Annotations: 2K1N

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
F [auth D]	SCOP2B Superfamily	AbrB/MazE/MraZ-like	8034352	3000181	SCOP2B (2022-06-29)
E [auth C]	SCOP2B Superfamily	AbrB/MazE/MraZ-like	8034352	3000181	SCOP2B (2022-06-29)
D [auth B]	SCOP2B Superfamily	AbrB/MazE/MraZ-like	8034352	3000181	SCOP2B (2022-06-29)
C [auth A]	SCOP2B Superfamily	AbrB/MazE/MraZ-like	8034352	3000181	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)
F [auth D]	MazE_antitoxin	e2k1nD1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: AbrB	F: MazE_antitoxin	ECOD (1.6)
E [auth C]	MazE_antitoxin	e2k1nC1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: AbrB	F: MazE_antitoxin	ECOD (1.6)
D [auth B]	MazE_antitoxin	e2k1nB1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: AbrB	F: MazE_antitoxin	ECOD (1.6)
C [auth A]	MazE_antitoxin	e2k1nA1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: AbrB	F: MazE_antitoxin	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
F [auth D]	2.10.260.10	Mainly Beta	Ribbon	Pemi-like Protein 1	Chain: D	CATH (4.2.0)
E [auth C]	2.10.260.10	Mainly Beta	Ribbon	Pemi-like Protein 1	Chain: D	CATH (4.2.0)
D [auth B]	2.10.260.10	Mainly Beta	Ribbon	Pemi-like Protein 1	Chain: D	CATH (4.2.0)
C [auth A]	2.10.260.10	Mainly Beta	Ribbon	Pemi-like Protein 1	Chain: D	CATH (4.2.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth A], D [auth B], E [auth C], F [auth D]	PF04014	Antidote-toxin recognition MazE, bacterial antitoxin (MazE_antitoxin)	Antidote-toxin recognition MazE, bacterial antitoxin	AbrB-like is a family of small proteins that operate in conjunction with a cognate toxin molecule. The commonly attributed role of toxin-antitoxin systems is to maintain low-copy number plasmids from one generation to the next. Such gene-pairs are al ...	AbrB-like is a family of small proteins that operate in conjunction with a cognate toxin molecule. The commonly attributed role of toxin-antitoxin systems is to maintain low-copy number plasmids from one generation to the next. Such gene-pairs are also found on chromosomes and to be associated with a number of biological functions such as: reduction of protein synthesis, gene regulation and retardation of cell growth under nutritional stress [1]. This family includes proteins from a number of different pairings, eg MazE, AbrB, VapB [2], PhoU, PemI-like and SpoVT. MazE is the antidote to the toxin MazF of E. coli. MazE-MazF in E. coli is a regulated prokaryotic chromosomal addiction module. MazE antidote is degraded by the ClpPA protease of the bacterial proteasome. MazE-MazF is thought to play a role in programmed cell death when cells suffer nutrient deprivation [3], and MazE-MazF modules have also been implicated in the bacteriostatic effects of other addiction modules [3].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth E]	DNA (25-MER)	-	-	-
B [auth F]	DNA (25-MER)	-	-	-
C [auth A], D [auth B], E [auth C], F [auth D]	AbrB family transcriptional regulator	DNA binding binding nucleic acid binding identical protein binding protein binding	regulation of cellular process negative regulation of biological process RNA metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process regulation of RNA metabolic process negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of cellular process negative regulation of biological process RNA metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process regulation of RNA metabolic process negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process negative regulation of macromolecule metabolic process regulation of biosynthetic process negative regulation of DNA-templated transcription regulation of biological process negative regulation of metabolic 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 negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process metabolic process cellular process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription regulation of metabolic process negative regulation of RNA metabolic process developmental process regulation of developmental process sporulation regulation of sporulation sporulation resulting in formation of a cellular spore anatomical structure morphogenesis anatomical structure formation involved in morphogenesis anatomical structure development	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth A], D [auth B], E [auth C], F [auth D]	IPR052731	Bacillus subtilis Transition State Regulators	Family
C [auth A], D [auth B], E [auth C], F [auth D]	IPR037914	SpoVT-AbrB domain superfamily	Homologous Superfamily
C [auth A], D [auth B], E [auth C], F [auth D]	IPR040678	AbrB, C-terminal	Domain
C [auth A], D [auth B], E [auth C], F [auth D]	IPR007159	SpoVT-AbrB domain	Domain

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.