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| Content Provider | PubMed Central |
|---|---|
| Author | Dror, Y. Freeman, A. |
| Abstract | Bacillus megaterium (ATCC 13368) exhibits cytochrome P-450 monooxygenase activity (referred to herein as Cyt P-450 meg) catalyzing 15 beta-steroid hydroxylation. This activity belongs to the widespread ferredoxin reductase-ferredoxin-Cyt P-450 type of monooxygenases, providing a representative model system for this type of activity. The level of Cyt P-450 meg activity reaches its maximum in the cells during the stationary phase of the growth curve and is not affected by Cyt P-450 inducers. Here we present the development of an approach for stabilizing the Cyt P-450 meg system so that it performs continuous steroid hydroxylation and will be a model system for Cyt P-450-based detoxification. It is based on cell immobilization and simulation of stationary-phase conditions in a continuously operated fluidized-bed bioreactor. The combination of an appropriate immobilization technique, operational conditions, and medium composition provided a stabilized cell environment resulting in "freezing" of a physiological steady-state analog under stationary phase conditions, allowing stable performance of continuous hydroxylation for several weeks. It is suggested that this approach may be extended for use with other environmentally induced enzymatic activities. |
| Starting Page | 855 |
| File Format | |
| ISSN | 10985336 |
| e-ISSN | 10985336 |
| Journal | Applied and Environmental Microbiology |
| Issue Number | 3 |
| Volume Number | 61 |
| Language | English |
| Publisher Date | 1995-03-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Food Science Applied Microbiology and Biotechnology Biotechnology |
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