Annotations: 1X75

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
D	d1x75d_	All beta proteins	SH3-like barrel	Cell growth inhibitor/plasmid maintenance toxic component	CcdB	CcdB	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)
C	d1x75c_	All beta proteins	SH3-like barrel	Cell growth inhibitor/plasmid maintenance toxic component	CcdB	CcdB	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)
A	d1x75a1	Multi-domain proteins (alpha and beta)	Type II DNA topoisomerase C-terminal domain-like	Type II DNA topoisomerase C-terminal domain-like	Type II DNA topoisomerase C-terminal domain-like	DNA Gyrase A	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)
B	d1x75b_	Multi-domain proteins (alpha and beta)	Type II DNA topoisomerase C-terminal domain-like	Type II DNA topoisomerase C-terminal domain-like	Type II DNA topoisomerase C-terminal domain-like	DNA Gyrase A	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
D	SCOP2B Superfamily	Cell growth inhibitor/plasmid maintenance toxic component	8041673	3000352	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Cell growth inhibitor/plasmid maintenance toxic component	8041673	3000352	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)
D	KOW, Ribosomal_L26	e1x75D1	A: a/b three-layered sandwiches	X: Phage tail fiber protein trimerization domain	H: beta-Prism I	T: beta-Prism I	F: KOW, Ribosomal_L26	ECOD (v294.1)
C	KOW, Ribosomal_L26	e1x75C1	A: a/b three-layered sandwiches	X: Phage tail fiber protein trimerization domain	H: beta-Prism I	T: beta-Prism I	F: KOW, Ribosomal_L26	ECOD (v294.1)
A	DNA_topoisoIV	e1x75A1	A: a/b three-layered sandwiches	X: Cation-proton antiporter	H: Serralysin-like metalloprotease-C	T: Serralysin-like metalloprotease-C	F: DNA_topoisoIV	ECOD (v294.1)
B	Sigma_1_2	e1x75B1	A: a/b three-layered sandwiches	X: HTH	H: Nudix	T: winged helix domain	F: Sigma_1_2	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D	2.30.30.110	Mainly Beta	Roll	SH3 type barrels.		CATH (4.3.0)
C	2.30.30.110	Mainly Beta	Roll	SH3 type barrels.		CATH (4.3.0)
A	1.10.268.10	Mainly Alpha	Orthogonal Bundle	Topoisomerase	domain 3	CATH (4.3.0)
B	1.10.268.10	Mainly Alpha	Orthogonal Bundle	Topoisomerase	domain 3	CATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C, D	Cytotoxic protein ccdB	enzyme regulator activity molecular function inhibitor activity DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) inhibitor activity molecular function regulator activity enzyme inhibitor activity DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) regulator activity ATPase inhibitor activity	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 negative regulation of DNA-templated DNA replication DNA-templated DNA replication negative regulation of DNA replication DNA metabolic process DNA replication regulation of DNA-templated DNA replication negative regulation of DNA metabolic process regulation of DNA metabolic process regulation of DNA replication plasmid maintenance	protein-containing complex transcription regulator complex transcription repressor complex toxin-antitoxin complex
A, B	DNA gyrase subunit A	ATP-dependent activity, acting on DNA catalytic activity, acting on DNA catalytic activity, acting on a nucleic acid catalytic activity ATP-dependent activity binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding ATP-dependent activity, acting on DNA catalytic activity, acting on DNA catalytic activity, acting on a nucleic acid catalytic activity ATP-dependent activity binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding DNA binding nucleic acid binding nucleic acid conformation isomerase activity isomerase activity DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) activity DNA negative supercoiling activity DNA topoisomerase activity macromolecular conformation isomerase activity identical protein binding protein binding	response to stimulus response to chemical response to xenobiotic stimulus response to antibiotic nucleobase-containing compound metabolic process DNA-templated DNA replication DNA replication metabolic process cellular process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process chromosome organization response to stimulus response to chemical response to xenobiotic stimulus response to antibiotic nucleobase-containing compound metabolic process DNA-templated DNA replication DNA replication metabolic process cellular process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process chromosome organization DNA conformation change cellular component organization DNA topological change organelle organization cellular component organization or biogenesis RNA metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process RNA biosynthetic process DNA-templated transcription nucleic acid biosynthetic process biosynthetic process regulation of cellular process negative regulation of biological process regulation of primary metabolic process negative regulation of DNA-templated DNA replication negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process negative regulation of macromolecule metabolic process regulation of biological process negative regulation of DNA replication negative regulation of metabolic process biological regulation regulation of macromolecule metabolic process regulation of DNA-templated DNA replication negative regulation of DNA metabolic process regulation of metabolic process regulation of DNA metabolic process regulation of DNA replication	cellular anatomical structure membrane intracellular anatomical structure cytoplasm cytosol intracellular organelle organelle membraneless organelle intracellular membraneless organelle chromosome DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) complex protein-containing complex catalytic complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C, D	IPR011067	Plasmid maintenance toxin/Cell growth inhibitor	Homologous Superfamily
C, D	IPR002712	Toxin CcdB	Family
A, B	IPR035516	DNA gyrase/topoisomerase IV, subunit A, C-terminal	Homologous Superfamily
A, B	IPR050220	Type II DNA Topoisomerases	Family
A, B	IPR013760	DNA topoisomerase, type IIA-like domain superfamily	Homologous Superfamily
A, B	IPR013758	DNA topoisomerase, type IIA, domain A, alpha-beta	Homologous Superfamily
A, B	IPR006691	DNA gyrase/topoisomerase IV, subunit A, C-terminal repeat	Repeat
A, B	IPR013757	DNA topoisomerase, type IIA, alpha-helical domain superfamily	Homologous Superfamily
A, B	IPR005743	DNA gyrase, subunit A	Family
A, B	IPR002205	DNA topoisomerase, type IIA, domain A	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.