En bloc transfer of polyubiquitin chains to PCNA in vitro is mediated by two different human E2-E3 pairs.
Masuda Y, Suzuki M, Kawai H, Hishiki A, Hashimoto H, Masutani C, Hishida T, Suzuki F, Kamiya K. Nucleic Acids Res. 2012 Nov 1; 40(20):10394-407. Epub 2012 Aug 16.