View source for 2aoq


==Crystal structure of MutH-unmethylated DNA complex==
<StructureSection load='2aoq' size='340' side='right' caption='[[2aoq]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2aoq]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacterium_influenzae"_lehmann_and_neumann_1896 "bacterium influenzae" lehmann and neumann 1896]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2AOQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2AOQ FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2aor|2aor]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">mutH ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=727 "Bacterium influenzae" Lehmann and Neumann 1896])</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=2aoq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2aoq OCA], [http://pdbe.org/2aoq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2aoq RCSB], [http://www.ebi.ac.uk/pdbsum/2aoq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2aoq ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/MUTH_HAEIN MUTH_HAEIN]] Sequence-specific endonuclease that cleaves unmethylated GATC sequences. It is involved in DNA mismatch repair (By similarity). 
== 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/ao/2aoq_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=2aoq ConSurf].
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== Publication Abstract from PubMed ==
MutH initiates mismatch repair by nicking the transiently unmethylated daughter strand 5' to a GATC sequence. Here, we report crystal structures of MutH complexed with hemimethylated and unmethylated GATC substrates. Both structures contain two Ca2+ ions jointly coordinated by a conserved aspartate and the scissile phosphate, as observed in the restriction endonucleases BamHI and BglI. In the hemimethylated complexes, the active site is more compact and DNA cleavage is more efficient. The Lys residue in the conserved DEK motif coordinates the nucleophilic water in conjunction with the phosphate 3' to the scissile bond; the same Lys is also hydrogen bonded with a carbonyl oxygen in the DNA binding module. We propose that this Lys, which is conserved in many restriction endonucleases and is replaced by Glu or Gln in BamHI and BglII, is a sensor for DNA binding and the linchpin that couples base recognition and DNA cleavage.

MutH complexed with hemi- and unmethylated DNAs: coupling base recognition and DNA cleavage.,Lee JY, Chang J, Joseph N, Ghirlando R, Rao DN, Yang W Mol Cell. 2005 Oct 7;20(1):155-66. PMID:16209953<ref>PMID:16209953</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2aoq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacterium influenzae lehmann and neumann 1896]]
[[Category: Chang, J]]
[[Category: Ghirlando, R]]
[[Category: Joseph, N]]
[[Category: Lee, J Y]]
[[Category: Rao, D N]]
[[Category: Yang, W]]
[[Category: Gatc recognition]]
[[Category: Hydrolase-dna complex]]