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Subunit interactions in the three PfuPCNA crystals and comparison of interdomain angles. Wild-type PfuPCNA forms a troidal trimer with C-terminal domain to N-terminal domain alignment (two molecules in the trimer are shown here). Both two mutant PfuPCNAs form V-shaped dimers with C-terminal to C-terminal alignment. Interdomain angles at the intramolecular interface and the intermolecular interface were represented by θ1 and θ2, respectively.
