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Distribution of aldoxime dehydratase in microorganisms
1Biotechnology Research Center, Faculty of Engineering, Toyama Prefectural University, Kosugi, Toyama 939-0398, Japan.
Applied and Environmental Microbiology
|June 1, 2000
Summary
Microbial degradation of aldoximes is widespread, with bacteria, actinomyces, and fungi showing significant activity. These microbes possess both aldoxime dehydration and nitrile hydrolysis capabilities, indicating a key role in nitrile compound metabolism.
Area of Science:
- Microbiology
- Biochemistry
- Enzymology
Background:
- Aldoximes are organic compounds with potential industrial applications.
- Understanding microbial pathways for aldoxime degradation is crucial for bioremediation and biocatalysis.
- Previous research has identified some microorganisms capable of degrading specific aldoximes.
Purpose of the Study:
- To investigate the distribution of phenylacetaldoxime-degrading and pyridine-3-aldoxime-degrading abilities across a diverse range of microorganisms.
- To characterize the enzymatic activities associated with aldoxime degradation, specifically aldoxime dehydration and nitrile hydrolysis.
- To determine if nitrile-degrading microorganisms also possess aldoxime dehydration activity.
Main Methods:
- Screening of 975 microbial strains (bacteria, actinomyces, yeasts, fungi) for aldoxime degradation using intact cells.
- Quantification of aldoxime decrease via high-pressure liquid chromatography (HPLC).
- Assay of aldoxime dehydration (to nitrile) and nitrile-hydrolyzing activities in active strains.
- Examination of aldoxime dehydration activity in known nitrile-degrading microorganisms.
Main Results:
- Aldoxime-degrading abilities were widely distributed among bacteria, actinomyces, fungi, and some yeasts.
- 98 strains degraded phenylacetaldoxime and 107 strains degraded pyridine-3-aldoxime.
- All active aldoxime degraders also exhibited nitrile-hydrolyzing activity.
- All 19 tested nitrile-degrading microorganisms showed aldoxime dehydration activity.
- Aldoxime dehydratase and nitrile-hydrolyzing activities were induced by aldoximes or nitriles.
Conclusions:
- Aldoxime degradation is a common capability among diverse microbial groups.
- The enzymes responsible for aldoxime dehydration and nitrile hydrolysis are frequently co-expressed.
- Nitrile-degrading microorganisms possess the enzymatic machinery for aldoxime dehydration, suggesting a broader role in nitrile compound metabolism.