Recombinant ZZ-type zinc finger-containing protein 3 (ZZZ3) fragment (residues 786-903), derived from Homo sapiens, offers a stable and soluble unit for investigating histone H3 recognition and its role in gene activation mechanisms. This 118-amino acid fragment is ideal for structural and biochemical studies, enabling researchers to explore epigenetic regulation with high reliability.

The full-length ZZZ3 protein functions as a histone H3 reader essential for the ATAC complex-mediated maintenance of histone acetylation and gene activation. As a component of the ATAC complex, it contributes to histone acetyltransferase activity targeting histones H3 and H4, playing a critical role in chromatin remodeling and transcriptional regulation. Located in the nucleus, ZZZ3 is pivotal in epigenetic processes, influencing cellular gene expression profiles. The selected fragment (786-903) was computationally designed to provide a stable, soluble representation for detailed analysis, supporting advancements in understanding epigenetic controls.