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Studies on L-Serine Deaminase in Escherichia coli K-12

¹ Department of Biological Sciences, Sir George Williams University, Montreal 107, Quebec, Canada

ABSTRACT

L-Serine deaminase has been studied in toluene-treated cells of Escherichia coli K-12 and shown to be a discrete entity distinct from L-threonine deaminase. Its level in the cell varies as a function of nitrogen nutrition, carbon source, and amino acids (glycine and leucine). The metabolic role of the enzyme remains unclear but may be related to serine toxicity. The enzyme is unstable within the cell in the presence of its inducers, glycine and leucine, but not in their absence.

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