Related Experiment Video
Updated: May 13, 2026
10:03
Isolation, Propagation, and Identification of Bacterial Species with Hydrocarbon Metabolizing Properties from Aquatic Habitats
Published on: December 7, 2021
Bacterial pyridine hydroxylation is ubiquitous in environment
Ji-Quan Sun1, Lian Xu, Yue-Qin Tang
1College of Engineering, Peking University, Beijing, 100871, People's Republic of China.
Applied Microbiology and Biotechnology
|March 23, 2013
Summary
Five bacterial strains capable of degrading phenol can also transform pyridine using phenol hydroxylase enzymes. This suggests a broader role for these enzymes in environmental pyridine breakdown than previously understood.
Area of Science:
- Microbiology
- Environmental Science
- Biochemistry
Background:
- Phenol-degrading bacteria are crucial for bioremediation.
- The metabolic pathways for pyridine transformation are not fully understood.
- Phenol hydroxylase enzymes are known to degrade aromatic compounds.
Purpose of the Study:
- To investigate the pyridine transformation capabilities of phenol-degrading bacteria.
- To identify the enzymes involved in pyridine breakdown.
- To explore the phylogenetic relationships of relevant genes.
Main Methods:
- Isolation and identification of ten phenol-degrading bacterial strains.
- Analysis of pyridine transformation using High-Performance Liquid Chromatography-Ultraviolet (HPLC-UV) and Liquid Chromatography-Mass Spectrometry (LC-MS).
- Heterologous expression of phenol hydroxylase genes (pheKLMNOP) and phylogenetic analysis.
Main Results:
- Five bacterial strains (Diaphorobacter, Acidovorax, Acinetobacter, Corynebacterium) transformed pyridine.
- Phenol hydroxylase genes were induced by both phenol and pyridine.
- Monohydroxylated pyridine was identified as a metabolite, confirming enzyme activity.
- Phylogenetic analysis placed these genes alongside those involved in degrading phenol, BTEX, and trichloroethylene.
Conclusions:
- Phenol hydroxylase enzymes can catalyze the hydroxylation of pyridine.
- Pyridine transformation via hydroxylation by phenol hydroxylase may be more widespread in the environment than previously thought.
- This finding has implications for understanding microbial degradation pathways in contaminated environments.
![[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
Related Concept Videos
01:25Basicity of Heterocyclic Aromatic Amines
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
01:26Bacterial Phylum Bacteroidota
The phylum Bacteroidota includes over 700 species classified into four primary orders: Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales. These gram-negative, non-sporulating rods exhibit saccharolytic capabilities and can be aerobic or fermentative, encompassing obligate aerobes, facultative aerobes, and obligate anaerobes. Many species display gliding motility, though some are nonmotile or use flagella. The genus Bacteroides is well-studied due to its significant role in...
01:28Biosynthesis of Nucleic Acids
Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
01:28Carbon-dioxide Fixation
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
01:30Anoxygenic Photosynthesis
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green sulfur bacteria, heliobacteria, and...
01:29Diversity of Archaea IV
Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist thermal...