Annotations: 1AN4

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
C [auth A]	d1an4a1	All alpha proteins	HLH-like	HLH, helix-loop-helix DNA-binding domain	HLH, helix-loop-helix DNA-binding domain	Usf B/HLH domain	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
C [auth A]	d1an4a2	Artifacts	Tags	Tags	Tags	N-terminal Tags	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D [auth B]	d1an4b1	All alpha proteins	HLH-like	HLH, helix-loop-helix DNA-binding domain	HLH, helix-loop-helix DNA-binding domain	Usf B/HLH domain	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D [auth B]	d1an4b2	Artifacts	Tags	Tags	Tags	N-terminal Tags	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C [auth A]	SCOP2 Family	HLH helix-loop-helix DNA-binding domain	8024870	4000913	SCOP2 (2022-06-29)
C [auth A]	SCOP2 Superfamily	HLH helix-loop-helix DNA-binding domain	8037249	3001962	SCOP2 (2022-06-29)
D [auth B]	SCOP2B Superfamily	HLH helix-loop-helix DNA-binding domain	8037249	3001962	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)
C [auth A]	PF00010	e1an4A1	A: alpha duplicates or obligate multimers	X: HLH-like	H: HLH, helix-loop-helix DNA-binding domain (From Topology)	T: HLH, helix-loop-helix DNA-binding domain	F: PF00010	ECOD (1.6)
D [auth B]	PF00010	e1an4B1	A: alpha duplicates or obligate multimers	X: HLH-like	H: HLH, helix-loop-helix DNA-binding domain (From Topology)	T: HLH, helix-loop-helix DNA-binding domain	F: PF00010	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C [auth A]	4.10.280.10	Few Secondary Structures	Irregular	MYOD Basic-Helix-Loop-Helix Domain, subunit B	Helix-loop-helix DNA-binding domain	CATH (4.3.0)
D [auth B]	4.10.280.10	Few Secondary Structures	Irregular	MYOD Basic-Helix-Loop-Helix Domain, subunit B	Helix-loop-helix DNA-binding domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth A], D [auth B]	PF00010	Helix-loop-helix DNA-binding domain (HLH)	Helix-loop-helix DNA-binding domain	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B [auth D]	DNA (5'-D(GPTPGPTPAPGPGPCPCPAPCPGPTPGPAPCPC PGPGPGP*T)-3')	-	-	-
A [auth C]	DNA (5'-D(CPAPCPCPCPGPGPTPCPAPCPGPTPGPGPCPC PTPAPCP*A)-3')	-	-	-
C [auth A], D [auth B]	PROTEIN (UPSTREAM STIMULATORY FACTOR)	histone deacetylase binding protein binding binding enzyme binding DNA binding sequence-specific DNA binding double-stranded DNA binding nucleic acid binding RNA polymerase II transcription regulatory region sequence-specific DNA binding cis-regulatory region sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding organic cyclic compound binding transcription regulatory region nucleic acid binding histone deacetylase binding protein binding binding enzyme binding DNA binding sequence-specific DNA binding double-stranded DNA binding nucleic acid binding RNA polymerase II transcription regulatory region sequence-specific DNA binding cis-regulatory region sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding organic cyclic compound binding transcription regulatory region nucleic acid binding RNA polymerase II cis-regulatory region sequence-specific DNA binding protein heterodimerization activity protein dimerization activity DNA-binding transcription factor activity, RNA polymerase II-specific transcription regulator activity DNA-binding transcription factor activity identical protein binding protein homodimerization activity kinase binding protein kinase binding protein-containing complex binding transcription factor binding bHLH transcription factor binding DNA-binding transcription factor binding	viral gene expression late viral transcription viral process viral transcription chemical homeostasis homeostatic process lipid homeostasis cellular response to stimulus response to nutrient levels regulation of cellular process response to stimulus cellular biosynthetic process RNA metabolic process carbon catabolite regulation of transcription viral gene expression late viral transcription viral process viral transcription chemical homeostasis homeostatic process lipid homeostasis cellular response to stimulus response to nutrient levels regulation of cellular process response to stimulus cellular biosynthetic process RNA metabolic process carbon catabolite regulation of transcription regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process organic substance metabolic process organic substance biosynthetic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of biological process cellular metabolic process response to nutrient biological regulation primary metabolic process regulation of cellular metabolic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of cellular biosynthetic process cellular response to nutrient levels organic cyclic compound metabolic process regulation of gene expression cellular response to chemical stimulus biosynthetic process response to chemical organic cyclic compound biosynthetic process cellular response to nutrient cellular process metabolic process regulation of macromolecule biosynthetic process regulation of DNA-templated transcription macromolecule metabolic process regulation of metabolic process multicellular organismal process regulation of body fluid levels positive regulation of coagulation regulation of response to external stimulus positive regulation of biological process negative regulation of biological process positive regulation of blood coagulation regulation of response to wounding regulation of coagulation positive regulation of response to stimulus positive regulation of response to external stimulus response to stress regulation of response to stress coagulation regulation of multicellular organismal process positive regulation of hemostasis regulation of biological quality response to wounding regulation of hemostasis positive regulation of response to wounding wound healing negative regulation of response to stimulus regulation of blood coagulation negative regulation of wound healing hemostasis negative regulation of blood coagulation response to external stimulus negative regulation of response to wounding blood coagulation negative regulation of hemostasis positive regulation of wound healing fibrinolysis regulation of fibrinolysis negative regulation of coagulation regulation of response to stimulus negative regulation of response to external stimulus regulation of wound healing positive regulation of multicellular organismal process negative regulation of multicellular organismal process negative regulation of fibrinolysis response to light stimulus response to radiation response to abiotic stimulus response to UV response to decreased oxygen levels response to hypoxia response to oxygen levels regulation of transcription from RNA polymerase II promoter by glucose positive regulation of macromolecule biosynthetic process positive regulation of metabolic process transcription by RNA polymerase II positive regulation of transcription by glucose positive regulation of macromolecule metabolic process regulation of transcription by RNA polymerase II positive regulation of nucleobase-containing compound metabolic process positive regulation of transcription by RNA polymerase II positive regulation of RNA metabolic process carbon catabolite regulation of transcription from RNA polymerase II promoter carbon catabolite activation of transcription from RNA polymerase II promoter carbon catabolite activation of transcription positive regulation of DNA-templated transcription positive regulation of cellular metabolic process positive regulation of transcription from RNA polymerase II promoter by glucose positive regulation of biosynthetic process positive regulation of cellular process positive regulation of RNA biosynthetic process regulation of transcription by glucose positive regulation of cellular biosynthetic process cellular response to nitrogen compound response to organic substance response to endogenous stimulus response to organonitrogen compound response to peptide hormone response to oxygen-containing compound cellular response to peptide hormone stimulus response to nitrogen compound cellular response to oxygen-containing compound cellular response to endogenous stimulus cellular response to organonitrogen compound response to hormone response to insulin cellular response to organic substance cellular response to insulin stimulus cellular response to hormone stimulus glucose homeostasis carbohydrate homeostasis	protein-containing complex transcription regulator complex membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membrane-bounded organelle cellular anatomical entity intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen protein-containing complex transcription regulator complex membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membrane-bounded organelle cellular anatomical entity intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen protein-DNA complex intracellular non-membrane-bounded organelle chromatin chromosome non-membrane-bounded organelle Golgi apparatus cytoplasm endomembrane system

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth A], D [auth B]	IPR011598	Myc-type, basic helix-loop-helix (bHLH) domain	Domain
C [auth A], D [auth B]	IPR036638	Helix-loop-helix DNA-binding domain superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C [auth A], D [auth B]	Pharos: P22415	atypical teratoid rhabdoid tumor hyperlipidemia, combined, 1 malignant glioma familial combined hyperlipidemia oligodendroglioma glioblastoma large cell medulloblastoma

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.