The Ess1 prolyl isomerase is required for transcription termination of small noncoding RNAs via the Nrd1 pathway.
Singh N, Ma Z, Gemmill T, Wu X, Defiglio H, Rossettini A, Rabeler C, Beane O, Morse RH, Palumbo MJ, et al. Mol Cell. 2009 Oct 23; 36(2):255-66.