This is the zinc-finger at the start of transcription-binding factor that associates strongly with both Rrn6 and Rrn7 to form a complex which itself binds the TATA-binding protein and is required for transcription by the core domain of the RNA PolI promoter [1,2,3].

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: A novel 66-kilodalton protein complexes with Rrn6, Rrn7, and TATA-binding protein to promote polymerase I transcription initiation in Saccharomyces cerevisiae. Lin CW, Moorefield B, Payne J, Aprikian P, Mitomo K, Reeder RH; Mol Cell Biol. 1996;16:6436-6443. PMID:8887672

3: 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