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. 2015 Aug 18;109(4):816–826. doi: 10.1016/j.bpj.2015.06.062

Figure 1.

Figure 1

The biological unit of PCNA (above) is a trimeric ring with a central hole for binding double-strand DNA. Viewing PCNA from the side shows the subunit interface between two PCNA monomers (blue). Histogram (below) showing the number of x-ray diffraction data sets within resolution bins for structures deposited in the PDB as of January 20, 2015. The experimental resolution and deposited MOLPROBITY scores for the PCNA data sets used in this study averaged 2.96 and 2.86 Å, respectively. Structures determined by the algorithm described here yielded a mean MOLPROBITY score of 1.25 Å.