FEATURES

FAMILY

DESCRIPTION

Also known as H33_HUMAN, H3-3A, H3-3B, H3.3A, H3F3, H3F3A, H3.3B, H3F3B. Variant histone H3 which replaces conventional H3 in a wide range of nucleosomes in active genes. Constitutes the predominant form of histone H3 in non-dividing cells and is incorporated into chromatin independently of DNA synthesis. Deposited at sites of nucleosomal displacement throughout transcribed genes, suggesting that it represents an epigenetic imprint of transcriptionally active chromatin. Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template. Histones thereby 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. The nucleosome is a histone octamer containing two molecules each of H2A, H2B, H3 and H4 assembled in one H3-H4 heterotetramer and two H2A-H2B heterodimers. The octamer wraps approximately 147 bp of DNA. Interacts with HIRA, a chaperone required for its incorporation into nucleosomes. Interacts with ZMYND11; when trimethylated at 'Lys-36' (H3.3K36me3). Found in a co-chaperone complex with DNJC9, MCM2 and histone H3.3-H4 dimers (PubMed:33857403). Within the complex, interacts with DNJC9 (via C-terminus); the interaction is direct (PubMed:33857403). Interacts with ASF1A, MCM2, NASP and SPT2 (PubMed:33857403). Interacts with DAXX; the interaction is direct (PubMed:20504901 and PubMed:34876591).

Also known as H33_HUMAN, H3-3A, H3-3B, H3.3A, H3F3, H3F3A, H3.3B, H3F3B. Variant histone H3 which replaces conventional H3 in a wide range of nucleosomes in active genes. Constitutes the predomi ...

EXTERNAL LINKS

H3-3A, H3-3B

Histone H3.3

H3-3A, H3-3B

Molecular Synopsis