Mechanism of catalase induction in Rhodopseudomonas spheroides: Role of porphyrin excretion |
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Authors: | K T Shanmugam Leslie R Berger |
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Institution: | (1) Department of Microbiology, University of Hawai, 96822 Honolulu, Hawai;(2) Present address: Department of Cell Physiology, University of California, 94720 Berkeley, California |
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Abstract: | Summary Catalase induction in Rhodopseudomonas spheroides and three locally isolated strains of Rhodopseudomonas (TL-1, TL-4 and Rps. D) was studied. A correlation between the rate of excretion of porphyrin and the inducibility of the culture was observed. 8-hydroxyquinoline at 4x10-5 M had no effect on Bchl synthesis but it inhibited porphyrin excretion and catalase induction in Rhodopseudomonas spheroides. 8-OH Q at this concentration partially inhibited Bchl synthesis and catalase induction in strain TL-1. The data indicate that the amount of catalase produced is dependent on the pool size of porphyrins.Abbreviations used ALA
-amino laevulinic acid
- Bchl
Bacteriochlorophyll
- EDTA
Ethylene diamine tetra acetate
- DMSO
Dimethyl sulfoxide
- 8-OH Q
8-hydroxyquinoline
- nm
nanometer
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Rh.
Rhodopseudomonas
This work is part of a thesis submitted by K. T. Shanmugam in partial fulfillment of the requirements for the Ph. D. degree. |
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