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A proline-producing strain of Serratia marcescens grew more rapidly than the wild-type strain in a medium of high osmolarity due to high concentrations of NaCl, KCI, Na2S0,, (NH&HPO,, sodium glutamate, glucose or sucrose. Growth inhibition by NaCl was partially reversed by proline in the wild-type strain, and by glutamate and proline in the proline-producing strain. Intracellular proline and glutamate concentrations under conditions of high osmolarity were studied. The wild-type strain accumulated endogenously synthesized glutamate, and concen- trated proline taken up from the external medium. In contrast, the proline-producing strain accumulated a large amount of endogenously synthesized proline. This increased proline content contributes to the osmotolerance of the proline-producing strain. The growth inhibition by NaCl was also reversed by glycinebetaine in S. marcescens wild-type and proline-producing strains.

Osmoregulation in a Proline-producing Strain of Serratia marcescens