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[[Image:1qtw.jpg|left|200px]]


{{Structure
==HIGH-RESOLUTION CRYSTAL STRUCTURE OF THE ESCHERICHIA COLI DNA REPAIR ENZYME ENDONUCLEASE IV==
|PDB= 1qtw |SIZE=350|CAPTION= <scene name='initialview01'>1qtw</scene>, resolution 1.02&Aring;
<StructureSection load='1qtw' size='340' side='right'caption='[[1qtw]], [[Resolution|resolution]] 1.02&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND= <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene>
<table><tr><td colspan='2'>[[1qtw]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QTW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QTW FirstGlance]. <br>
|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Deoxyribonuclease_IV_(phage-T(4)-induced) Deoxyribonuclease IV (phage-T(4)-induced)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.21.2 3.1.21.2] </span>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.02&#8491;</td></tr>
|GENE=  
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
|DOMAIN=
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1qtw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qtw OCA], [https://pdbe.org/1qtw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qtw RCSB], [https://www.ebi.ac.uk/pdbsum/1qtw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qtw ProSAT]</span></td></tr>
|RELATEDENTRY=[[1qum|1QUM]]
</table>
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qtw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qtw OCA], [http://www.ebi.ac.uk/pdbsum/1qtw PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1qtw RCSB]</span>
== Function ==
}}
[https://www.uniprot.org/uniprot/END4_ECOLI END4_ECOLI] Endonuclease IV plays a role in DNA repair. It cleaves phosphodiester bonds at apurinic or apyrimidinic sites (AP sites) to produce new 5'-ends that are base-free deoxyribose 5-phosphate residues. It preferentially attacks modified AP sites created by bleomycin and neocarzinostatin.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/qt/1qtw_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1qtw ConSurf].
<div style="clear:both"></div>


'''HIGH-RESOLUTION CRYSTAL STRUCTURE OF THE ESCHERICHIA COLI DNA REPAIR ENZYME ENDONUCLEASE IV'''
==See Also==
 
*[[Endonuclease 3D structures|Endonuclease 3D structures]]
 
__TOC__
==Overview==
</StructureSection>
Endonuclease IV is the archetype for a conserved apurinic/apyrimidinic (AP) endonuclease family that primes DNA repair synthesis by cleaving the DNA backbone 5' of AP sites. The crystal structures of Endonuclease IV and its AP-DNA complex at 1.02 and 1.55 A resolution reveal how an alpha8beta8 TIM barrel fold can bind dsDNA. Enzyme loops intercalate side chains at the abasic site, compress the DNA backbone, bend the DNA approximately 90 degrees, and promote double-nucleotide flipping to sequester the extrahelical AP site in an enzyme pocket that excludes undamaged nucleotides. These structures suggest three Zn2+ ions directly participate in phosphodiester bond cleavage and prompt hypotheses that double-nucleotide flipping and sharp bending by AP endonucleases provide exquisite damage specificity while aiding subsequent base excision repair pathway progression.
 
==About this Structure==
1QTW is a [[Single protein]] structure of 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=1QTW OCA].
 
==Reference==
Structure of the DNA repair enzyme endonuclease IV and its DNA complex: double-nucleotide flipping at abasic sites and three-metal-ion catalysis., Hosfield DJ, Guan Y, Haas BJ, Cunningham RP, Tainer JA, Cell. 1999 Aug 6;98(3):397-408. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10458614 10458614]
[[Category: Deoxyribonuclease IV (phage-T(4)-induced)]]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Cunningham, R P.]]
[[Category: Cunningham RP]]
[[Category: Guan, Y.]]
[[Category: Guan Y]]
[[Category: Haas, B J.]]
[[Category: Haas BJ]]
[[Category: Hosfield, D J.]]
[[Category: Hosfield DJ]]
[[Category: Tainer, J A.]]
[[Category: Tainer JA]]
[[Category: dna repair enzyme]]
[[Category: tim barrel]]
[[Category: trinuclear zn cluster]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:18:55 2008''

Latest revision as of 11:17, 14 February 2024

HIGH-RESOLUTION CRYSTAL STRUCTURE OF THE ESCHERICHIA COLI DNA REPAIR ENZYME ENDONUCLEASE IVHIGH-RESOLUTION CRYSTAL STRUCTURE OF THE ESCHERICHIA COLI DNA REPAIR ENZYME ENDONUCLEASE IV

Structural highlights

1qtw is a 1 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.02Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

END4_ECOLI Endonuclease IV plays a role in DNA repair. It cleaves phosphodiester bonds at apurinic or apyrimidinic sites (AP sites) to produce new 5'-ends that are base-free deoxyribose 5-phosphate residues. It preferentially attacks modified AP sites created by bleomycin and neocarzinostatin.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

1qtw, resolution 1.02Å

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