Protein Domain : IPR013497

Type:  Domain Name:  DNA topoisomerase, type IA, central
Description:  DNA topoisomerases regulate the number of topological links between two DNA strands (i.e. change the number of superhelical turns) by catalysing transient single- or double-strand breaks, crossing the strands through one another, then resealing the breaks []. These enzymes have several functions: to remove DNA supercoils during transcription and DNA replication; for strand breakage during recombination; for chromosome condensation; and to disentangle intertwined DNA during mitosis [, ]. DNA topoisomerases are divided into two classes: type I enzymes (; topoisomerases I, III and V) break single-strand DNA, and type II enzymes (; topoisomerases II, IV and VI) break double-strand DNA [].Type I topoisomerases are ATP-independent enzymes (except for reverse gyrase), and can be subdivided according to their structure and reaction mechanisms: type IA (bacterial and archaeal topoisomerase I, topoisomerase III and reverse gyrase) and type IB (eukaryotic topoisomerase I and topoisomerase V). These enzymes are primarily responsible for relaxing positively and/or negatively supercoiled DNA, except for reverse gyrase, which can introduce positive supercoils into DNA. Type IA topoisomerases are comprised of four domains that together form a toroidal structure with a central hole large enough to accommodate single- and double-stranded DNA: an N-terminal alpha/beta Toprim domain, domain 2 and the C-terminal domain 4 are winged-helix domains, and domain 3 is a beta-barrel. Domains 1 (Toprim) and 3 form the active site of the enzyme, while the winged helix domains 2 and 4 form a single-strand DNA-binding groove [, ]. This entry represents the central portion of the enzyme, which covers domains 2 and 3 in topoisomerase type IA enzymes. Short Name:  Topo_IA_cen

0 Child Features

5 Contains

DB identifier Type Name
IPR013826 Domain DNA topoisomerase, type IA, central region, subdomain 3
IPR013824 Domain DNA topoisomerase, type IA, central region, subdomain 1
IPR013825 Domain DNA topoisomerase, type IA, central region, subdomain 2
IPR003602 Domain DNA topoisomerase, type IA, DNA-binding domain
IPR003601 Domain DNA topoisomerase, type IA, domain 2

1 Cross References

Identifier
PF01131

5 Found Ins

DB identifier Type Name
IPR005733 Family DNA topoisomerase I, bacterial-type
IPR000380 Family DNA topoisomerase, type IA
IPR005738 Family DNA topoisomerase III
IPR005739 Family DNA topoisomerase I, archeal-type
IPR005736 Family Reverse gyrase

3 GO Annotations

GO Term Gene Name
GO:0003677 IPR013497
GO:0003916 IPR013497
GO:0006265 IPR013497

3 Ontology Annotations

GO Term Gene Name
GO:0003677 IPR013497
GO:0003916 IPR013497
GO:0006265 IPR013497

0 Parent Features

3256 Proteins

DB identifier UniProt Accession Secondary Identifier Organism Name Length
94303 D8RIM2 PAC:15423298 Selaginella moellendorffii 794  
168492 D8R567 PAC:15422213 Selaginella moellendorffii 871  
123748 D8SSL3 PAC:15403346 Selaginella moellendorffii 795  
446893 D8SV71 PAC:15403280 Selaginella moellendorffii 193  
evm.model.supercontig_157.4 PAC:16409827 Carica papaya 867  
evm.model.supercontig_246.4 PAC:16414635 Carica papaya 268  
evm.model.supercontig_246.5 PAC:16414636 Carica papaya 619  
evm.model.supercontig_37.4 PAC:16418711 Carica papaya 460  
30149.m000235 B9SN22 PAC:16820644 Ricinus communis 833  
30183.m001296 B9RRL8 PAC:16822981 Ricinus communis 865  
28226.m000877 B9SPT5 PAC:16800410 Ricinus communis 1071  
Cucsa.337050.1 PAC:16978549 Cucumis sativus 603  
Cucsa.251840.1 A0A0A0L9C7 PAC:16971857 Cucumis sativus 867  
Cucsa.311140.2 PAC:16976640 Cucumis sativus 1135  
Cucsa.311140.1 PAC:16976639 Cucumis sativus 1173  
orange1.1g001100m PAC:18109309 Citrus sinensis 1158  
orange1.1g001106m PAC:18109310 Citrus sinensis 1157  
orange1.1g046997m PAC:18126654 Citrus sinensis 807  
orange1.1g045217m PAC:18138437 Citrus sinensis 224  
AT4G31210.1 F4JRX3 PAC:19645326 Arabidopsis thaliana 1284  
AT5G63920.1 Q9LVP1 PAC:19666283 Arabidopsis thaliana 926  
AT2G32000.2 F4ISQ7 PAC:19638736 Arabidopsis thaliana 838  
AT2G32000.1 F4ISQ7 PAC:19638735 Arabidopsis thaliana 865  
Thhalv10024242m V4MCD4 PAC:20195642 Eutrema salsugineum 1214  
Thhalv10016222m V4M685 PAC:20180552 Eutrema salsugineum 879  
Thhalv10003618m V4KVW8 PAC:20198579 Eutrema salsugineum 930  
Ciclev10003112m V4SX32 PAC:20788824 Citrus clementina 794  
Ciclev10007345m V4UBC5 PAC:20796004 Citrus clementina 984  
Ciclev10006835m V4S647 PAC:20791993 Citrus clementina 445  
Ciclev10007073m V4SBG7 PAC:20792374 Citrus clementina 93  

6 Publications

First Author Title Year Journal Volume Pages PubMed ID
            7770916
            11395412
            12596227
            12042765
            14604525
            10574789