1sfe
From Proteopedia
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<StructureSection load='1sfe' size='340' side='right'caption='[[1sfe]], [[Resolution|resolution]] 2.10Å' scene=''> | <StructureSection load='1sfe' size='340' side='right'caption='[[1sfe]], [[Resolution|resolution]] 2.10Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
| - | <table><tr><td colspan='2'>[[1sfe]] is a 1 chain structure with sequence from [ | + | <table><tr><td colspan='2'>[[1sfe]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_B Escherichia coli B]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SFE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SFE FirstGlance]. <br> |
| - | </td></tr><tr id=' | + | </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='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1sfe FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sfe OCA], [https://pdbe.org/1sfe PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1sfe RCSB], [https://www.ebi.ac.uk/pdbsum/1sfe PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1sfe ProSAT]</span></td></tr> | |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | + | |
</table> | </table> | ||
== Function == | == Function == | ||
| - | [ | + | [https://www.uniprot.org/uniprot/ADA_ECOLI ADA_ECOLI] Is involved in the adaptive response to alkylation damage in DNA caused by alkylating agents. Repairs O6-methylguanine and 04-methylthymine residues in alkylated DNA by a direct and irreversible transfer of the methyl group from the base to one of its own cysteine residues (Cys-321). Also specifically repairs the Sp diastereomer of DNA methylphosphotriester lesions by the same mechanism, although the methyl transfer occurs onto a different cysteine residue (Cys-38). Can not demethylate the other diastereomer, Rp-methylphosphotriester.<ref>PMID:2987862</ref> The methylation of Ada by methylphosphotriesters in DNA leads to its activation as a transcriptional regulator that activates the transcription of its own gene, ada, and other alkylation resistance genes, alkA, alkB and aidB.<ref>PMID:2987862</ref> |
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
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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=1sfe ConSurf]. | </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=1sfe ConSurf]. | ||
<div style="clear:both"></div> | <div style="clear:both"></div> | ||
| - | <div style="background-color:#fffaf0;"> | ||
| - | == Publication Abstract from PubMed == | ||
| - | The mutagenic and carcinogenic effects of simple alkylating agents are mainly due to methylation at the O6 position of guanine in DNA. O6-methylguanine directs the incorporation of either thymine or cytosine without blocking DNA replication, resulting in GC to AT transition mutations. In prokaryotic and eukaryotic cells antimutagenic repair is effected by direct reversal of this DNA damage. A suicidal methyltransferase repair protein removes the methyl group from DNA to one of its own cysteine residues. The resulting self-methylation of the active site cysteine renders the protein inactive. Here we report the X-ray structure of the 19 kDa C-terminal domain of the Escherichia coli ada gene product, the prototype of these suicidal methyltransferases. In the crystal structure the active site cysteine is buried. We propose a model for the significant conformational change that the protein must undergo in order to bind DNA and effect methyl transfer. | ||
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| - | Crystal structure of a suicidal DNA repair protein: the Ada O6-methylguanine-DNA methyltransferase from E. coli.,Moore MH, Gulbis JM, Dodson EJ, Demple B, Moody PC EMBO J. 1994 Apr 1;13(7):1495-501. PMID:8156986<ref>PMID:8156986</ref> | ||
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| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| - | </div> | ||
| - | <div class="pdbe-citations 1sfe" style="background-color:#fffaf0;"></div> | ||
==See Also== | ==See Also== | ||
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__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
| + | [[Category: Escherichia coli B]] | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
| - | [[Category: Demple | + | [[Category: Demple B]] |
| - | [[Category: Dodson | + | [[Category: Dodson EJ]] |
| - | [[Category: Gulbis | + | [[Category: Gulbis JM]] |
| - | [[Category: Moody | + | [[Category: Moody PCE]] |
| - | [[Category: Moore | + | [[Category: Moore MH]] |
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Current revision
ADA O6-METHYLGUANINE-DNA METHYLTRANSFERASE FROM ESCHERICHIA COLI
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