Annotations: 7XQ5

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	HLH	e7xq5B1	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: HLH	ECOD (1.6)
A	HLH	e7xq5A1	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: HLH	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B	PF23179	INO2 bHLH domain (bHLH_INO2)	INO2 bHLH domain	The founding member of this family is the bHLH domain of yeast protein INO2. This protein is a positive regulatory factor involved in the transcriptional regulation of phospholipid biosynthetic genes. INO2 forms a heterodimer with INO4 and this compl ...	The founding member of this family is the bHLH domain of yeast protein INO2. This protein is a positive regulatory factor involved in the transcriptional regulation of phospholipid biosynthetic genes. INO2 forms a heterodimer with INO4 and this complex specifically recognizes the inositol/choline-responsive element, followed by the transcription activation of the phospholipid biosynthetic gene. Ternary INO2(bHLH)/INO4(bHLH)/DNA complex showed that the recognition and binding of promoter DNA is mediated by the presence of both protein domains [1].	Domain
A	PF23181	INO4 bHLH domain (bHLH_INO4)	INO4 bHLH domain	The founding member of this family is the bHLH domain of yeast protein INO4. This protein is a positive regulatory factor involved in the transcriptional regulation of phospholipid biosynthetic genes. INO4 forms a heterodimer with INO2 and this compl ...	The founding member of this family is the bHLH domain of yeast protein INO4. This protein is a positive regulatory factor involved in the transcriptional regulation of phospholipid biosynthetic genes. INO4 forms a heterodimer with INO2 and this complex specifically recognizes the inositol/choline-responsive element, followed by the transcription activation of the phospholipid biosynthetic gene. Ternary INO2(bHLH)/INO4(bHLH)/DNA complex showed that the recognition and binding of promoter DNA is mediated by the presence of both protein domains [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D	DNA (5'-D(GPAPTPTPTPTPCPAPCPAPTPGPCPAP*G)-3')	-	-	-
C	DNA (5'-D(PCPCPTPGPCPAPTPGPTPGPAPAPAPAP*T)-3')	-	-	-
B	Protein INO2	DNA binding binding nucleic acid binding protein binding protein dimerization activity	lipid biosynthetic process primary metabolic process phospholipid biosynthetic process phospholipid metabolic process biosynthetic process organophosphate metabolic process organophosphate biosynthetic process phosphate-containing compound metabolic process metabolic process cellular process phosphorus metabolic process lipid metabolic process regulation of cellular process positive regulation of DNA-templated transcription lipid biosynthetic process primary metabolic process phospholipid biosynthetic process phospholipid metabolic process biosynthetic process organophosphate metabolic process organophosphate biosynthetic process phosphate-containing compound metabolic process metabolic process cellular process phosphorus metabolic process lipid metabolic process regulation of cellular process positive regulation of DNA-templated transcription positive regulation of biological process RNA metabolic process positive regulation of macromolecule biosynthetic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process positive regulation of metabolic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase II positive regulation of biosynthetic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process positive regulation of cellular process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of transcription by RNA polymerase II regulation of biological process biological regulation regulation of macromolecule metabolic process positive regulation of transcription by RNA polymerase II nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process positive regulation of RNA metabolic process regulation of gene expression positive regulation of RNA biosynthetic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription regulation of metabolic process	RNA polymerase II transcription regulator complex membrane-bounded organelle protein-containing complex intracellular anatomical structure nucleus nuclear protein-containing complex transcription regulator complex intracellular membrane-bounded organelle intracellular organelle cellular anatomical structure organelle
A	Protein INO4	DNA binding binding nucleic acid binding protein binding protein dimerization activity	lipid biosynthetic process primary metabolic process phospholipid biosynthetic process phospholipid metabolic process biosynthetic process organophosphate metabolic process organophosphate biosynthetic process phosphate-containing compound metabolic process metabolic process cellular process phosphorus metabolic process lipid metabolic process regulation of cellular process positive regulation of DNA-templated transcription lipid biosynthetic process primary metabolic process phospholipid biosynthetic process phospholipid metabolic process biosynthetic process organophosphate metabolic process organophosphate biosynthetic process phosphate-containing compound metabolic process metabolic process cellular process phosphorus metabolic process lipid metabolic process regulation of cellular process positive regulation of DNA-templated transcription positive regulation of biological process RNA metabolic process positive regulation of macromolecule biosynthetic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process positive regulation of metabolic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase II positive regulation of biosynthetic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process positive regulation of cellular process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of transcription by RNA polymerase II regulation of biological process biological regulation regulation of macromolecule metabolic process positive regulation of transcription by RNA polymerase II nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process positive regulation of RNA metabolic process regulation of gene expression positive regulation of RNA biosynthetic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription regulation of metabolic process	RNA polymerase II transcription regulator complex membrane-bounded organelle protein-containing complex intracellular anatomical structure nucleus nuclear protein-containing complex transcription regulator complex intracellular membrane-bounded organelle intracellular organelle cellular anatomical structure organelle

InterPro: Protein Family Classification InterPro Database Homepage

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

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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.