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- W1657881138 abstract "In a previous publication (Narhi, L. O., and Fulco, A. J. (1986) J. Biol. Chem. 261, 7160-7169) we described the characterization of a 119,000-dalton P-450 cytochrome that is strongly induced by barbiturates in Bacillus megaterium. In the presence of NADPH and O2, this single polypeptide can catalyze the hydroxylation of long-chain fatty acids without the aid of any other protein. The gene encoding this unique monooxygenase (cytochrome P-450BM-3) has now been cloned by an immunochemical screening technique. The Escherichia coli clone harboring the recombinant plasmid produces a 119,000-dalton protein that appears to be electrophoretically and immunochemically identical to the B. megaterium enzyme and contains the same N-terminal amino acid sequence. The recombinant DNA product also exhibits the characteristic cytochrome P-450 spectrum and is fully functional as a fatty acid monooxygenase. In E. coli, the synthesis of P-450BM-3 is directed by its own promoter included in the DNA insert and proceeds constitutively at a very high rate but is not stimulated by pentobarbital. However, when the cloned P-450BM-3 gene, either intact or in a truncated form, is introduced back into B. megaterium via an E. coli/Bacillus subtilis shuttle vector, its expression is constitutively repressed but is induced by pentobarbital. This finding demonstrates that the regulatory region of the P-450BM-3 gene that responds to barbiturates is included in the cloned DNA. The evidence also indicates that pentobarbital cannot directly act on the gene to cause induction but presumably interacts with another component such as a repressor molecule that is present in B. megaterium but is absent in the E. coli clone." @default.
- W1657881138 created "2016-06-24" @default.
- W1657881138 creator A5003397600 @default.
- W1657881138 creator A5033595397 @default.
- W1657881138 date "1987-05-01" @default.
- W1657881138 modified "2023-09-30" @default.
- W1657881138 title "Cloning of the gene encoding a catalytically self-sufficient cytochrome P-450 fatty acid monooxygenase induced by barbiturates in Bacillus megaterium and its functional expression and regulation in heterologous (Escherichia coli) and homologous (Bacillus megaterium) hosts." @default.
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- W1657881138 doi "https://doi.org/10.1016/s0021-9258(18)48295-6" @default.
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