DNA Topoisomerase, subtype IA; DNA-binding, ATP-binding and catalytic domain of bacterial DNA ...
1-88
1.49e-24
DNA Topoisomerase, subtype IA; DNA-binding, ATP-binding and catalytic domain of bacterial DNA topoisomerases I and III, and eukaryotic DNA topoisomerase III and eubacterial and archael reverse gyrases. Topoisomerases clevage single or double stranded DNA and then rejoin the broken phosphodiester backbone. Proposed catalytic mechanism of single stranded DNA cleavage is by phosphoryl transfer through a tyrosine nucleophile using acid/base catalysis. Tyr is activated by a nearby group (not yet identified) acting as a general base for nucleophilic attack on the 5' phosphate of the scissile bond. Arg and Lys stabilize the pentavalent transition state. Glu then acts as a proton donor for the leaving 3'-oxygen, upon cleavage of the scissile strand.
The actual alignment was detected with superfamily member cd00186:
Pssm-ID: 357420 [Multi-domain] Cd Length: 381 Bit Score: 103.07 E-value: 1.49e-24
DNA Topoisomerase, subtype IA; DNA-binding, ATP-binding and catalytic domain of bacterial DNA ...
1-88
1.49e-24
DNA Topoisomerase, subtype IA; DNA-binding, ATP-binding and catalytic domain of bacterial DNA topoisomerases I and III, and eukaryotic DNA topoisomerase III and eubacterial and archael reverse gyrases. Topoisomerases clevage single or double stranded DNA and then rejoin the broken phosphodiester backbone. Proposed catalytic mechanism of single stranded DNA cleavage is by phosphoryl transfer through a tyrosine nucleophile using acid/base catalysis. Tyr is activated by a nearby group (not yet identified) acting as a general base for nucleophilic attack on the 5' phosphate of the scissile bond. Arg and Lys stabilize the pentavalent transition state. Glu then acts as a proton donor for the leaving 3'-oxygen, upon cleavage of the scissile strand.
Pssm-ID: 238110 [Multi-domain] Cd Length: 381 Bit Score: 103.07 E-value: 1.49e-24
DNA topoisomerase; This subfamily of topoisomerase is divided on the basis that these enzymes ...
1-79
2.49e-22
DNA topoisomerase; This subfamily of topoisomerase is divided on the basis that these enzymes preferentially relax negatively supercoiled DNA, from a 5' phospho- tyrosine linkage in the enzyme-DNA covalent intermediate and has high affinity for single stranded DNA.
Pssm-ID: 426069 [Multi-domain] Cd Length: 410 Bit Score: 97.31 E-value: 2.49e-22
Bacterial DNA topoisomerase I DNA-binding domain; Bacterial DNA topoisomerase I and III, ...
1-39
6.55e-11
Bacterial DNA topoisomerase I DNA-binding domain; Bacterial DNA topoisomerase I and III, Eukaryotic DNA topoisomeraes III, reverse gyrase alpha subunit
Pssm-ID: 214663 [Multi-domain] Cd Length: 259 Bit Score: 61.88 E-value: 6.55e-11
DNA Topoisomerase, subtype IA; DNA-binding, ATP-binding and catalytic domain of bacterial DNA ...
1-88
1.49e-24
DNA Topoisomerase, subtype IA; DNA-binding, ATP-binding and catalytic domain of bacterial DNA topoisomerases I and III, and eukaryotic DNA topoisomerase III and eubacterial and archael reverse gyrases. Topoisomerases clevage single or double stranded DNA and then rejoin the broken phosphodiester backbone. Proposed catalytic mechanism of single stranded DNA cleavage is by phosphoryl transfer through a tyrosine nucleophile using acid/base catalysis. Tyr is activated by a nearby group (not yet identified) acting as a general base for nucleophilic attack on the 5' phosphate of the scissile bond. Arg and Lys stabilize the pentavalent transition state. Glu then acts as a proton donor for the leaving 3'-oxygen, upon cleavage of the scissile strand.
Pssm-ID: 238110 [Multi-domain] Cd Length: 381 Bit Score: 103.07 E-value: 1.49e-24
DNA topoisomerase; This subfamily of topoisomerase is divided on the basis that these enzymes ...
1-79
2.49e-22
DNA topoisomerase; This subfamily of topoisomerase is divided on the basis that these enzymes preferentially relax negatively supercoiled DNA, from a 5' phospho- tyrosine linkage in the enzyme-DNA covalent intermediate and has high affinity for single stranded DNA.
Pssm-ID: 426069 [Multi-domain] Cd Length: 410 Bit Score: 97.31 E-value: 2.49e-22
Bacterial DNA topoisomerase I DNA-binding domain; Bacterial DNA topoisomerase I and III, ...
1-39
6.55e-11
Bacterial DNA topoisomerase I DNA-binding domain; Bacterial DNA topoisomerase I and III, Eukaryotic DNA topoisomeraes III, reverse gyrase alpha subunit
Pssm-ID: 214663 [Multi-domain] Cd Length: 259 Bit Score: 61.88 E-value: 6.55e-11
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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of your query sequence and the protein sequences used to curate the domain model,
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The thumbnail image, if present, provides an approximate view of the feature's location in 3 dimensions.
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Functional characterization of the conserved domain architecture found on the query.
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This image shows a graphical summary of conserved domains identified on the query sequence.
The Show Concise/Full Display button at the top of the page can be used to select the desired level of detail: only top scoring hits
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if a domain or superfamily has been annotated with functional sites (conserved features),
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click on the bars or triangles to view your query sequence embedded in a multiple sequence alignment of the proteins used to develop the corresponding domain model.
The table lists conserved domains identified on the query sequence. Click on the plus sign (+) on the left to display full descriptions, alignments, and scores.
Click on the domain model's accession number to view the multiple sequence alignment of the proteins used to develop the corresponding domain model.
To view your query sequence embedded in that multiple sequence alignment, click on the colored bars in the Graphical Summary portion of the search results page,
or click on the triangles, if present, that represent functional sites (conserved features)
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Concise Display shows only the best scoring domain model, in each hit category listed below except non-specific hits, for each region on the query sequence.
(labeled illustration) Standard Display shows only the best scoring domain model from each source, in each hit category listed below for each region on the query sequence.
(labeled illustration) Full Display shows all domain models, in each hit category below, that meet or exceed the RPS-BLAST threshold for statistical significance.
(labeled illustration) Four types of hits can be shown, as available,
for each region on the query sequence:
specific hits meet or exceed a domain-specific e-value threshold
(illustrated example)
and represent a very high confidence that the query sequence belongs to the same protein family as the sequences use to create the domain model
non-specific hits
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the domain superfamily to which the specific and non-specific hits belong
multi-domain models that were computationally detected and are likely to contain multiple single domains
Retrieve proteins that contain one or more of the domains present in the query sequence, using the Conserved Domain Architecture Retrieval Tool
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