Fig. 3.
Superimposition of the PCNA monomer backbone of wild type and mutant PCNA proteins. The monomeric subunit is lying on its side with the inter-domain connector loop in the back to allow the separate domains to be easily viewed. The adjacent mutant monomeric subunit is shown in blue with the G178S substitution indicated. The G178S substitution, the site of mono-ubiquitination (Lys-164), and loop J are indicated. Domains A and B of the monomeric subunit are separated by a dashed line and the RMSD values were independently determined for each domain.
