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The effect of the amount of the proline transporter PutP expression on the mechanism of adaptation of E. coli cells to high salinity was analyzed. The PutP gene derived from the E. coli expression plasmid was introduced into the E. coli cell, and a high PutP expression strain was developed. At 1.2 M NaCl culture condition, the growth of normal E. coli cells was inhibited, whereas high ProP expression cells showed growth under 2.5 M NaCl conditions. The uptake of proline by E. coli as a compatible solute and substrate for metabolization was in good accordance with those seen in cell growth. These data suggested that the amount of the proline transporter PutP expression played an important role in the adaptation of E. coli cells to high saline conditions.

Importance of the High-Expression of Proline Transporter PutP to the Adaptation of <i>Escherichia coli</i> to High Salinity