic compound and a substitute for production in plastics, was widely distributed in industrial wastewater. However, the biodegradation of 2,5-PDA has been rarely reported. In this study, strain YJ-5, which could utilize 2,5-PDA as the sole carbon source for growth was isolated from pesticide-contaminated soil.

The MocR family transcriptional regulator DnfR has multiple binding sites and regulates Dirammox gene transcription in Alcaligenes faecalis JQ135.

Microbial ammonia oxidation is vital to the nitrogen cycle. A biological process, called Dirammox (direct ammonia oxidation, NH →NH OH→N ), has been recently identified in Alcaligenes ammonioxydans and Alcaligenes faecalis. However, its transcriptional regulatory mechanism has not yet been fully elucidated.

PicR as a MarR Family Transcriptional Repressor Multiply Controls the Transcription of Picolinic Acid Degradation Gene Cluster in Alcaligenes faecalis JQ135.

Picolinic acid (PA) is a natural toxic pyridine derivative as well as an important intermediate used in the chemical industry. In a previous study, we identified a gene cluster, , that responsible for the catabolism of PA in Alcaligenes faecalis JQ135. However, the transcriptional regulation of the cluster remains known.

Biodegradation of Quinoline by a Newly Isolated Salt-Tolerating Bacterium Strain JH145.

Quinoline is a typical nitrogen-heterocyclic compound with high toxicity and carcinogenicity which exists ubiquitously in industrial wastewater. In this study, a new quinoline-degrading bacterial strain sp. JH145 was isolated from oil-contaminated soil.

Biodegradation of quinolinic acid by a newly isolated bacterium Alcaligenes faecalis strain JQ191.

Quinolinic acid (QA) is a pyridine derivative that can be found in many organisms and is widely used in the chemical industry. However, QA possesses excitotoxic properties. To date, the catabolism of QA mediated by microorganisms has rarely been reported.

The TetR Family Repressor HpaR Negatively Regulates the Catabolism of 5-Hydroxypicolinic Acid in Alcaligenes faecalis JQ135 by Binding to Two Unique DNA Sequences in the Promoter of Operon.

5-Hydroxypicolinic acid (5HPA), an important natural pyridine derivative, is microbially degraded in the environment. Previously, a gene cluster, , responsible for 5HPA degradation, was identified in Alcaligenes faecalis JQ135. However, the transcription regulation mechanism of the cluster is still unknown.

Pseudaminobacter soli sp. nov., Isolated from Paddy Soil Contaminated with Heavy Metals.

A Gram stain-negative, aerobic, rod-shaped strain, designated HC19, was isolated from heavy metals contaminated paddy soil. The 16S rRNA gene-based phylogenetic analysis indicated that strain HC19 belonged to the genus Pseudaminobacter, and shared 97.0% 16S rRNA gene sequence similarity with P.

Characterization of a new heterotrophic nitrification bacterium Pseudomonas sp. strain JQ170 and functional identification of nap gene in nitrite production.

Heterotrophic nitrification bacteria play a critical role in nitrogen cycling and pollution removal. However, the underlying nitrification mechanisms are diverse and have rarely been investigated at the genetic level. In this study, the new heterotrophic nitrifier Pseudomonas sp.