This is the C-terminal, Delta, part of the TAF8 protein [1]. The N-terminal is generally the histone fold domain, Bromo_TP (Pfam:PF07524). TAF8 is one of the key subunits of the transcription factor for pol II, TFIID. TAF8 is one of the several general cofactors which are typically involved in gene activation to bring about the communication between gene-specific transcription factors and components of the general transcription machinery [2].

1: The TBN protein, which is essential for early embryonic mouse development, is an inducible TAFII implicated in adipogenesis. Guermah M, Ge K, Chiang CM, Roeder RG; Mol Cell. 2003;12:991-1001. PMID:14580349

2: The general transcription machinery and general cofactors. Thomas MC, Chiang CM; Crit Rev Biochem Mol Biol. 2006;41:105-178. PMID:16858867