Anaerobic formation of succinate from glucose and bicarbonate in resting cells of Leishmania donovani

The cell suspension of Leishmania donovani incorporates ¹⁴CO₂ resulting in the formation of ¹⁴C]-succinic acid under anaerobic conditions. The results showed that the ¹⁴C]-succinate formation from 1-¹⁴C]-glucose is much greater than that from 6-¹⁴C]-glucose. ¹⁴C-pyruvate] takes part in the production of succinic acid under anaerobic conditions without decarboxylation. The anaerobic formation of succinate appears to involve the production of malate, which is then converted to succinate via the reduction of fumarate by the reversal of the tricarboxylic acid cycle. Evidence indicated that the active species in this carboxylation reaction was CO₂ although HCO₃ was active to some extent.