Annotations: 1A0A

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
C [auth A]	d1a0aa_	All alpha proteins	HLH-like	HLH, helix-loop-helix DNA-binding domain	HLH, helix-loop-helix DNA-binding domain	Pho4 B/HLH domain	baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ],	SCOPe (2.08)
D [auth B]	d1a0ab_	All alpha proteins	HLH-like	HLH, helix-loop-helix DNA-binding domain	HLH, helix-loop-helix DNA-binding domain	Pho4 B/HLH domain	baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ],	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	8024871	4000913	SCOP2 (2022-06-29)
C [auth A]	SCOP2 Superfamily	HLH helix-loop-helix DNA-binding domain	8037250	3001962	SCOP2 (2022-06-29)
D [auth B]	SCOP2B Superfamily	HLH helix-loop-helix DNA-binding domain	8037250	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	e1a0aA1	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	e1a0aB1	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
A [auth C]	DNA (5'-D(CPTPCPAPCPAPCPGPTPGPGPGPAPCPTPAP*G )-3')	-	-	-
B [auth D]	DNA (5'-D(CPTPAPGPTPCPCPCPAPCPGPTPGPTPGPAP*G )-3')	-	-	-
C [auth A], D [auth B]	PROTEIN (PHOSPHATE SYSTEM POSITIVE REGULATORY PROTEIN PHO4)	transcription regulator activity DNA-binding transcription factor activity protein binding binding protein dimerization activity sequence-specific DNA binding DNA binding organic cyclic compound binding nucleic acid binding	regulation of biological process regulation of cellular process positive regulation of phosphorus metabolic process cellular metabolic process biological regulation positive regulation of biological process regulation of cellular metabolic process positive regulation of cellular metabolic process positive regulation of phosphate metabolic process positive regulation of metabolic process regulation of phosphate metabolic process phosphate-containing compound metabolic process regulation of phosphorus metabolic process metabolic process regulation of biological process regulation of cellular process positive regulation of phosphorus metabolic process cellular metabolic process biological regulation positive regulation of biological process regulation of cellular metabolic process positive regulation of cellular metabolic process positive regulation of phosphate metabolic process positive regulation of metabolic process regulation of phosphate metabolic process phosphate-containing compound metabolic process regulation of phosphorus metabolic process metabolic process cellular process phosphorus metabolic process regulation of metabolic process positive regulation of cellular process positive regulation of macromolecule biosynthetic process regulation of primary metabolic process nucleobase-containing compound metabolic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase II organic substance biosynthetic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process regulation of transcription by RNA polymerase II positive regulation of nucleobase-containing compound metabolic process primary metabolic process positive regulation of transcription by RNA polymerase II positive regulation of RNA metabolic process organic cyclic compound metabolic process regulation of gene expression biosynthetic process organic cyclic compound biosynthetic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription positive regulation of DNA-templated transcription cellular biosynthetic process RNA metabolic process RNA biosynthetic process nucleic acid biosynthetic process organic substance metabolic process positive regulation of biosynthetic process regulation of RNA biosynthetic process regulation of biosynthetic 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 positive regulation of RNA biosynthetic process positive regulation of cellular biosynthetic process cellular response to stimulus cellular response to nutrient levels response to nutrient levels cellular response to phosphate starvation response to stimulus cellular response to stress response to stress response to starvation cellular response to starvation protein-DNA complex organization cellular component organization protein-containing complex organization chromatin organization chromatin remodeling cellular component organization or biogenesis	intracellular anatomical structure cytoplasm cellular anatomical entity membrane-bounded organelle intracellular organelle organelle nucleus intracellular membrane-bounded organelle

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

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.