| Autor: | Annemieke F. Pronk, John Stigter, Adrian H. Stouthamer, Frans J. de Bruijn, Fred C. Boogerd |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
chemistry.chemical_classification
biology Mutant chemistry.chemical_element General Medicine biology.organism_classification Microbiology Oxygen Pigment Coproporphyrinogen Oxidase Enzyme chemistry Biochemistry Azorhizobium caulinodans visual_art visual_art.visual_art_medium Molecular Biology Anaerobic exercise Bacteria |
| Zdroj: | Antonie van Leeuwenhoek. 74:245-251 |
| ISSN: | 0003-6072 |
| DOI: | 10.1023/a:1001734626121 |
| Popis: | Azorhizobium caulinodans ORS571 was found to excrete moderate amounts of a fluorescent pigment into the culture medium in response to dissolved oxygen tensions below 1.0 kPa. The pigment was identified as coproporphyrin, on the basis of its optical and fluorescence spectra. FixLJ and fixK mutant derivatives of ORS571 were found to excrete 25-fold higher amounts of coproporphyrin under micro-aerobic conditions than the wild type strain. These observations suggest that A. caulinodans switches from an aerobic to an anaerobic coproporphyrinogen oxidase when the dissolved oxygen tension falls below 1.0 kPa and that the fixLJ and fixK genes are involved in the regulation of expression of the anaerobic coproporphyrinogen oxidase. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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