Annotations: 5IFG

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF09907	e5ifgA1	A: a+b two layers	X: RelE-like	H: RelE-like (From Topology)	T: RelE-like	F: PF09907	ECOD (1.6)
C	PF09907	e5ifgC1	A: a+b two layers	X: RelE-like	H: RelE-like (From Topology)	T: RelE-like	F: PF09907	ECOD (1.6)
B	PF01381	e5ifgB2	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: PF01381	ECOD (1.6)
B	F_UNCLASSIFIED	e5ifgB1	A: alpha bundles	X: Bromodomain-like	H: PMT helical bundle domain-like	T: N-terminal domain of antitoxin HigA	F: F_UNCLASSIFIED	ECOD (1.6)
D	PF01381	e5ifgD2	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: PF01381	ECOD (1.6)
D	F_UNCLASSIFIED	e5ifgD1	A: alpha bundles	X: Bromodomain-like	H: PMT helical bundle domain-like	T: N-terminal domain of antitoxin HigA	F: F_UNCLASSIFIED	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, C	PF09907	HigB_toxin, RelE-like toxic component of a toxin-antitoxin system (HigB_toxin)	HigB_toxin, RelE-like toxic component of a toxin-antitoxin system	-	Family
B, D	PF01381	Helix-turn-helix (HTH_3)	Helix-turn-helix	This large family of DNA binding helix-turn helix proteins includes Cro Swiss:P03036 and CI Swiss:P03034. Within the protein Swiss:Q5F9C2, the full protein fold incorporates a helix-turn-helix motif, but the function of this member is unlikely to be ...	This large family of DNA binding helix-turn helix proteins includes Cro Swiss:P03036 and CI Swiss:P03034. Within the protein Swiss:Q5F9C2, the full protein fold incorporates a helix-turn-helix motif, but the function of this member is unlikely to be that of a DNA-binding regulator, the function of most other members, so is not necessarily characteristic of the whole family [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C	mRNA interferase HigB	endonuclease activity nuclease activity hydrolase activity, acting on ester bonds catalytic activity, acting on RNA RNA endonuclease activity catalytic activity, acting on a nucleic acid RNA nuclease activity hydrolase activity catalytic activity RNA binding binding organic cyclic compound binding nucleic acid binding	regulation of growth regulation of biological process biological regulation growth regulation of cellular process cellular biosynthetic process organonitrogen compound biosynthetic process negative regulation of biological process negative regulation of cellular metabolic process regulation of primary metabolic process post-transcriptional regulation of gene expression negative regulation of translation organic substance metabolic process organic substance biosynthetic process regulation of growth regulation of biological process biological regulation growth regulation of cellular process cellular biosynthetic process organonitrogen compound biosynthetic process negative regulation of biological process negative regulation of cellular metabolic process regulation of primary metabolic process post-transcriptional regulation of gene expression negative regulation of translation organic substance metabolic process organic substance biosynthetic process negative regulation of cellular process protein metabolic process negative regulation of protein metabolic process negative regulation of macromolecule metabolic process regulation of biosynthetic process organonitrogen compound metabolic process cellular metabolic process regulation of protein metabolic process negative regulation of metabolic process regulation of cellular metabolic process primary metabolic process regulation of macromolecule metabolic process gene expression translation macromolecule biosynthetic process negative regulation of cellular biosynthetic process regulation of cellular biosynthetic process regulation of gene expression negative regulation of gene expression biosynthetic process negative regulation of biosynthetic process regulation of translation negative regulation of macromolecule biosynthetic process regulation of macromolecule biosynthetic process metabolic process cellular process macromolecule metabolic process regulation of metabolic process nucleobase-containing compound metabolic process regulation of RNA metabolic process regulation of nucleobase-containing compound metabolic process regulation of biological quality RNA catabolic process mRNA catabolic process nucleobase-containing compound catabolic process organic cyclic compound metabolic process nucleic acid catabolic process catabolic process RNA metabolic process macromolecule catabolic process regulation of mRNA catabolic process regulation of catabolic process mRNA metabolic process nucleic acid metabolic process organic cyclic compound catabolic process regulation of mRNA stability regulation of RNA stability regulation of mRNA metabolic process organic substance catabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA biosynthetic process nucleobase-containing compound biosynthetic process organic cyclic compound biosynthetic process regulation of DNA-templated transcription	protein-containing complex transcription regulator complex toxin-antitoxin complex transcription repressor complex
B, D	Antitoxin HigA	DNA binding sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding binding double-stranded DNA binding organic cyclic compound binding core promoter sequence-specific DNA binding nucleic acid binding transcription regulatory region nucleic acid binding identical protein binding protein binding protein homodimerization activity protein dimerization activity	regulation of growth regulation of biological process biological regulation growth regulation of cellular process cellular biosynthetic process RNA metabolic process 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 regulation of growth regulation of biological process biological regulation growth regulation of cellular process cellular biosynthetic process RNA metabolic process 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 cellular metabolic process 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 organic cyclic compound metabolic process regulation of gene expression biosynthetic process organic cyclic compound biosynthetic process metabolic process regulation of macromolecule biosynthetic process cellular process regulation of DNA-templated transcription macromolecule metabolic process regulation of metabolic process	protein-containing complex transcription regulator complex toxin-antitoxin complex transcription repressor complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, C	IPR018669	Toxin-antitoxin system, mRNA interferase HigB	Family
B, D	IPR039060	Antitoxin HigA	Family
B, D	IPR001387	Cro/C1-type helix-turn-helix domain	Domain
B, D	IPR010982	Lambda repressor-like, 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 R01GM133198.