Annotations: 2HIO

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d2hioa_	All alpha proteins	Histone-fold	Histone-fold	Nucleosome core histones	Histone H2A	(Gallus gallus ) [TaxId: 9031 ],	SCOPe (2.08)
B	d2hiob_	All alpha proteins	Histone-fold	Histone-fold	Nucleosome core histones	Histone H2B	(Gallus gallus ) [TaxId: 9031 ],	SCOPe (2.08)
C	d2hioc_	All alpha proteins	Histone-fold	Histone-fold	Nucleosome core histones	Histone H3	(Gallus gallus ) [TaxId: 9031 ],	SCOPe (2.08)
D	d2hiod_	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	PF00125,PF16211	e2hioA1	A: alpha arrays	X: Histone-like	H: Histone-related	T: Histone	F: PF00125,PF16211	ECOD (1.6)
B	PF00125	e2hioB1	A: alpha arrays	X: Histone-like	H: Histone-related	T: Histone	F: PF00125	ECOD (1.6)
C	PF00125	e2hioC1	A: alpha arrays	X: Histone-like	H: Histone-related	T: Histone	F: PF00125	ECOD (1.6)
D	PF15511	e2hioD1	A: alpha arrays	X: Histone-like	H: Histone-related	T: Histone	F: PF15511	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.20.10	Mainly Alpha	Orthogonal Bundle	Histone, subunit A	Histone, subunit A	CATH (4.3.0)
B	1.10.20.10	Mainly Alpha	Orthogonal Bundle	Histone, subunit A	Histone, subunit A	CATH (4.3.0)
C	1.10.20.10	Mainly Alpha	Orthogonal Bundle	Histone, subunit A	Histone, subunit A	CATH (4.3.0)
D	1.10.20.10	Mainly Alpha	Orthogonal Bundle	Histone, subunit A	Histone, subunit A	CATH (4.3.0)

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

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	PROTEIN (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	protein-DNA complex organization cellular component organization protein-containing complex organization chromatin organization cellular process heterochromatin organization cellular component organization or biogenesis	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	PROTEIN (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	PROTEIN (HISTONE H3)	DNA binding binding organic cyclic compound binding nucleic acid binding protein-containing complex binding chromatin binding protein heterodimerization activity protein binding protein dimerization activity structural molecule activity structural constituent of chromatin	organic substance metabolic process biosynthetic process cellular biosynthetic process cellular metabolic process organic substance biosynthetic process metabolic process cellular process macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of cellular process negative regulation of biological process negative regulation of cellular metabolic process regulation of primary metabolic process organic substance metabolic process biosynthetic process cellular biosynthetic process cellular metabolic process organic substance biosynthetic process metabolic process cellular process macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of cellular process negative regulation of biological process negative regulation of cellular metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase II negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic 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 primary metabolic process regulation of cellular metabolic process negative regulation of cellular biosynthetic process organic cyclic compound metabolic process regulation of gene expression negative regulation of macromolecule biosynthetic process organic cyclic compound biosynthetic process regulation of macromolecule biosynthetic process regulation of DNA-templated transcription regulation of metabolic process negative regulation of RNA metabolic process RNA metabolic process RNA biosynthetic process nucleic acid biosynthetic process negative regulation of cellular process regulation of RNA biosynthetic process negative regulation of macromolecule metabolic process regulation of biosynthetic process biological regulation regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process nucleic acid metabolic process regulation of cellular biosynthetic process negative regulation of biosynthetic 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	PROTEIN (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 protein-DNA complex organization cellular component 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 R01GM133198.