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The structure of Caulobacter crescentus polynucleotide phosphorylase. (a) Linear schematic of domain organization, showing the two RNase PH domains, the helical domain, the KH and S1 RNA-binding domains. (b) A schematic of the structure of the trimeric C. crescentus PNPase. (i) Side view and (ii) perpendicular view along the threefold axis. For one of the protomers, the individual subdomains are colour coded according to the scheme in figure 1a. The other two protomers are grey.
