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==Crystal Structure of the E9 DNase Domain with a Mutant Immunity Protein IM9 (V34A)==
==Crystal Structure of the E9 DNase Domain with a Mutant Immunity Protein IM9 (V34A)==
<StructureSection load='2gzi' size='340' side='right' caption='[[2gzi]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
<StructureSection load='2gzi' size='340' side='right'caption='[[2gzi]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[2gzi]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GZI OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2GZI FirstGlance]. <br>
<table><tr><td colspan='2'>[[2gzi]] is a 2 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=2GZI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2GZI FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.7&#8491;</td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1emv|1emv]], [[1bxi|1bxi]], [[2gyk|2gyk]], [[2gze|2gze]], [[2gzf|2gzf]], [[2gzg|2gzg]], [[2gzj|2gzj]]</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">imm, ceiE9 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI]), col, cei ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2gzi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gzi OCA], [https://pdbe.org/2gzi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2gzi RCSB], [https://www.ebi.ac.uk/pdbsum/2gzi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2gzi ProSAT]</span></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Deoxyribonuclease_I Deoxyribonuclease I], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.21.1 3.1.21.1] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2gzi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gzi OCA], [http://pdbe.org/2gzi PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2gzi RCSB], [http://www.ebi.ac.uk/pdbsum/2gzi PDBsum]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/IMM9_ECOLX IMM9_ECOLX]] This protein is able to protect a cell, which harbors the plasmid ColE9 encoding colicin E9, against colicin E9, it binds specifically to the DNase-type colicin and inhibits its bactericidal activity. [[http://www.uniprot.org/uniprot/CEA9_ECOLX CEA9_ECOLX]] This plasmid-coded bactericidal protein is an endonuclease active on both single- and double-stranded DNA but with undefined specificity.  Colicins are polypeptide toxins produced by and active against E.coli and closely related bacteria.  
[https://www.uniprot.org/uniprot/IMM9_ECOLX IMM9_ECOLX] This protein is able to protect a cell, which harbors the plasmid ColE9 encoding colicin E9, against colicin E9, it binds specifically to the DNase-type colicin and inhibits its bactericidal activity.
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
Check<jmol>
   <jmolCheckbox>
   <jmolCheckbox>
     <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/gz/2gzi_consurf.spt"</scriptWhenChecked>
     <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/gz/2gzi_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
     <text>to colour the structure by Evolutionary Conservation</text>
   </jmolCheckbox>
   </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/chain_selection.php?pdb_ID=2ata ConSurf].
</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=2gzi ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The crystal structure of the cytotoxic endonuclease domain from the bacterial toxin colicin E9 in complex with its cognate immunity protein Im9 reveals that the inhibitor does not bind at the active site, the core of which comprises the HNH motif found in intron-encoded homing endonucleases, but rather at an adjacent position leaving the active site exposed yet unable to bind DNA because of steric and electrostatic clashes with incoming substrate. Although its mode of action is unorthodox, Im9 is a remarkably effective inhibitor since it folds within milliseconds and then associates with its target endonuclease at the rate of diffusion to form an inactive complex with sub-femtomolar binding affinity. This hyperefficient mechanism of inhibition could be well suited to other toxic enzyme systems, particularly where the substrate is a polymer extending beyond the boundaries of the active site.
Structural and mechanistic basis of immunity toward endonuclease colicins.,Kleanthous C, Kuhlmann UC, Pommer AJ, Ferguson N, Radford SE, Moore GR, James R, Hemmings AM Nat Struct Biol. 1999 Mar;6(3):243-52. PMID:10074943<ref>PMID:10074943</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2gzi" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[Colicin|Colicin]]
*[[Colicin 3D structures|Colicin 3D structures]]
*[[Colicin Immunity Protein|Colicin Immunity Protein]]
*[[Colicin immunity protein 3D structures|Colicin immunity protein 3D structures]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Deoxyribonuclease I]]
[[Category: Escherichia coli K-12]]
[[Category: Ecoli]]
[[Category: Large Structures]]
[[Category: Hemmings, A M]]
[[Category: Hemmings AM]]
[[Category: Kleanthous, C]]
[[Category: Kleanthous C]]
[[Category: Kolade, O O]]
[[Category: Kolade OO]]
[[Category: Kuhlmann, U C]]
[[Category: Kuhlmann UC]]
[[Category: Santi, P S]]
[[Category: Santi PS]]
[[Category: 4-helix bundle]]
[[Category: Antibiotic-antibiotic inhibitor complex]]
[[Category: Dnase domain]]
[[Category: Hnh-motif]]
[[Category: Protein-protein complex]]

Latest revision as of 12:49, 30 August 2023

Crystal Structure of the E9 DNase Domain with a Mutant Immunity Protein IM9 (V34A)Crystal Structure of the E9 DNase Domain with a Mutant Immunity Protein IM9 (V34A)

Structural highlights

2gzi is a 2 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.7Å
Ligands:,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

IMM9_ECOLX This protein is able to protect a cell, which harbors the plasmid ColE9 encoding colicin E9, against colicin E9, it binds specifically to the DNase-type colicin and inhibits its bactericidal activity.

Evolutionary Conservation

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

See Also

2gzi, resolution 1.70Å

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