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Periplasmic location of p-cresol methylhydroxylase in Pseudomonas putida
Abstract:
The cellular location of the flavocytochrome c, p-cresol methylhydroxylase was investigated in two strains of Pseudomonas putida. In both cases the enzymes were shown to be located in the periplasmic fraction by their release during treatment of the bacteria with EDTA and lysozyme in a solution containing a high concentration of sucrose. For strain NCIB 9869 the finding is in accord with the suggestion that the physiological acceptor for the enzyme is azurin as this too was shown to be located mostly in the periplasm.
Insights
Researchers investigated the location of p-cresol methylhydroxylase in Pseudomonas putida. The enzyme was found in the periplasmic fraction, supporting its role alongside azurin in bacterial metabolism.
Area of Science:
- Microbiology
- Enzymology
- Bacterial Physiology
Background:
- Pseudomonas putida is a bacterium known for its metabolic versatility.
- Flavocytochrome c, p-cresol methylhydroxylase is an enzyme involved in aromatic compound degradation.
- Understanding enzyme localization is crucial for elucidating metabolic pathways.
Purpose of the Study:
- To determine the cellular location of flavocytochrome c, p-cresol methylhydroxylase in Pseudomonas putida.
- To investigate the relationship between this enzyme and azurin in strain NCIB 9869.
Main Methods:
- Enzyme activity assays.
- Bacterial cell fractionation using EDTA and lysozyme treatment.
- Sucrose density gradient centrifugation.
- Azurin localization analysis.
Main Results:
- Flavocytochrome c, p-cresol methylhydroxylase was localized to the periplasmic fraction in both studied Pseudomonas putida strains.
- The enzyme's release was induced by EDTA and lysozyme treatment in high sucrose concentration.
- Azurin was also predominantly found in the periplasmic fraction for strain NCIB 9869.
Conclusions:
- The periplasmic localization of flavocytochrome c, p-cresol methylhydroxylase suggests a role in extracellular or periplasmic metabolic processes.
- The co-localization with azurin in strain NCIB 9869 supports the hypothesis that azurin acts as a physiological electron acceptor for this enzyme.