H3T45P (original) (raw)

H3T45P is an epigenetic modification to the DNA packaging protein histone H3. It is a mark that indicates the phosphorylation the 45th threonine residue of the histone H3 protein. During apoptosis, H3T45 phosphorylation is required for structural changes inside the nucleosome that enable DNA nicking and/or fragmentation. Phosphorylation of the nucleosome DNA entry-exit region improves access to DNA binding complexes, and the combination of phosphorylation and acetylation has the ability to alter DNA accessibility to transcription regulatory complexes dramatically.