Members of this family are part of the Paf1/RNA polymerase II complex [1,2]. The Paf1 complex probably functions during the elongation phase of transcription [1]. The Leo1 subunit of the yeast Paf1-complex binds RNA and contributes to complex recruitment. The subunit acts by co-ordinating co-transcriptional chromain modifications and helping recruitment of mRNA 3prime-end processing factors [3].

1: The Paf1 complex physically and functionally associates with transcription elongation factors in vivo. Squazzo SL, Costa PJ, Lindstrom DL, Kumer KE, Simic R, Jennings JL, Link AJ, Arndt KM, Hartzog GA; EMBO J 2002;21:1764-1774. PMID:11927560

2: Ctr9, Rtf1, and Leo1 are components of the Paf1/RNA polymerase II complex. Mueller CL, Jaehning JA; Mol Cell Biol 2002;22:1971-1980. PMID:11884586

3: The Leo1 subunit of yeast Paf1 complex binds RNA and contributes to complex recruitment. Dermody JL, Buratowski S; J Biol Chem. 2010; [Epub ahead of print] PMID:20732871