Fig 1: SUMO2-PCNA enriches CAF1 and FACT within the replication complex. a Western blot analysis of the indicated proteins in the CB fractions (left) and the FLAG-PCNA complexes purified from CB fractions (right) prepared from cells expressing the indicated FLAG-tagged proteins. Ub-KR indicates the FLAG-ubiquitin-PCNA (KR) fusion protein. b Western blot analysis of the indicated proteins in the CB input (left panels) used for the in vitro pull-down experiments of purified recombinant strep-tagged PCNA, SUMO2-conjugated PCNA, and GFP anchored to Strep-Tactin resins (right panels). SUMO2-modified PCNA was generated by the in vitro SUMOylation reaction using strep-PCNA and His-SUMO2 shown in Supplementary Fig. 6a, b. c Western blot analysis of the input levels of recombinant strep-PCNA and strep-SUMO2-PCNA fusion (S2-PCNA) purified from E. coli (left panel) and of strep-PCNA and strep-S2-PCNA pulled down by WT or SIM mutant FLAG-CAF1A proteins purified and anchored on FLAG M2 agarose beads from HEK293T cells expressing the corresponding constructs (right panels). d Western blot analysis of strep-S2-PCNA (upper 2 panels) and strep-PCNA (lower 2 panels) pulled down by FLAG-CAF1A purified from E. coli and anchored on FLAG M2 agarose beads. e Western blot analysis of the indicated proteins in the CB input prepared from HEK293T cells expressing FLAG-SSRP1 WT or SIM mutant (left panels) and of FLAG-SSRP1 and SPT16 pulled down from the CB fractions in vitro using purified recombinant strep-tagged PCNA, S2-PCNA, and GFP anchored to Strep-Tactin resins (right panels)