Ubiquitous transcription factor required for a diverse set of processes. It is a component of the CCR4 complex involved in the control of gene expression (By similarity). Exonucleolytic cleavage of poly(A) to 5'-AMP. Component of the CCR4-NOT complex, at least composed of CRR4 and CAF1 proteins. A number of isoforms are produced. According to EST sequences. Expressed in flowers. Belongs to the CAF1 family.