This is the CAF1-binding domain of CCR4-NOT transcription complex. It adopts a MIF4G (middle portion of eIF4G) fold [1].

1: The structural basis for the interaction between the CAF1 nuclease and the NOT1 scaffold of the human CCR4-NOT deadenylase complex. Petit AP, Wohlbold L, Bawankar P, Huntzinger E, Schmidt S, Izaurralde E, Weichenrieder O; Nucleic Acids Res. 2012;40:11058-11072. PMID:22977175