Related Experiment Video
Updated: Aug 7, 2026
20:28
A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments
Published on: October 2, 2012
Dissimilation of aromatic compounds by Alcaligenes eutrophus
Journal of Bacteriology
|August 1, 1971
Summary
Alcaligenes eutrophus utilizes various aromatic compounds through distinct metabolic pathways. Researchers identified specific pathways for benzoate, phenol, and tryptophan degradation, revealing insights into microbial aromatic compound metabolism.
Area of Science:
- Microbiology
- Biochemistry
- Environmental Science
Background:
- Aromatic compounds are widespread in the environment.
- Understanding microbial degradation pathways is crucial for bioremediation.
- Alcaligenes eutrophus is a bacterium known for its metabolic versatility.
Purpose of the Study:
- To determine the range of aromatic compounds supporting Alcaligenes eutrophus growth.
- To elucidate the specific metabolic pathways involved in the dissimilation of these aromatic compounds.
- To investigate the metabolic fate of anthranilate and muconic acid isomers.
Main Methods:
- Enzymatic analyses were the primary method used.
- Growth studies with various aromatic substrates were conducted.
- Metabolic fate of specific intermediates was traced.
Main Results:
- The beta-ketoadipate pathway dissimilates benzoate and p-hydroxybenzoate.
- The genetisate pathway is involved in m-hydroxybenzoate dissimilation.
- The meta cleavage pathway degrades phenol and p-cresol.
- l-Tryptophan is oxidized to anthranilate, but its further metabolism was not determined.
- Metabolism of muconic acid stereoisomers was investigated.
Conclusions:
- Alcaligenes eutrophus employs specific, well-defined pathways for the degradation of diverse aromatic compounds.
- The study clarifies the catabolism of several key aromatic substrates by this bacterium.
- Further research is needed to fully establish the metabolic fate of anthranilate in Alcaligenes eutrophus.
More Related Videos
11:44Qualitative Characterization of the Aqueous Fraction from Hydrothermal Liquefaction of Algae Using 2D Gas Chromatography with Time-of-flight Mass Spectrometry
Published on: March 6, 2016
10:03Isolation, Propagation, and Identification of Bacterial Species with Hydrocarbon Metabolizing Properties from Aquatic Habitats
Published on: December 7, 2021
Related Concept Videos
01:16Electrophilic Aromatic Substitution: Overview
In an electrophilic aromatic substitution reaction, an electrophile substitutes for a hydrogen of an aromatic compound.
01:11Nucleophilic Aromatic Substitution: Elimination–Addition
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is confirmed through isotopic...
01:15Metabolism of Chemolithotrophs
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation. However, because inorganic electron donors...
01:18Amino Acid Catabolism
Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
01:26Microbes and Methanogenesis
Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
01:26Microbial Bioremediation of Hydrocarbons
Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...