Histone modification domain (HMD) of Rtf1 directly contacts Rad6 in vivo
HMD structure and in vivo crosslinking identify a conserved Rad6 interaction surface
Paf1C regulates global H2B ubiquitylation (ub) patterns by linking HMD to Pol II
HMD stimulates Bre1-dependent H2Bub in a transcription-free, reconstituted assay