Histone H2A type 2-A (Hist2h2aa3)

Core part of nucleosome. Nucleosomes compact and wrap DNA into chromatin, restricting DNA access to the cellular machineries which require DNA as a template.

Histones thus play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability. DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling (By similarity).