Annotations: 1HIO

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1hioa_	All alpha proteins	Histone-fold	Histone-fold	Nucleosome core histones	Histone H2A	(Gallus gallus ) [TaxId: 9031 ],	SCOPe (2.08)
B	d1hiob_	All alpha proteins	Histone-fold	Histone-fold	Nucleosome core histones	Histone H2B	(Gallus gallus ) [TaxId: 9031 ],	SCOPe (2.08)
C	d1hioc_	All alpha proteins	Histone-fold	Histone-fold	Nucleosome core histones	Histone H3	(Gallus gallus ) [TaxId: 9031 ],	SCOPe (2.08)
D	d1hiod_	All alpha proteins	Histone-fold	Histone-fold	Nucleosome core histones	Histone H4	(Gallus gallus ) [TaxId: 9031 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Core histone-like	8040591	3001387	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Core histone-like	8040592	3001387	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Core histone-like	8040595	3001387	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Core histone-like	8040598	3001387	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Histone_1	e1hioA1	A: alpha arrays	X: Histone-like	H: Histone-related	T: Histone	F: Histone_1	ECOD (1.6)
B	Histone	e1hioB1	A: alpha arrays	X: Histone-like	H: Histone-related	T: Histone	F: Histone	ECOD (1.6)
C	Histone	e1hioC1	A: alpha arrays	X: Histone-like	H: Histone-related	T: Histone	F: Histone	ECOD (1.6)
D	Histone_1	e1hioD1	A: alpha arrays	X: Histone-like	H: Histone-related	T: Histone	F: Histone_1	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF16211	C-terminus of histone H2A (Histone_H2A_C)	C-terminus of histone H2A	-	Family
A	PF00125	Core histone H2A/H2B/H3/H4 (Histone)	Core histone H2A/H2B/H3/H4	-	Domain
B	PF00125	Core histone H2A/H2B/H3/H4 (Histone)	Core histone H2A/H2B/H3/H4	-	Domain
C	PF00125	Core histone H2A/H2B/H3/H4 (Histone)	Core histone H2A/H2B/H3/H4	-	Domain
D	PF15511	Centromere kinetochore component CENP-T histone fold (CENP-T_C)	Centromere kinetochore component CENP-T histone fold	CENP-T is a family of vertebral kinetochore proteins that associates directly with CENP-W. The N-terminus of CENP-T proteins interacts directly with the Ndc80 complex in the outer kinetochore. Importantly, the CENP-T-W complex does not directly asso ...	CENP-T is a family of vertebral kinetochore proteins that associates directly with CENP-W. The N-terminus of CENP-T proteins interacts directly with the Ndc80 complex in the outer kinetochore. Importantly, the CENP-T-W complex does not directly associate with CENP-A, but with histone H3 in the centromere region. CENP-T and -W form a hetero-tetramer with CENP-S and -X and bind to a ~100 bp region of nucleosome-free DNA forming a nucleosome-like structure. The DNA-CENP-T-W-S-X complex is likely to be associated with histone H3-containing nucleosomes rather than with CENP-nucleosomes. This domain is the C-terminal histone fold domain of CENP-T, which associates with chromatin [2-3].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	HISTONE H2A	DNA binding protein-containing complex binding binding chromatin binding organic cyclic compound binding nucleic acid binding nucleosome binding nucleosomal DNA binding chromatin DNA binding protein heterodimerization activity protein binding protein dimerization activity structural molecule activity structural constituent of chromatin	regulation of cellular process cellular biosynthetic process negative regulation of biological process negative regulation of cellular metabolic process cellular component organization chromatin organization negative regulation of cellular process chromatin remodeling cellular component organization or biogenesis negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of biological process heterochromatin formation epigenetic regulation of gene expression regulation of cellular process cellular biosynthetic process negative regulation of biological process negative regulation of cellular metabolic process cellular component organization chromatin organization negative regulation of cellular process chromatin remodeling cellular component organization or biogenesis negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of biological process heterochromatin formation epigenetic regulation of gene expression cellular metabolic process negative regulation of metabolic process biological regulation regulation of cellular metabolic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process negative regulation of cellular biosynthetic process regulation of cellular biosynthetic process regulation of gene expression negative regulation of gene expression biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process negative regulation of gene expression, epigenetic regulation of macromolecule biosynthetic process metabolic process cellular process macromolecule metabolic process regulation of metabolic process	protein-containing complex intracellular anatomical structure protein-DNA complex nucleosome chromatin chromosome cellular anatomical entity intracellular organelle organelle intracellular non-membrane-bounded organelle non-membrane-bounded organelle membrane-bounded organelle nucleus intracellular membrane-bounded organelle
B	HISTONE H2B	DNA binding binding organic cyclic compound binding nucleic acid binding protein heterodimerization activity protein binding protein dimerization activity protein-containing complex binding structural molecule activity structural constituent of chromatin	-	protein-containing complex intracellular anatomical structure protein-DNA complex nucleosome chromatin chromosome cellular anatomical entity intracellular organelle organelle intracellular non-membrane-bounded organelle non-membrane-bounded organelle membrane-bounded organelle nucleus intracellular membrane-bounded organelle
C	HISTONE H3	DNA binding binding organic cyclic compound binding nucleic acid binding chromatin binding protein heterodimerization activity protein binding protein dimerization activity structural molecule activity structural constituent of chromatin	biosynthetic process cellular biosynthetic process cellular metabolic process metabolic process cellular process macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of cellular process negative regulation of biological process RNA metabolic process negative regulation of cellular metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process biosynthetic process cellular biosynthetic process cellular metabolic process metabolic process cellular process macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of cellular process negative regulation of biological process RNA metabolic process negative regulation of cellular metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process regulation of RNA metabolic process transcription by RNA polymerase II negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of transcription by RNA polymerase II negative regulation of DNA-templated transcription regulation of biological process negative regulation of transcription by RNA polymerase II negative regulation of metabolic process biological regulation primary metabolic process regulation of cellular metabolic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process nucleic acid metabolic process negative regulation of cellular biosynthetic process regulation of cellular biosynthetic process regulation of gene expression negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process regulation of macromolecule biosynthetic process regulation of DNA-templated transcription regulation of metabolic process negative regulation of RNA metabolic process	protein-containing complex intracellular anatomical structure protein-DNA complex nucleosome chromatin chromosome cellular anatomical entity intracellular organelle organelle intracellular non-membrane-bounded organelle non-membrane-bounded organelle membrane-bounded organelle nucleus intracellular membrane-bounded organelle
D	HISTONE H4	DNA binding binding organic cyclic compound binding nucleic acid binding protein heterodimerization activity protein binding protein dimerization activity structural molecule activity structural constituent of chromatin	protein-containing complex organization protein-DNA complex assembly cellular component organization protein-DNA complex organization cellular component biogenesis cellular component assembly chromatin organization protein-containing complex assembly chromatin remodeling cellular process cellular component organization or biogenesis nucleosome assembly nucleosome organization	protein-containing complex intracellular anatomical structure protein-DNA complex nucleosome chromatin chromosome cellular anatomical entity intracellular organelle organelle intracellular non-membrane-bounded organelle non-membrane-bounded organelle membrane-bounded organelle nucleus membrane-enclosed lumen protein-containing complex intracellular anatomical structure protein-DNA complex nucleosome chromatin chromosome cellular anatomical entity intracellular organelle organelle intracellular non-membrane-bounded organelle non-membrane-bounded organelle membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR009072	Histone-fold	Homologous Superfamily
A	IPR007125	Histone H2A/H2B/H3	Domain
A	IPR002119	Histone H2A	Family
A	IPR032454	Histone H2A, C-terminal domain	Domain
A	IPR032458	Histone H2A conserved site	Conserved Site
B	IPR009072	Histone-fold	Homologous Superfamily
B	IPR007125	Histone H2A/H2B/H3	Domain
B	IPR000558	Histone H2B	Family
C	IPR009072	Histone-fold	Homologous Superfamily
C	IPR007125	Histone H2A/H2B/H3	Domain
C	IPR000164	Histone H3/CENP-A	Family
D	IPR009072	Histone-fold	Homologous Superfamily
D	IPR001951	Histone H4	Family
D	IPR035425	CENP-T/Histone H4, histone fold	Domain
D	IPR019809	Histone H4, conserved site	Conserved Site
D	IPR004823	TATA box binding protein associated factor (TAF), histone-like fold domain	Domain

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.