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

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyType II DNA topoisomerase half-clamp domain-like 8025176 4002825 SCOP2 (2022-06-29)
ASCOP2 FamilyToprim C-terminal associated domain-like 8055744 4007653 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyType II DNA topoisomerase half-clamp domain-like 8037555 3001800 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyWinged helix DNA-binding domain 8055745 3000034 SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ADNA_topoisoIV_1ste1ab4A1 A: alpha arraysX: HTHH: HTHT: wingedF: DNA_topoisoIV_1stECOD (1.6)
ADNA_topoisoIV_3rde1ab4A2 A: alpha bundlesX: alpha-helical domain in type II DNA topoisomerase (From Topology)H: alpha-helical domain in type II DNA topoisomerase (From Topology)T: alpha-helical domain in type II DNA topoisomeraseF: DNA_topoisoIV_3rdECOD (1.6)
ADNA_topoisoIV_2nd_1e1ab4A3 A: a+b two layersX: a+b domain in type II DNA topoisomerase (From Topology)H: a+b domain in type II DNA topoisomerase (From Topology)T: a+b domain in type II DNA topoisomeraseF: DNA_topoisoIV_2nd_1ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.90.199.10 Alpha Beta Alpha-Beta Complex Topoisomerase II domain 5CATH (4.3.0)
A3.30.1360.40 Alpha Beta 2-Layer Sandwich Gyrase A domain 2CATH (4.3.0)
A1.10.268.10 Mainly Alpha Orthogonal Bundle Topoisomerase domain 3CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF00521DNA gyrase/topoisomerase IV, subunit A (DNA_topoisoIV)DNA gyrase/topoisomerase IV, subunit A- Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
GYRASE A

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
DNA topoisomerase (ATP-hydrolysing)  M-CSA #745

E. coli DNA gyrase is a member of the family of type II topoisomerases, which change the topology of DNA by cleaving both the phosphodiester backbones of the double-stranded DNA, transporting another double-stranded segement through the enzyme bridged gap, and then religating the DNA. Therefore, E. coli DNA gyrase catalyses the relaxation of negatively supercoiled DNA, and is uniquely also able to introduce negative supercoils into DNA at the expense of ATP hydrolysis. By introducing a transient break into the DNA substrate, pasing another piece of DNA though the gap and releasing it, the enzyme relieves topological contraints caused by replication and transcription complexes moving along the DNA. The enzyme consists of 2 GyrA and 2 GyrB subunits. The catalytic domain is found on the GyrA subunit, whilst the ATP hydrolysis site is found on GyrB.

Defined by 3 residues: ARG:A-3 [auth A-32]HIS:A-49 [auth A-78]TYR:A_2-93 [auth A_2-122]
 | 
 
Explore in 3DM-CSA Motif Definition