DNA gyrase subunit B (GyrB) is the ATPase subunit of DNA gyrase, which is a type II topoisomerase that negatively supercoils closed circular double-stranded (ds) DNA in an ATP-dependent manner to modulate DNA topology and maintain chromosomes in an underwound state; may be partial
DNA gyrase B subunit insert domain; This is the insert domain found in DNA gyrase B subunit ...
64-230
6.48e-66
DNA gyrase B subunit insert domain; This is the insert domain found in DNA gyrase B subunit proteins. Studies indicate that the insert has two functions, acting as a steric buttress to pre-configure the primary DNA-binding site, and serving as a relay that may help coordinate communication between different functional domains.
Pssm-ID: 465629 Cd Length: 167 Bit Score: 202.37 E-value: 6.48e-66
DNA gyrase, B subunit; This model describes the common type II DNA topoisomerase (DNA gyrase). ...
1-261
3.42e-29
DNA gyrase, B subunit; This model describes the common type II DNA topoisomerase (DNA gyrase). Two apparently independently arising families, one in the Proteobacteria and one in Gram-positive lineages, are both designated toposisomerase IV. Proteins scoring above the noise cutoff for this model and below the trusted cutoff for topoisomerase IV models probably should be designated GyrB. [DNA metabolism, DNA replication, recombination, and repair]
Pssm-ID: 273421 [Multi-domain] Cd Length: 654 Bit Score: 115.53 E-value: 3.42e-29
TOPRIM_TopoIIA_GyrB: topoisomerase-primase (TOPRIM) nucleotidyl transferase/hydrolase domain of the type found in proteins of the type IIA family of DNA topoisomerases similar to the Escherichia coli GyrB subunit. TopoIIA enzymes cut both strands of the duplex DNA to remove (relax) both positive and negative supercoils in DNA. These enzymes covalently attach to the 5' ends of the cut DNA, separate the free ends of the cleaved strands, pass another region of the duplex through this gap, then rejoin the ends. These proteins also catenate/ decatenate duplex rings. DNA gyrase is more effective at relaxing supercoils than decatentating DNA. DNA gyrase in addition inserts negative supercoils in the presence of ATP. The TOPRIM domain has two conserved motifs, one of which centers at a conserved glutamate and the other one at two conserved aspartates (DxD). The conserved glutamate may act as a general base in strand joining and as a general acid in strand cleavage by topisomerases. The DXD motif may co-ordinate Mg2+, a cofactor required for full catalytic function.
Pssm-ID: 173786 [Multi-domain] Cd Length: 114 Bit Score: 75.00 E-value: 4.11e-17
DNA gyrase B subunit insert domain; This is the insert domain found in DNA gyrase B subunit ...
64-230
6.48e-66
DNA gyrase B subunit insert domain; This is the insert domain found in DNA gyrase B subunit proteins. Studies indicate that the insert has two functions, acting as a steric buttress to pre-configure the primary DNA-binding site, and serving as a relay that may help coordinate communication between different functional domains.
Pssm-ID: 465629 Cd Length: 167 Bit Score: 202.37 E-value: 6.48e-66
DNA gyrase, B subunit; This model describes the common type II DNA topoisomerase (DNA gyrase). ...
1-261
3.42e-29
DNA gyrase, B subunit; This model describes the common type II DNA topoisomerase (DNA gyrase). Two apparently independently arising families, one in the Proteobacteria and one in Gram-positive lineages, are both designated toposisomerase IV. Proteins scoring above the noise cutoff for this model and below the trusted cutoff for topoisomerase IV models probably should be designated GyrB. [DNA metabolism, DNA replication, recombination, and repair]
Pssm-ID: 273421 [Multi-domain] Cd Length: 654 Bit Score: 115.53 E-value: 3.42e-29
DNA gyrase B subunit, carboxyl terminus; The amino terminus of eukaryotic and prokaryotic DNA ...
231-261
4.79e-18
DNA gyrase B subunit, carboxyl terminus; The amino terminus of eukaryotic and prokaryotic DNA topoisomerase II are similar, but they have a different carboxyl terminus. The amino-terminal portion of the DNA gyrase B protein is thought to catalyze the ATP-dependent super-coiling of DNA. See pfam00204. The carboxyl-terminal end supports the complexation with the DNA gyrase A protein and the ATP-independent relaxation. This family also contains Topoisomerase IV. This is a bacterial enzyme that is closely related to DNA gyrase,.
Pssm-ID: 460016 [Multi-domain] Cd Length: 63 Bit Score: 75.88 E-value: 4.79e-18
TOPRIM_TopoIIA_GyrB: topoisomerase-primase (TOPRIM) nucleotidyl transferase/hydrolase domain of the type found in proteins of the type IIA family of DNA topoisomerases similar to the Escherichia coli GyrB subunit. TopoIIA enzymes cut both strands of the duplex DNA to remove (relax) both positive and negative supercoils in DNA. These enzymes covalently attach to the 5' ends of the cut DNA, separate the free ends of the cleaved strands, pass another region of the duplex through this gap, then rejoin the ends. These proteins also catenate/ decatenate duplex rings. DNA gyrase is more effective at relaxing supercoils than decatentating DNA. DNA gyrase in addition inserts negative supercoils in the presence of ATP. The TOPRIM domain has two conserved motifs, one of which centers at a conserved glutamate and the other one at two conserved aspartates (DxD). The conserved glutamate may act as a general base in strand joining and as a general acid in strand cleavage by topisomerases. The DXD motif may co-ordinate Mg2+, a cofactor required for full catalytic function.
Pssm-ID: 173786 [Multi-domain] Cd Length: 114 Bit Score: 75.00 E-value: 4.11e-17
TOPRIM_TopoIIA_like: topoisomerase-primase (TOPRIM) nucleotidyl transferase/hydrolase domain of the type found in proteins of the type IIA family of DNA topoisomerases similar to Saccharomyces cerevisiae Topoisomerase II. TopoIIA enzymes cut both strands of the duplex DNA to remove (relax) both positive and negative supercoils in DNA. These enzymes covalently attach to the 5' ends of the cut DNA, separate the free ends of the cleaved strands, pass another region of the duplex through this gap, then rejoin the ends. These proteins also catenate/ decatenate duplex rings. The TOPRIM domain has two conserved motifs, one of which centers at a conserved glutamate and the other one at two conserved aspartates (DxD). The conserved glutamate may act as a general base in strand joining and as a general acid in strand cleavage by topisomerases. The DXD motif may co-ordinate Mg2+, a cofactor required for full catalytic function.
Pssm-ID: 173780 [Multi-domain] Cd Length: 115 Bit Score: 68.69 E-value: 8.46e-15
DNA topoisomerase IV, B subunit, proteobacterial; Operationally, topoisomerase IV is a type II ...
227-261
2.02e-07
DNA topoisomerase IV, B subunit, proteobacterial; Operationally, topoisomerase IV is a type II topoisomerase required for the decatenation of chromosome segregation. Not every bacterium has both a topo II and a topo IV. The topo IV families of the Gram-positive bacteria and the Gram-negative bacteria appear not to represent a single clade among the type II topoisomerases, and are represented by separate models for this reason. This protein is active as an alpha(2)beta(2) heterotetramer. [DNA metabolism, DNA replication, recombination, and repair]
Pssm-ID: 130127 [Multi-domain] Cd Length: 625 Bit Score: 51.46 E-value: 2.02e-07
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
of the residues that compose this conserved feature have been mapped to the query sequence.
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