Importance of the Transcription of Proline Transporter ProP Gene in Quick Adaptation of Escherichia Coli Cells under High Salinity

概要

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The effect of the transcription of proline transporter genes on the mechanism of quick adaptation of Escherichia coli cells under high salinity was analyzed. E. coli has three independent proline transporters, namely PutP, ProP and ProU. By using moderate salinity stress method, we made three different types of E. coli cells which transcript proline transporter genes: (i) PutP gene; (ii) PutP and ProP genes; (iii) PutP, ProP and ProU genes. Although the growth of type (i) E. coli cell was inhibited at 1.2M NaCl culture condition, type (ii) and (iii) cells showed the recovery of growth. The uptake of proline by E. coli as compatible solute was in good accordance with those of cell growth. These data showed that the transcription of proline transporter ProP played an important role in E. coli cells adapted with 1.2M NaCl culture conditions rapidly.
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