2KZ8

Solution NMR structure of MqsA, a protein from E. coli, containing a Zinc finger, N-terminal and a Helix Turn-Helix 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)
A	HTH_3	e2kz8A1	A: alpha arrays	X: HTH	H: HTH	T: tetra-helical, lambda repressor-like	F: HTH_3	ECOD (1.6)
A	MqsA_antitoxin	e2kz8A2	A: few secondary structure elements	X: Rubredoxin-like	H: Rubredoxin-related	T: Rubredoxin-related	F: MqsA_antitoxin	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	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	Uncharacterized HTH-type transcriptional regulator ygiT	identical protein binding protein binding binding protein homodimerization activity protein dimerization activity sequence-specific DNA binding DNA binding nucleic acid binding cation binding ion binding metal ion binding small molecule binding	regulation of cellular 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 regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of biological process biological regulation primary metabolic process regulation of cellular 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 regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of biological process biological regulation primary metabolic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of gene expression biosynthetic process cellular process metabolic process regulation of macromolecule biosynthetic process regulation of DNA-templated transcription macromolecule metabolic process regulation of metabolic process cell aggregation biofilm formation biological process involved in intraspecies interaction between organisms single-species biofilm formation aggregation of unicellular organisms	protein-containing complex transcription regulator complex toxin-antitoxin complex transcription repressor complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR032758	Antitoxin MqsA/HigA-2	Family
A	IPR022453	Zinc finger, MqsA-type	Domain
A	IPR001387	Cro/C1-type helix-turn-helix domain	Domain
A	IPR052359	Bacterial HTH-type regulators and antitoxins	Family
A	IPR022452	Antitoxin MqsA	Family
A	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 R01GM157729.