The denitrifying bacterium Acinetobacter johnsonii strain DBP-3 which was capable of removing phosphate, nitrate, and ammoniacal salt is psychrotolerant, whereas, the cold shock response mechanisms or the cold shock proteins (Csps) was unclear. In this article, the optimal growth temperature (25 °C) and cold shock temperature (7.5 °C) were determined firstly by an Arrhenius plot of the growth of the strain DBP-3. Then, among the seven cold shock-like protein genes which were cloned and identified referenced by A. johnsonii SH046 genome, qRT-PCR and shotgun-LTQ mass spectrometry showed that Csp3 and Csp4 were overexpressed under cold shock condition. Furthermore, Western blotting confirmed the result with the antibodies against Csp3 and Csp4 prepared by ourselves. Finally, the phylogenetic analysis showed that the similarity percent between Csp3 and Csp4 was 76.85 %, and Csp3 and Csp4 belonged to CspE family. The results indicated that CspE is overproduced by temperature downshift and may play an important role in the psychrotolerant process of strain DBP-3.
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This work was supported by the National Natural Science Foundation of China (51109089) and the Basic Scientific Research Fund of Jilin University (201003061).
Conflict of interest
The authors declare that they have no competing interests.
Dan Su and Linlin Hao contributed equally to this work.
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Su, D., Hao, L., Chen, F. et al. CspE is Overproduced by Temperature Downshift in the Acinetobacter johnsonii DBP-3. Curr Microbiol 72, 563–569 (2016). https://doi.org/10.1007/s00284-015-0979-3
- Cold Shock
- Cold Shock Protein
- Cold Shock Response
- Temperature Downshift
- Cold Shock Treatment