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Solution structure of the PabPCNA. A, fits of the calculated SAXS profiles of closed (purple, χ2 = 0.806) and split (green, χ2 = 0.9324) ring models for PabPCNA to the experimental (blue) SAXS data. P(r) function is shown in the inset. Ab initio shape predictions for closed (B) and split (C) ring models of PabPCNA. The crystallographic model of PabPCNA (see ”Experimental Procedures“) is overlaid on the molecular envelope calculated for the closed ring model.
