This zinc-finger domain is at the very C-terminus of a number of different TFIIIC subunit proteins. This domain might be involved in protein-DNA and/or protein-protein interactions [1].

1: The TFIIIC90 subunit of TFIIIC interacts with multiple components of the RNA polymerase III machinery and contains a histone-specific acetyltransferase activity. Hsieh YJ, Kundu TK, Wang Z, Kovelman R, Roeder RG; Mol Cell Biol. 1999;19:7697-7704. PMID:10523658