Comparison of alcohol dehydrogenases from wild-type and mutant strain, JW200 Fe 4, of `Thermoanaerobacter ethanolicus`
- Univ. of Georgia, Athens, GA (United States)
A mutant strain of `Thermoanaerobacter ethanolicus` (ATCC 31550) designated JW200 Fe 4 contains primary and secondary alcohol dehydrogenases (ADHs). The primary ADH from JW200 Fe 4 was formed early in the growth cycle compared to the primary ADH from the wild-type strain (JW200 wt). The secondary ADH displayed 2.5-fold greater activity during the growth cycle of JW200 Fe 4 compared to the secondary ADH from JW200 Fe 4 were purified to homogeneity as determined by sodium dodecyl sulphate-gel electrophoresis. Relative molecular weight estimations indicated that both ADHs were tetrameric. Each ADH from JW200 Fe 4 contained approximately four Zn atoms per subunit and displayed Arrhenius plots similar to the ADHs from JW200 wt. The substrate specificity for the ADHs from JW200 Fe 4 was similar to that of the ADHs from JW200 wt. The secondary ADH oxidized 2-propanol at 51 times the rate of ethanol. Both ADHs from JW200 Fe 4 apparently reduce acetaldehyde to ethanol while only the secondary ADH from JW200 wt was suggested to contribute significantly to ethanol production.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AS09-79ER10499
- OSTI ID:
- 625679
- Journal Information:
- Applied Microbiology and Biotechnology, Vol. 37; Other Information: PBD: 1992
- Country of Publication:
- Germany
- Language:
- English
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