1eg2: Difference between revisions
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==CRYSTAL STRUCTURE OF RHODOBACTER SPHEROIDES (N6 ADENOSINE) METHYLTRANSFERASE (M.RSRI)== | ==CRYSTAL STRUCTURE OF RHODOBACTER SPHEROIDES (N6 ADENOSINE) METHYLTRANSFERASE (M.RSRI)== | ||
<StructureSection load='1eg2' size='340' side='right' caption='[[1eg2]], [[Resolution|resolution]] 1.75Å' scene=''> | <StructureSection load='1eg2' size='340' side='right' caption='[[1eg2]], [[Resolution|resolution]] 1.75Å' scene=''> | ||
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MTA:5-DEOXY-5-METHYLTHIOADENOSINE'>MTA</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MTA:5-DEOXY-5-METHYLTHIOADENOSINE'>MTA</scene></td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Site-specific_DNA-methyltransferase_(adenine-specific) Site-specific DNA-methyltransferase (adenine-specific)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.72 2.1.1.72] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Site-specific_DNA-methyltransferase_(adenine-specific) Site-specific DNA-methyltransferase (adenine-specific)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.72 2.1.1.72] </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=1eg2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eg2 OCA], [http://pdbe.org/1eg2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1eg2 RCSB], [http://www.ebi.ac.uk/pdbsum/1eg2 PDBsum], [http://www.topsan.org/Proteins/MCSG/1eg2 TOPSAN]</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=1eg2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eg2 OCA], [http://pdbe.org/1eg2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1eg2 RCSB], [http://www.ebi.ac.uk/pdbsum/1eg2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1eg2 ProSAT], [http://www.topsan.org/Proteins/MCSG/1eg2 TOPSAN]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
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Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/eg/1eg2_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/eg/1eg2_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
Revision as of 10:15, 20 December 2017
CRYSTAL STRUCTURE OF RHODOBACTER SPHEROIDES (N6 ADENOSINE) METHYLTRANSFERASE (M.RSRI)CRYSTAL STRUCTURE OF RHODOBACTER SPHEROIDES (N6 ADENOSINE) METHYLTRANSFERASE (M.RSRI)
Structural highlights
Function[MTR1_RHOSH] This methylase recognizes the double-stranded sequence GAATTC, causes specific methylation on A-? on both strands, and protects the DNA from cleavage by the RsrI endonuclease. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedDNA methylation is important in cellular, developmental and disease processes, as well as in bacterial restriction-modification systems. Methylation of DNA at the amino groups of cytosine and adenine is a common mode of protection against restriction endonucleases afforded by the bacterial methyltransferases. The first structure of an N:6-adenine methyltransferase belonging to the beta class of bacterial methyltransferases is described here. The structure of M. RSR:I from Rhodobacter sphaeroides, which methylates the second adenine of the GAATTC sequence, was determined to 1.75 A resolution using X-ray crystallography. Like other methyltransferases, the enzyme contains the methylase fold and has well-defined substrate binding pockets. The catalytic core most closely resembles the PVU:II methyltransferase, a cytosine amino methyltransferase of the same beta group. The larger nucleotide binding pocket observed in M. RSR:I is expected because it methylates adenine. However, the most striking difference between the RSR:I methyltransferase and the other bacterial enzymes is the structure of the putative DNA target recognition domain, which is formed in part by two helices on an extended arm of the protein on the face of the enzyme opposite the active site. This observation suggests that a dramatic conformational change or oligomerization may take place during DNA binding and methylation. Structure of RsrI methyltransferase, a member of the N6-adenine beta class of DNA methyltransferases.,Scavetta RD, Thomas CB, Walsh MA, Szegedi S, Joachimiak A, Gumport RI, Churchill ME Nucleic Acids Res. 2000 Oct 15;28(20):3950-61. PMID:11024175[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References |
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