Summary
A cytochrome containing fraction virtually devoid of the photosynthetic apparatus (bacteriochlorophyll and/or chromatophores) was isolated from Rps. palustris grown photolithotrophically with S2O3 =as the exogenous electron donor. This fraction contained predominantly cytochromes of c, a and o type and exhibited thiosulfate: cytochrome c oxidoreductase and ferrocytochrome c:O2 oxidoreductase activities. Under anaerobic conditions the enzyme preparation catalyzed an ATP-dependent NAD+ reduction by S2O3 =in the dark involving a reversal of electron transfer from cytochrome c and yielding a molar stoichiometry of approximately 2:1 for the ferrocytochrome c oxidized and NAD+ reduced. In this process approximately 4 to 7 molar equivalents of ATP were utilized/equivalent of NAD+ reduced. The optimal reaction occurred at pH 8.0 and in the presence of 55 μM added mammalian cyt. c, 1.7 mM Mg++, 1.7 mM ATP and 7.0 mM S2O3 =. The S2O3 =-linked ATP-driven reduction of NAD+ as well as the coupled oxidation of cyt. c were inhibited completely by 5 μm CCCP or 10 μM DNP and the reaction was also markedly sensitive to other uncouplers of the energy transfer reactions. The pathway of electron transfer from S2O3 = to NAD+ appears to involve cyt. c, b, and flavoprotein systems as evidenced by the complete inhibition of the process by low concentrations of antimycin A, NOQNO, rotenone and amytal.
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Abbreviations
- BAL:
-
British Anti-Lewisite (2,3-Dimercaptopropanol)
- CCCP:
-
Carbonyl-cyanide-m-chlorophenylhydrazone
- DBP:
-
2,6-Dibromophenol
- DNP:
-
2,4-Dinitrophenol
- EDTA:
-
Ethylenediamine tetraacetic acid
- GSH:
-
reduced glutathione
- NOQNO:
-
2-n-Nonyl-4-hydroxyquinoline-N-oxide
- PCP:
-
Pentachlorophenol
- PABA:
-
p-aminobenzoic acid.
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Knobloch, K., Eley, J.H. & Aleem, M.I.H. Thiosulfate-linked ATP-dependent NAD+ reduction in Rhodopseudomonas palustris . Archiv. Mikrobiol. 80, 97–114 (1971). https://doi.org/10.1007/BF00411876
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DOI: https://doi.org/10.1007/BF00411876