Abstract
A gram-negative rod-shaped bacterium capable of utilizing acrylonitrile as the sole source of nitrogen was isolated from industrial sewage and identified as Klebsiella pneumoniae. The isolate was capable of utilizing aliphatic nitriles containing 1 to 5 carbon atoms or benzonitrile as the sole source of nitrogen and either acetamide or propionamide as the sole source of both carbon and nitrogen. Gas chromatographic and mass spectral analyses of culture filtrates indicated that K. pneumoniae was capable of hydrolyzing 6.15 mmol of acrylonitrile to 5.15 mmol of acrylamide within 24 h. The acrylamide was hydrolyzed to 1.0 mmol of acrylic acid within 72 h. Another metabolite of acrylonitrile metabolism was ammonia, which reached a maximum concentration of 3.69 mM within 48 h. Nitrile hydratase and amidase, the two hydrolytic enzymes responsible for the sequential metabolism of nitrile compounds, were induced by acrylonitrile. The optimum temperature for nitrile hydratase activity was 55°C and that for amidase was 40°C; both enzymes had pH optima of 8.0.
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Abbreviations
- PBM:
-
phosphate buffered medium
- GC:
-
gas chromatography
- GC/MS:
-
gas chromatography/mass spectrometry
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Nawaz, M.S., Franklin, W., Campbell, W.L. et al. Metabolism of acrylonitrile by Klebsiella pneumoniae . Arch. Microbiol. 156, 231–238 (1991). https://doi.org/10.1007/BF00249120
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DOI: https://doi.org/10.1007/BF00249120