5J9I

Crystal structure of the HigA2 antitoxin C-terminal domain

External Resource: Annotation

Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D	HTH_3	e5j9iD1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: HTH_3	ECOD (1.6)
F	HTH_3	e5j9iF1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: HTH_3	ECOD (1.6)
H	HTH_3	e5j9iH1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: HTH_3	ECOD (1.6)
A	HTH_3	e5j9iA1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: HTH_3	ECOD (1.6)
B	HTH_3	e5j9iB1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: HTH_3	ECOD (1.6)
C	HTH_3	e5j9iC1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: HTH_3	ECOD (1.6)
E	HTH_3	e5j9iE1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: HTH_3	ECOD (1.6)
G	HTH_3	e5j9iG1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: HTH_3	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D, E A, B, C, D, E, F, G, H	PF15731	Antitoxin component of bacterial toxin-antitoxin system, MqsA (MqsA_antitoxin)	Antitoxin component of bacterial toxin-antitoxin system, MqsA	MqsA_antitoxin is a family of prokaryotic proteins that act as antidotes to the mRNA interferase MqsR. It has a zinc-binding at the very N-terminus indicating its DNA-binding capacity. MqsR is the gene most highly upregulated in E. Colo MqsR_toxin i ...	MqsA_antitoxin is a family of prokaryotic proteins that act as antidotes to the mRNA interferase MqsR. It has a zinc-binding at the very N-terminus indicating its DNA-binding capacity. MqsR is the gene most highly upregulated in E. Colo MqsR_toxin is a family of bacterial toxins that act as an mRNA interferase. MqsR is the gene most highly upregulated in E. coli persister cells [2] and it plays an essential role in biofilm regulation [3] and cell signalling [4]. It forms part of a bacterial toxin-antitoxin TA system, and as expected for a TA system, the expression of the MqsR toxin leads to growth arrest, while co-expression with its antitoxin, MqsA, rescues the growth arrest phenotype. In addition, MqsR associates with MqsA to form a tight, non-toxic complex and both MqsA alone and the MqsR:MqsA2:MqsR complex bind and regulate the mqsR promoter. The structure of MqsR shows that is is a member of the RelE/YoeB family of bacterial RNases that are structurally and functionally characterised bacterial toxins [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D, E A, B, C, D, E, F, G, H	Antitoxin igA-2	DNA binding binding organic cyclic compound binding nucleic acid binding	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D, E A, B, C, D, E, F, G, H	IPR032758	Antitoxin MqsA/HigA-2	Family
A, B, C, D, E A, B, C, D, E, F, G, H	IPR001387	Cro/C1-type helix-turn-helix domain	Domain
A, B, C, D, E A, B, C, D, E, F, G, H	IPR010982	Lambda repressor-like, 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.