4e9e

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==Structure of the glycosylase domain of MBD4==
==Structure of the glycosylase domain of MBD4==
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<StructureSection load='4e9e' size='340' side='right' caption='[[4e9e]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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<StructureSection load='4e9e' size='340' side='right'caption='[[4e9e]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[4e9e]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4E9E OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4E9E FirstGlance]. <br>
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<table><tr><td colspan='2'>[[4e9e]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4E9E OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4E9E FirstGlance]. <br>
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</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3iho|3iho]], [[4e9f|4e9f]], [[4e9g|4e9g]], [[4e9h|4e9h]], [[4ea4|4ea4]], [[4eab|4eab]]</td></tr>
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</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>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">MBD4, MED1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4e9e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4e9e OCA], [https://pdbe.org/4e9e PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4e9e RCSB], [https://www.ebi.ac.uk/pdbsum/4e9e PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4e9e ProSAT]</span></td></tr>
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<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=4e9e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4e9e OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4e9e RCSB], [http://www.ebi.ac.uk/pdbsum/4e9e PDBsum]</span></td></tr>
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</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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[https://www.uniprot.org/uniprot/MBD4_HUMAN MBD4_HUMAN] Mismatch-specific DNA N-glycosylase involved in DNA repair. Has thymine glycosylase activity and is specific for G:T mismatches within methylated and unmethylated CpG sites. Can also remove uracil or 5-fluorouracil in G:U mismatches. Has no lyase activity. Was first identified as methyl-CpG-binding protein.<ref>PMID:10097147</ref> <ref>PMID:10930409</ref>
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Active DNA demethylation in mammals occurs via hydroxylation of 5-methylcytosine to 5-hydroxymethylcytosine (5hmC) by the ten-eleven translocation family of proteins (TETs). 5hmC residues in DNA can be further oxidized by TETs to 5-carboxylcytosines and/or deaminated by the Activation Induced Deaminase/Apolipoprotein B mRNA-editing enzyme complex family proteins to 5-hydromethyluracil (5hmU). Excision and replacement of these intermediates is initiated by DNA glycosylases such as thymine-DNA glycosylase (TDG), methyl-binding domain protein 4 (MBD4) and single-strand specific monofunctional uracil-DNA glycosylase 1 in the base excision repair pathway. Here, we report detailed biochemical and structural characterization of human MBD4 which contains mismatch-specific TDG activity. Full-length as well as catalytic domain (residues 426-580) of human MBD4 (MBD4(cat)) can remove 5hmU when opposite to G with good efficiency. Here, we also report six crystal structures of human MBD4(cat): an unliganded form and five binary complexes with duplex DNA containing a T*G, 5hmU*G or AP*G (apurinic/apyrimidinic) mismatch at the target base pair. These structures reveal that MBD4(cat) uses a base flipping mechanism to specifically recognize thymine and 5hmU. The recognition mechanism of flipped-out 5hmU bases in MBD4(cat) active site supports the potential role of MBD4, together with TDG, in maintenance of genome stability and active DNA demethylation in mammals.
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Biochemical and structural characterization of the glycosylase domain of MBD4 bound to thymine and 5-hydroxymethyuracil-containing DNA.,Morera S, Grin I, Vigouroux A, Couve S, Henriot V, Saparbaev M, Ishchenko AA Nucleic Acids Res. 2012 Jul 30. PMID:22848106<ref>PMID:22848106</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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==See Also==
==See Also==
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*[[Methyl CpG binding protein|Methyl CpG binding protein]]
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*[[Methyl CpG binding protein 3D structures|Methyl CpG binding protein 3D structures]]
== References ==
== References ==
<references/>
<references/>
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</StructureSection>
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Morera, S]]
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[[Category: Large Structures]]
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[[Category: Vigouroux, A]]
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[[Category: Morera S]]
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[[Category: Hhh dna glycosylase superfamily]]
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[[Category: Vigouroux A]]
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[[Category: Hydrolase]]
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Current revision

Structure of the glycosylase domain of MBD4

PDB ID 4e9e

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