Abstract
Cell-free extracts of Cyanidium caldarium grown on glutamate as the sole nitrogen source, contain at least twice the nitrate reductase activity present in extracts from nitrate-grown cells. Ammonia or ammonia plus nitrate-grown cells do not contain enzyme. However, after nitrogen starvation, they attain very high levels of activity. The enzyme formed in glutamate-grown cells, like the enzyme found in nitrogen-starved cells, is almost totally active, in contrast to the enzyme formed in nitrate-grown cells which is 58% latent. The role of the nitrogen source in the regulation of nitrate reductase activity is discussed.
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