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Mechanism of catalase induction in Rhodopseudomonas spheroides: Role of porphyrin excretion


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.

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δ-amino laevulinic acid




Ethylene diamine tetra acetate


Dimethyl sulfoxide

8-OH Q:




Rh. :



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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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Shanmugam, K.T., Berger, L.R. Mechanism of catalase induction in Rhodopseudomonas spheroides: Role of porphyrin excretion. Archiv. Mikrobiol. 69, 197–205 (1969).

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  • Catalase
  • Porphyrin
  • Pool Size
  • Porphyrin Excretion
  • Rhodopseudomonas Spheroides