A RNA polymerase with transcriptional activity at 0°C from the Antarctic bacterium Pseudomonas syringae

FEBS Letters

Seshu Kumar, G.¹  Jadhav, R.S.¹  Uma, S.¹  Ray, M.K.¹  Shivaji, S.¹ 

[1] Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India

关键词: Antarctic bacterium;    Psychrotroph;    Transcription at low temperature;    RNA polymerase;   

DOI  :  10.1016/S0014-5793(99)00660-2

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

A DNA-dependent RNA polymerase was purified from the Antarctic psychrotrophic bacterium Pseudomonas syringae. The RNA polymerase showed a typical eubacterial subunit composition with β, β′, α₂ and σ subunits. The subunits cross-reacted with antibodies raised against holoenzyme and the individual subunits of the RNA polymerase of Escherichia coli. However, the enzyme was considered unique, since unlike the RNA polymerase of mesophilic E. coli it exhibited significant and consistent transcriptional activity (10–15%) even at 0°C. But, similar to the enzyme from the mesophilic bacterium, the RNA polymerase from P. syringae exhibited optimum activity at 37°C. The study also demonstrates that the RNA polymerase of P. syringae could preferentially transcribe the cold-inducible gene cspA of E. coli only at lower temperatures (0–22°C). The polymerase was also observed to be relatively more rifampicin-resistant during transcription at lower temperature.

【 授权许可】

Unknown