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1g55

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[[Image:1g55.gif|left|200px]]
 
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{{Structure
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==Structure of human DNMT2, an enigmatic DNA methyltransferase homologue==
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|PDB= 1g55 |SIZE=350|CAPTION= <scene name='initialview01'>1g55</scene>, resolution 1.8&Aring;
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<StructureSection load='1g55' size='340' side='right'caption='[[1g55]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND= <scene name='pdbligand=BME:BETA-MERCAPTOETHANOL'>BME</scene>, <scene name='pdbligand=CSO:S-HYDROXYCYSTEINE'>CSO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SAH:S-ADENOSYL-L-HOMOCYSTEINE'>SAH</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>
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<table><tr><td colspan='2'>[[1g55]] 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=1G55 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1G55 FirstGlance]. <br>
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/DNA_(cytosine-5-)-methyltransferase DNA (cytosine-5-)-methyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.37 2.1.1.37] </span>
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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]] 1.8&#8491;</td></tr>
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|GENE=
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BME:BETA-MERCAPTOETHANOL'>BME</scene>, <scene name='pdbligand=CSO:S-HYDROXYCYSTEINE'>CSO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SAH:S-ADENOSYL-L-HOMOCYSTEINE'>SAH</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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|DOMAIN=
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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=1g55 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g55 OCA], [https://pdbe.org/1g55 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1g55 RCSB], [https://www.ebi.ac.uk/pdbsum/1g55 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1g55 ProSAT]</span></td></tr>
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|RELATEDENTRY=
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</table>
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1g55 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g55 OCA], [http://www.ebi.ac.uk/pdbsum/1g55 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1g55 RCSB]</span>
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== Function ==
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}}
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[https://www.uniprot.org/uniprot/TRDMT_HUMAN TRDMT_HUMAN] Specifically methylates cytosine 38 in the anticodon loop of tRNA(Asp).<ref>PMID:16424344</ref>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/g5/1g55_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1g55 ConSurf].
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<div style="clear:both"></div>
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'''STRUCTURE OF HUMAN DNMT2, AN ENIGMATIC DNA METHYLTRANSFERASE HOMOLOGUE'''
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==See Also==
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*[[DNA methyltransferase 3D structures|DNA methyltransferase 3D structures]]
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== References ==
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==Overview==
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<references/>
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DNMT2 is a human protein that displays strong sequence similarities to DNA (cytosine-5)-methyltransferases (m(5)C MTases) of both prokaryotes and eukaryotes. DNMT2 contains all 10 sequence motifs that are conserved among m(5)C MTases, including the consensus S:-adenosyl-L-methionine-binding motifs and the active site ProCys dipeptide. DNMT2 has close homologs in plants, insects and Schizosaccharomyces pombe, but no related sequence can be found in the genomes of Saccharomyces cerevisiae or Caenorhabditis elegans. The crystal structure of a deletion mutant of DNMT2 complexed with S-adenosyl-L-homocysteine (AdoHcy) has been determined at 1.8 A resolution. The structure of the large domain that contains the sequence motifs involved in catalysis is remarkably similar to that of M.HHAI, a confirmed bacterial m(5)C MTase, and the smaller target recognition domains of DNMT2 and M.HHAI are also closely related in overall structure. The small domain of DNMT2 contains three short helices that are not present in M.HHAI. DNMT2 binds AdoHcy in the same conformation as confirmed m(5)C MTases and, while DNMT2 shares all sequence and structural features with m(5)C MTases, it has failed to demonstrate detectable transmethylase activity. We show here that homologs of DNMT2, which are present in some organisms that are not known to methylate their genomes, contain a specific target-recognizing sequence motif including an invariant CysPheThr tripeptide. DNMT2 binds DNA to form a denaturant-resistant complex in vitro. While the biological function of DNMT2 is not yet known, the strong binding to DNA suggests that DNMT2 may mark specific sequences in the genome by binding to DNA through the specific target-recognizing motif.
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__TOC__
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</StructureSection>
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==About this Structure==
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1G55 is a [[Single protein]] structure of 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=1G55 OCA].
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==Reference==
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Structure of human DNMT2, an enigmatic DNA methyltransferase homolog that displays denaturant-resistant binding to DNA., Dong A, Yoder JA, Zhang X, Zhou L, Bestor TH, Cheng X, Nucleic Acids Res. 2001 Jan 15;29(2):439-48. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11139614 11139614]
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[[Category: DNA (cytosine-5-)-methyltransferase]]
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[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Bestor, T H.]]
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[[Category: Bestor TH]]
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[[Category: Cheng, X.]]
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[[Category: Cheng X]]
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[[Category: Dong, A.]]
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[[Category: Dong A]]
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[[Category: Yoder, J A.]]
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[[Category: Yoder JA]]
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[[Category: Zhang, X.]]
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[[Category: Zhang X]]
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[[Category: Zhou, L.]]
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[[Category: Zhou L]]
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[[Category: human dna methyltransferase homologue]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:36:46 2008''
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Current revision

Structure of human DNMT2, an enigmatic DNA methyltransferase homologue

PDB ID 1g55

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