CCA-addition in the cold: Structural characterization of the psychrophilic CCA-adding enzyme from the permafrost bacterium Planococcus halocryophilus

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Abstract
• A high-resolution structure of a psychrophilic RNA polymerase contributes to our knowledge of cold adaptation. • While catalytic core motifs are conserved, at least one shows cold adaptation. • Loss of helix-capping increases structural flexibility in a catalytic core motif. • Overall reduction of alpha-helical elements appears as a strategy for cold adaptation.

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