Annotations: 1HST

Domain Annotation: SCOP/SCOPe Classification SCOP Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1hsta_	All alpha proteins	DNA/RNA-binding 3-helical bundle	'Winged helix' DNA-binding domain	Linker histone H1/H5	Histone H5, globular domain	chicken (Gallus gallus ) [TaxId: 9031 ],	SCOPe (2.08)
B	d1hstb_	All alpha proteins	DNA/RNA-binding 3-helical bundle	'Winged helix' DNA-binding domain	Linker histone H1/H5	Histone H5, globular domain	chicken (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	SCOP2 Family	Linker histone H1/H5 globular domain-like	8002930	4000178	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Winged helix DNA-binding domain	8002931	3000034	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	Winged helix DNA-binding domain	8002931	3000034	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	Linker_histone	e1hstA1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: Linker_histone	ECOD (1.6)
B	Linker_histone	e1hstB1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: Linker_histone	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.10.10	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain	CATH (4.3.0)
B	1.10.10.10	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00538	linker histone H1 and H5 family (Linker_histone)	linker histone H1 and H5 family	Linker histone H1 is an essential component of chromatin structure. H1 links nucleosomes into higher order structures Histone H1 is replaced by histone H5 in some cell types.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	HISTONE H5	DNA binding double-stranded DNA binding binding organic cyclic compound binding nucleic acid binding protein-containing complex binding chromatin binding nucleosome binding nucleosomal DNA binding chromatin DNA binding 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 organelle organization 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 organelle organization chromosome condensation chromosome organization regulation of DNA recombination regulation of cellular process negative regulation of biological process negative regulation of nitrogen compound metabolic process negative regulation of cellular metabolic process regulation of primary metabolic process regulation of nitrogen compound metabolic process nucleobase-containing compound metabolic process organic substance metabolic process heterocycle metabolic process negative regulation of cellular process nitrogen compound metabolic process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process negative regulation of macromolecule metabolic process regulation of biological process negative regulation of metabolic process cellular metabolic process DNA recombination biological regulation cellular nitrogen compound metabolic process primary metabolic process regulation of cellular metabolic process regulation of macromolecule metabolic process DNA metabolic process nucleic acid metabolic process negative regulation of DNA recombination organic cyclic compound metabolic process negative regulation of DNA metabolic process metabolic process macromolecule metabolic process regulation of metabolic process cellular aromatic compound metabolic process regulation of DNA 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

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR036388	Winged helix-like DNA-binding domain superfamily	Homologous Superfamily
A, B	IPR036390	Winged helix DNA-binding domain superfamily	Homologous Superfamily
A, B	IPR005818	Linker histone H1/H5, domain H15	Domain
A, B	IPR005819	Linker histone H1/H5	Family

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.