Unwinding activity of cold shock proteins and RNA metabolism

Sangita Phadtare

Research output: Contribution to journalReview articlepeer-review

30 Scopus citations


Temperature downshift from 37°C to 15°C results in the exertion of cold shock response in Escherichia coli, which induces cold shock proteins, such as CsdA. Previously, we showed that the helicase activity of CsdA is critical for its function in the cold acclimation of cells and its primary role is mRNA degradation. Only RhlE (helicase), CspA (RNA chaperone) and RNase R (exoribonuclease) were found to complement the cold shock function of CsdA. RNase R has two independent activities, helicase and ribonuclease, only helicase being essential for the functional complementation of CsdA. Here, we discuss the significance of above findings as these emphasize the importance of the unwinding activity of cold-shock-inducible proteins in the RNA metabolism at low temperature, which may be different than that at 37°C. It requires assistance of proteins to destabilize the secondary structures in mRNAs that are stabilized upon temperature downshift, hindering the activity of ribonucleases.

Original languageEnglish (US)
Pages (from-to)394-397
Number of pages4
JournalRNA Biology
Issue number3
StatePublished - 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Cell Biology


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