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| | ==ArsM arsenic(III) S-adenosylmethionine methyltransferase with As(III)== | | ==ArsM arsenic(III) S-adenosylmethionine methyltransferase with As(III)== |
| - | <StructureSection load='4fsd' size='340' side='right' caption='[[4fsd]], [[Resolution|resolution]] 1.75Å' scene=''> | + | <StructureSection load='4fsd' size='340' side='right'caption='[[4fsd]], [[Resolution|resolution]] 1.75Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4fsd]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Cyanidioschyzon_sp._5508 Cyanidioschyzon sp. 5508]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=3qnh 3qnh]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4FSD OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4FSD FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4fsd]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Cyanidioschyzon_sp._5508 Cyanidioschyzon sp. 5508]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=3qnh 3qnh]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4FSD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4FSD FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ARS:ARSENIC'>ARS</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</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]] 1.75Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4fs8|4fs8]], [[4fr0|4fr0]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ARS:ARSENIC'>ARS</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">arsM ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=610260 Cyanidioschyzon sp. 5508])</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=4fsd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4fsd OCA], [https://pdbe.org/4fsd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4fsd RCSB], [https://www.ebi.ac.uk/pdbsum/4fsd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4fsd ProSAT]</span></td></tr> |
| - | <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=4fsd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4fsd OCA], [http://pdbe.org/4fsd PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4fsd RCSB], [http://www.ebi.ac.uk/pdbsum/4fsd PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4fsd ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| - | <div style="background-color:#fffaf0;">
| + | == Function == |
| - | == Publication Abstract from PubMed == | + | [https://www.uniprot.org/uniprot/C0JV69_9RHOD C0JV69_9RHOD] |
| - | Enzymatic methylation of arsenic is a detoxification process in microorganisms but in humans may activate the metalloid to more carcinogenic species. We describe the first structure of an As(III) S-adenosylmethionine methyltransferase by X-ray crystallography that reveals a novel As(III) binding domain. The structure of the methyltransferase from the thermophilic eukaryotic alga Cyanidioschyzon merolae reveals the relationship between the arsenic and S-adenosylmethionine binding sites to a final resolution of approximately 1.6 A. As(III) binding causes little change in conformation, but binding of SAM reorients helix alpha4 and a loop (residues 49-80) toward the As(III) binding domain, positioning the methyl group for transfer to the metalloid. There is no evidence of a reductase domain. These results are consistent with previous suggestions that arsenic remains trivalent during the catalytic cycle. A homology model of human As(III) S-adenosylmethionine methyltransferase with the location of known polymorphisms was constructed. The structure provides insights into the mechanism of substrate binding and catalysis.
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| - | Structure of an As(III) S-Adenosylmethionine Methyltransferase: Insights into the Mechanism of Arsenic Biotransformation.,Ajees AA, Marapakala K, Packianathan C, Sankaran B, Rosen BP Biochemistry. 2012 Jun 29. PMID:22712827<ref>PMID:22712827</ref>
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| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| - | </div>
| + | |
| - | <div class="pdbe-citations 4fsd" style="background-color:#fffaf0;"></div>
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| - | == References ==
| + | |
| - | <references/>
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| | [[Category: Cyanidioschyzon sp. 5508]] | | [[Category: Cyanidioschyzon sp. 5508]] |
| - | [[Category: Ajees, A A]] | + | [[Category: Large Structures]] |
| - | [[Category: Marapakala, K]] | + | [[Category: Ajees AA]] |
| - | [[Category: Packianathan, C]] | + | [[Category: Marapakala K]] |
| - | [[Category: Rosen, B P]] | + | [[Category: Packianathan C]] |
| - | [[Category: Sankaran, B]] | + | [[Category: Rosen BP]] |
| - | [[Category: Arsenic methyltransferase]]
| + | [[Category: Sankaran B]] |
| - | [[Category: Rossmann fold]]
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| - | [[Category: Transferase]]
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