Abstract
In the cyanobacterium Anabaena cylindrica lactate accumulated in large amounts when the cells were exposed to light. The presence or absence of oxygen, or a change in CO2 concentration did not affect the lactate accumulation. The cellular succinate level also increased in the light when CO2 was supplied at the high concentration of 1%. 3-(3,4-dichlorophenyl)-1,1-dimethyl urea (DCMU), an inhibitor of photosynthetic electron flow, inhibited the increase in the concentration of lactate and succinate. Photosynthesis is a prerequisite for the increase of these organic acids. Thenoyltrifluoroacetone, an inhibitor of succinate dehydrogenase, inhibited the increase of succinate, suggesting that the succinate is formed via fumarate by the reverse of reactions of tricarboxylic acid (TCA) cycle. Upon addition of ammonium to the cell suspension in the light under high CO2 concentration, the increases in the concentrations of lactate and succinate were inhibited while those of glutamine, glutamate and aspartate were stimulated. Ammonium apparently changed the products of metabolism of pyruvate and oxaloacetate from lactate and succinate to amino acids.
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Abbreviations
- Chl:
-
chlorophyll
- DCMU:
-
3-(3,4-dichlorophenyl)-1,1-dimethyl urea
- TTFA:
-
thenoyltrifluoroacetone
- PCA:
-
perchloric acid
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Ohmori, M., Satoh, Y. & Urata, K. Light-induced accumulation of lactate and succinate in Anabaena cylindrica . Arch. Microbiol. 151, 101–104 (1989). https://doi.org/10.1007/BF00414421
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DOI: https://doi.org/10.1007/BF00414421