Light stimulated ‘shunt-metabolism’ succinate-α-ketoglutarate-isocitrate cycle and accumulation of citric acid inAspergillus niger

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Abstract
Studies with light of the visible range had shown that light plays a significant role in the biosynthesis and accumulation of citric acid inAspergillus niger. Accumulation of14C-labelled carbon atoms in α-ketoglutaric, isocitric, succinic and glycolic acids in the cultures grown under illumination suggest a probable ‘shunt-metabolism’ leading to the succinate-α-ketoglutarate-isocitrate (SKI) cycle. This shunt metabolism minimizes the accumulation of citric acid in cultures due to depletion of intermediates.