Nucleotide sequencing and transcriptional mapping of the genes encoding biphenyl dioxygenase, a multicomponent polychlorinated-biphenyl-degrading enzyme in Pseudomonas strain LB400
| Autor: | F J Mondello, B D Erickson |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Iron-Sulfur Proteins
Transcription Genetic Molecular Sequence Data Toluene dioxygenase Reductase Microbiology Dioxygenase Pseudomonas Sequence Homology Nucleic Acid Consensus sequence Amino Acid Sequence Molecular Biology Peptide sequence Ferredoxin biology Base Sequence Pseudomonas putida organic chemicals Nucleic acid sequence Chromosome Mapping biology.organism_classification humanities Biochemistry Oxygenases bacteria Ferredoxins Oxidoreductases Research Article |
| Zdroj: | Journal of bacteriology. 174(9) |
| ISSN: | 0021-9193 |
| Popis: | The DNA region encoding biphenyl dioxygenase, the first enzyme in the biphenyl-polychlorinated biphenyl degradation pathway of Pseudomonas species strain LB400, was sequenced. Six open reading frames were identified, four of which are homologous to the components of toluene dioxygenase from Pseudomonas putida F1 and have been named bphA, bphE, bphF, and bphG. From this comparison, biphenyl dioxygenase was found to be a multicomponent enzyme containing a two-subunit iron-sulfur protein, a ferredoxin, and a reductase. Comparison of the large subunit of the iron-sulfur protein and the ferredoxin with other multicomponent dioxygenases identified amino acid sequences similar to Rieske iron-sulfur proteins for binding a [2Fe-2S] cluster. Sequences have also been identified in the reductase component that match the consensus sequence for FAD or NAD binding. Transcription of the biphenyl dioxygenase region was examined, and three transcription initiation sites were identified. Transcription initiating at the site furthest upstream is greatly increased when the LB400 cells are grown on biphenyl as the sole carbon source. |
| Databáze: | OpenAIRE |
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