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Global architecture of the archaeal PCNAs. (a) Superposition of the characterised homotrimeric PCNAs showing the high conservation of secondary and tertiary structure. HvoPCNA (blue-3IFV); PfuPCNA (green-1GE8); Tko PCNAs (light blue/magenta—3LX1/3LX2); AfuPCNA (orange-1RWZ). (b) The heterotetrameric structure of Sulfolobus tokadii PCNA 2 and 3 (3AIZ) [6].
