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Microbial degradation of acrylamide monomer
R Shanker1, C Ramakrishna, P K Seth
1Industrial Toxicology Research Centre, Lucknow, India.
Archives of Microbiology
|January 1, 1990
Summary
A novel Pseudomonas bacterium isolated from tropical soil effectively degrades acrylamide, a neurotoxic industrial chemical. This microorganism utilizes the degradation products, acrylic acid and ammonia, as essential nutrients for growth.
Area of Science:
- Microbiology
- Environmental Science
- Biotechnology
Background:
- Acrylamide is a neurotoxic industrial chemical with widespread applications.
- Microbial degradation offers a potential bioremediation strategy for acrylamide contamination.
Purpose of the Study:
- To isolate and characterize a soil bacterium capable of degrading acrylamide.
- To investigate the biochemical pathway and enzymatic mechanisms involved in acrylamide degradation.
Main Methods:
- Enrichment culture technique using soil microorganisms.
- Bacterial isolation, identification (morphological and biochemical tests), and characterization.
- Growth studies with high acrylamide concentrations and analysis of degradation products.
- Enzyme activity assays to determine substrate specificity and regulation.
Main Results:
- Isolation of an aerobic, Gram-negative, motile bacterium identified as Pseudomonas sp.
- Demonstrated degradation of high acrylamide concentrations (4 g/l) to acrylic acid and ammonia.
- Identified an amidase enzyme responsible for acrylamide hydrolysis, with specific substrate preferences.
- Observed catabolite repression of the amidase by succinate.
Conclusions:
- Pseudomonas sp. is capable of efficiently degrading acrylamide, utilizing it as a sole carbon and nitrogen source.
- The bacterium employs an amidase enzyme for acrylamide hydrolysis, which exhibits specific substrate range and is subject to catabolite repression.
- This finding highlights the potential of Pseudomonas sp. for bioremediation of acrylamide-polluted environments.