1p7m

<StructureSection load='1p7m' size='340' side='right'caption='[[1p7m]], [[NMR_Ensembles_of_Models | 25 NMR models]]' scene=''>

<table><tr><td colspan='2'>[[1p7m]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1P7M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1P7M FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADK:3-METHYL-3H-PURIN-6-YLAMINE'>ADK</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;'>[[1lmz|1lmz]], [[1nku|1nku]]</div></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">TAG OR B3549 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/DNA-3-methyladenine_glycosylase_I DNA-3-methyladenine glycosylase I], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.2.20 3.2.2.20] </span></td></tr>

[[https://www.uniprot.org/uniprot/3MG1_ECOLI 3MG1_ECOLI]] Hydrolysis of the deoxyribose N-glycosidic bond to excise 3-methyladenine from the damaged DNA polymer formed by alkylation lesions.

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== Publication Abstract from PubMed ==

The specific recognition mechanisms of DNA repair glycosylases that remove cationic alkylpurine bases in DNA are not well understood partly due to the absence of structures of these enzymes with their cognate bases. Here we report the solution structure of 3-methyladenine DNA glycosylase I (TAG) in complex with its 3-methyladenine (3-MeA) cognate base, and we have used chemical perturbation of the base in combination with mutagenesis of the enzyme to evaluate the role of hydrogen bonding and pi-cation interactions in alkylated base recognition by this DNA repair enzyme. We find that TAG uses hydrogen bonding with heteroatoms on the base, van der Waals interactions with the 3-Me group, and conventional pi-pi stacking with a conserved Trp side chain to selectively bind neutral 3-MeA over the cationic form of the base. Discrimination against binding of the normal base adenine is derived from direct sensing of the 3-methyl group, leading to an induced-fit conformational change that engulfs the base in a box defined by five aromatic side chains. These findings indicate that base specific recognition by TAG does not involve strong pi-cation interactions, and suggest a novel mechanism for alkylated base recognition and removal.

Solution structure and base perturbation studies reveal a novel mode of alkylated base recognition by 3-methyladenine DNA glycosylase I.,Cao C, Kwon K, Jiang YL, Drohat AC, Stivers JT J Biol Chem. 2003 Nov 28;278(48):48012-20. Epub 2003 Sep 16. PMID:13129925<ref>PMID:13129925</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 1p7m" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Bacillus coli migula 1895]]

[[Category: DNA-3-methyladenine glycosylase I]]

[[Category: Cao, C]]

[[Category: Drohat, A C]]

[[Category: Jiang, Y L]]

[[Category: Kwon, K]]

[[Category: Stivers, J T]]

[[Category: Hydrolase]]