RNA polymerase I-specific transcription-initiation factor Rrn6 is a component of a multisubunit core transcription factor, essential for the initiation of rDNA transcription by Pol I [1,2]. The DNA-bound core factor (CF) resembles a right hand holding the DNA molecule between the fingers and the palm, with the thumb pointing toward Pol I. The palm is composed of the N-terminal regions of Rrn11 and Rrn6, the thumb is composed of the C-terminal of Rrn11 while the fingers and knuckles are composed of Rrn7 and the C-terminal half of Rrn6, respectively [2,3]. This entry represents the beta-propeller domain of Rrn6 which is part of the palm (or module I in [1]) of the CF which interacts with Rrn11 [2,3].

1: RRN6 and RRN7 encode subunits of a multiprotein complex essential for the initiation of rDNA transcription by RNA polymerase I in Saccharomyces cerevisiae. Keys DA, Vu L, Steffan JS, Dodd JA, Yamamoto RT, Nogi Y, Nomura M; Genes Dev. 1994;8:2349-2362. PMID:7958901

2: Structural Basis of RNA Polymerase I Transcription Initiation. Engel C, Gubbey T, Neyer S, Sainsbury S, Oberthuer C, Baejen C, Bernecky C, Cramer P; Cell. 2017;169:120-131. PMID:28340337

3: Structural mechanism of ATP-independent transcription initiation by RNA polymerase I. Han Y, Yan C, Nguyen THD, Jackobel AJ, Ivanov I, Knutson BA, He Y; Elife. 2017; [Epub ahead of print] PMID:28623663