This is the zinc finger domain of TOPLESS and TOPLESS-related proteins, plant transcriptional co-repressors [1-3].

1: Structural basis for recognition of diverse transcriptional repressors by the TOPLESS family of corepressors. Ke J, Ma H, Gu X, Thelen A, Brunzelle JS, Li J, Xu HE, Melcher K; Sci Adv. 2015;1:e1500107. PMID:26601214

2: A D53 repression motif induces oligomerization of TOPLESS corepressors and promotes assembly of a corepressor-nucleosome complex. Ma H, Duan J, Ke J, He Y, Gu X, Xu TH, Yu H, Wang Y, Brunzelle JS, Jiang Y, Rothbart SB, Xu HE, Li J, Melcher K; Sci Adv. 2017;3:e1601217. PMID:28630893

3: Structure of the Arabidopsis TOPLESS corepressor provides insight into the evolution of transcriptional repression. Martin-Arevalillo R, Nanao MH, Larrieu A, Vinos-Poyo T, Mast D, Galvan-Ampudia C, Brunoud G, Vernoux T, Dumas R, Parcy F; Proc Natl Acad Sci U S A. 2017;114:8107-8112. PMID:28698367