UniProt:P62801 H4-I

chain
  • initiator methionine:1
  • chain:2-103
checksum A9E5DFD3F8B97598
comment
  • FUNCTION Core component of nucleosome. 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.SUBUNIT 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.SUBCELLULAR LOCATION Acetylation at Lys-6 (H4K5ac), Lys-9 (H4K8ac), Lys-13 (H4K12ac) and Lys-17 (H4K16ac) occurs in coding regions of the genome but not in heterochromatin.PTM Citrullination at Arg-4 (H4R3ci) by PADI4 impairs methylation.PTM Monomethylation and asymmetric dimethylation at Arg-4 (H4R3me1 and H4R3me2a, respectively) by PRMT1 favors acetylation at Lys-9 (H4K8ac) and Lys-13 (H4K12ac). Demethylation is performed by JMJD6. Symmetric dimethylation on Arg-4 (H4R3me2s) by the PRDM1/PRMT5 complex may play a crucial role in the germ-cell lineage (By similarity).PTM Monomethylated, dimethylated or trimethylated at Lys-21 (H4K20me1, H4K20me2, H4K20me3). Monomethylation is performed by KMT5A/SET8. Trimethylation is performed by KMT5B and KMT5C and induces gene silencing. Monomethylated at Lys-13 (H4K12me1) by N6AMT1; H4K12me1 modification is present at the promoters of numerous genes encoding cell cycle regulators.PTM Acetyl-methylated at Lys-6 and Lys-13 (H4K5acme and H4K12acme, respectively), acetyl-methylation is an epigenetic mark of active chromatin associated with increased transcriptional initiation. Acetyl-methylation is formed by acetylation by EP300/p300 of lysine residues that are already monomethylated on the same side chain. H4K5acme and H4K12acme marks specifically bind BRD2.PTM Phosphorylated by PAK2 at Ser-48 (H4S47ph). This phosphorylation increases the association of H3.3-H4 with the histone chaperone HIRA, thus promoting nucleosome assembly of H3.3-H4 and inhibiting nucleosome assembly of H3.1-H4 (By similarity).PTM Ubiquitinated by the CUL4-DDB-RBX1 complex in response to ultraviolet irradiation. This may weaken the interaction between histones and DNA and facilitate DNA accessibility to repair proteins. Monoubiquitinated at Lys-92 of histone H4 (H4K91ub1) in response to DNA damage. The exact role of H4K91ub1 in DNA damage response is still unclear but it may function as a licensing signal for additional histone H4 post-translational modifications such as H4 Lys-21 methylation (H4K20me) (By similarity).PTM Sumoylated, which is associated with transcriptional repression.PTM Butyrylation of histones marks active promoters and competes with histone acetylation.PTM Glutarylation at Lys-92 (H4K91glu) destabilizes nucleosomes by promoting dissociation of the H2A-H2B dimers from nucleosomes.PTM Ufmylated; monofmylated by UFL1 at Lys-32 (H4K31Ufm1) in response to DNA damage.PTM Lactylated in macrophages by EP300/P300 by using lactoyl-CoA directly derived from endogenous or exogenous lactate, leading to stimulates gene transcription. Delactylated by SIRT3 at Lys-17 (H4K16la).SIMILARITY Belongs to the histone H4 family.
created [InstanceEdit:392885] Kanapin, AA, 2009-03-09 12:07:18
crossReference
databaseName UniProt
dbId 394700
description
  • recommendedName: Histone H4
displayName UniProt:P62801 H4-I
geneName
  • H4-I
  • H4-II
  • H4-III
  • H4-IV
  • H4-V
  • H4-VI
  • H4-VII
identifier P62801
isSequenceChanged false
keyword
  • 3D-structure
  • Acetylation
  • Chromosome
  • Citrullination
  • DNA-binding
  • Hydroxylation
  • Isopeptide bond
  • Methylation
  • Nucleosome core
  • Nucleus
  • Phosphoprotein
  • Reference proteome
  • Ubl conjugation
modified [InstanceEdit:9963647] Weiser, Joel, 2025-08-15
moleculeType Protein
name
  • H4-I
physicalEntity
referenceDatabase [ReferenceDatabase:2] UniProt
referenceGene
referenceTranscript
schemaClass ReferenceGeneProduct
secondaryIdentifier
  • H4_CHICK
  • P02304
  • P02305
sequenceLength 103
species [Species:49591] Gallus gallus
stId uniprot:P62801
url http://purl.uniprot.org/uniprot/P62801

Referrals

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