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| | <StructureSection load='3u6m' size='340' side='right'caption='[[3u6m]], [[Resolution|resolution]] 2.10Å' scene=''> | | <StructureSection load='3u6m' size='340' side='right'caption='[[3u6m]], [[Resolution|resolution]] 2.10Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3u6m]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Atcc_12980 Atcc 12980]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3U6M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3U6M FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3u6m]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Geobacillus_stearothermophilus Geobacillus stearothermophilus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3U6M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3U6M FirstGlance]. <br> |
| - | </td></tr><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> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1Å</td></tr> |
| - | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=8OG:8-OXO-2-DEOXY-GUANOSINE-5-MONOPHOSPHATE'>8OG</scene>, <scene name='pdbligand=CX2:2-DEOXY-5-O-{(R)-HYDROXY[(2-SULFANYLETHYL)AMINO]PHOSPHORYL}CYTIDINE'>CX2</scene></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=8OG:8-OXO-2-DEOXY-GUANOSINE-5-MONOPHOSPHATE'>8OG</scene>, <scene name='pdbligand=CX2:2-DEOXY-5-O-{(R)-HYDROXY[(2-SULFANYLETHYL)AMINO]PHOSPHORYL}CYTIDINE'>CX2</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3u6c|3u6c]], [[3u6d|3u6d]], [[3u6e|3u6e]], [[3u6l|3u6l]], [[3u6o|3u6o]], [[3u6p|3u6p]], [[3u6q|3u6q]], [[3u6s|3u6s]]</div></td></tr>
| + | |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/DNA-formamidopyrimidine_glycosylase DNA-formamidopyrimidine glycosylase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.2.23 3.2.2.23] </span></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=3u6m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3u6m OCA], [https://pdbe.org/3u6m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3u6m RCSB], [https://www.ebi.ac.uk/pdbsum/3u6m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3u6m ProSAT]</span></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=3u6m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3u6m OCA], [https://pdbe.org/3u6m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3u6m RCSB], [https://www.ebi.ac.uk/pdbsum/3u6m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3u6m ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/P84131_GEOSE P84131_GEOSE]] Involved in base excision repair of DNA damaged by oxidation or by mutagenic agents. Acts as DNA glycosylase that recognizes and removes damaged bases. Has a preference for oxidized purines, such as 7,8-dihydro-8-oxoguanine (8-oxoG). Has AP (apurinic/apyrimidinic) lyase activity and introduces nicks in the DNA strand. Cleaves the DNA backbone by beta-delta elimination to generate a single-strand break at the site of the removed base with both 3'- and 5'-phosphates (By similarity).[HAMAP-Rule:MF_00103][SAAS:SAAS020629_004_120556]
| + | [https://www.uniprot.org/uniprot/P84131_GEOSE P84131_GEOSE] Involved in base excision repair of DNA damaged by oxidation or by mutagenic agents. Acts as DNA glycosylase that recognizes and removes damaged bases. Has a preference for oxidized purines, such as 7,8-dihydro-8-oxoguanine (8-oxoG). Has AP (apurinic/apyrimidinic) lyase activity and introduces nicks in the DNA strand. Cleaves the DNA backbone by beta-delta elimination to generate a single-strand break at the site of the removed base with both 3'- and 5'-phosphates (By similarity).[HAMAP-Rule:MF_00103][SAAS:SAAS020629_004_120556] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Atcc 12980]] | + | [[Category: Geobacillus stearothermophilus]] |
| - | [[Category: DNA-formamidopyrimidine glycosylase]]
| + | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Qi, Y]] | + | [[Category: Qi Y]] |
| - | [[Category: Sung, R J]] | + | [[Category: Sung RJ]] |
| - | [[Category: Verdine, G L]] | + | [[Category: Verdine GL]] |
| - | [[Category: Zhang, M]] | + | [[Category: Zhang M]] |
| - | [[Category: Disulfide crosslinking]]
| + | |
| - | [[Category: Dna glycosylase]]
| + | |
| - | [[Category: Dna repair]]
| + | |
| - | [[Category: Hydrolase-dna complex]]
| + | |
| - | [[Category: Lesion recognition]]
| + | |
| - | [[Category: Sequence context]]
| + | |
| Structural highlights
Function
P84131_GEOSE Involved in base excision repair of DNA damaged by oxidation or by mutagenic agents. Acts as DNA glycosylase that recognizes and removes damaged bases. Has a preference for oxidized purines, such as 7,8-dihydro-8-oxoguanine (8-oxoG). Has AP (apurinic/apyrimidinic) lyase activity and introduces nicks in the DNA strand. Cleaves the DNA backbone by beta-delta elimination to generate a single-strand break at the site of the removed base with both 3'- and 5'-phosphates (By similarity).[HAMAP-Rule:MF_00103][SAAS:SAAS020629_004_120556]
Publication Abstract from PubMed
MutM, a bacterial DNA-glycosylase, plays a critical role in maintaining genome integrity by catalyzing glycosidic bond cleavage of 8-oxoguanine (oxoG) lesions to initiate base excision DNA repair (BER). The task faced by MutM of locating rare oxoG residues embedded in an overwhelming excess of undamaged bases is especially challenging, given the close structural similarity between oxoG and its normal progenitor, G. MutM actively interrogates the DNA in order to detect the presence of an intrahelical, fully base-paired oxoG, whereupon the enzyme promotes extrusion of the target nucleobase from the DNA duplex and insertion into the extrahelical active site. Recent structural studies have begun to provide the first glimpse into the protein-DNA interactions that enable MutM to distinguish an intrahelical oxoG from G; however, these initial studies left open the important question of how MutM can recognize oxoG residues embedded in 16 different neighboring sequence contexts (considering only the 5'- and 3'-neigboring base pairs). In this study, we set out to understand the manner and extent to which intrahelical lesion recognition varies as a function of the 5'-neighbor. Here we report a comprehensive, systematic structural analysis of the effect of the 5'-neighboring base-pair on recognition of an intrahelical oxoG lesion. These structures reveal that MutM imposes the same extrusion-prone (extrudogenic) backbone conformation on the oxoG lesion, irrespective of its 5'-neighbor, while leaving the rest of the DNA relatively free to adjust to the particular demands of individual sequences.
SEQUENCE-DEPENDENT STRUCTURAL VARIATION IN DNA UNDERGOING INTRAHELICAL INSPECTION BY MUTM.,Sung RJ, Zhang M, Qi Y, Verdine GL J Biol Chem. 2012 Mar 30. PMID:22465958[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Sung RJ, Zhang M, Qi Y, Verdine GL. SEQUENCE-DEPENDENT STRUCTURAL VARIATION IN DNA UNDERGOING INTRAHELICAL INSPECTION BY MUTM. J Biol Chem. 2012 Mar 30. PMID:22465958 doi:10.1074/jbc.M111.313635
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