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Crenarchaeal PCNA is known to consist of three subunits (PCNA1, PCNA2 and PCNA3) that form a heterotrimer (PCNA123). Recently, another heterotrimeric PCNA composed of only PCNA2 and PCNA3 was identified in Sulfolobus tokodaii strain 7 (stoPCNAs). In this study, the purified stoPCNA2-stoPCNA3 complex was crystallized by hanging-drop vapour diffusion. The crystals obtained belonged to the orthorhombic space groups I222 and P21212, with unit-cell parameters a = 91.1, b = 111.8, c = 170.9 Å and a = 91.1, b = 160.6, c = 116.6 Å, respectively. X-ray diffraction data sets were collected to 2.90 Å resolution for the I222 crystals and to 2.80 Å resolution for the P21212 crystals.

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