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[[Image:3pwt.png|left|200px]]


{{STRUCTURE_3pwt|  PDB=3pwt  |  SCENE=  }}
==Crystal structure of mutant E.coli topoisomerase IA==
 
<StructureSection load='3pwt' size='340' side='right'caption='[[3pwt]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
===Crystal structure of mutant E.coli topoisomerase IA===
== Structural highlights ==
 
<table><tr><td colspan='2'>[[3pwt]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PWT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3PWT FirstGlance]. <br>
 
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
==About this Structure==
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
[[3pwt]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PWT OCA].  
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3pwt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3pwt OCA], [https://pdbe.org/3pwt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3pwt RCSB], [https://www.ebi.ac.uk/pdbsum/3pwt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3pwt ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TOP1_ECOLI TOP1_ECOLI] Releases the supercoiling and torsional tension of DNA, which is introduced during the DNA replication and transcription, by transiently cleaving and rejoining one strand of the DNA duplex. Introduces a single-strand break via transesterification at a target site in duplex DNA. The scissile phosphodiester is attacked by the catalytic tyrosine of the enzyme, resulting in the formation of a DNA-(5'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 3'-OH DNA strand. The free DNA strand then undergoes passage around the unbroken strand, thus removing DNA supercoils. Finally, in the religation step, the DNA 3'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone.<ref>PMID:9497321</ref> <ref>PMID:10681504</ref> <ref>PMID:21482796</ref>


==See Also==
==See Also==
*[[Topoisomerase|Topoisomerase]]
*[[Topoisomerase 3D structures|Topoisomerase 3D structures]]
[[Category: DNA topoisomerase]]
== References ==
[[Category: Escherichia coli]]
<references/>
[[Category: Bokun, C.]]
__TOC__
[[Category: Tse-Dinh, Y C.]]
</StructureSection>
[[Category: Zhang, Z.]]
[[Category: Escherichia coli K-12]]
[[Category: Dna relaxation]]
[[Category: Large Structures]]
[[Category: Isomerase]]
[[Category: Bokun C]]
[[Category: Topoisomerase]]
[[Category: Tse-Dinh Y-C]]
[[Category: Zhang Z]]
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