1k7y: Difference between revisions

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-[[Image:1k7y.png|left|200px]]
-{{STRUCTURE_1k7y|  PDB=1k7y  |  SCENE=  }}
+==E. coli MetH C-terminal fragment (649-1227)==
+<StructureSection load='1k7y' size='340' side='right'caption='[[1k7y]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[1k7y]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K7Y OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1K7Y FirstGlance]. <br>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3&#8491;</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=B12:COBALAMIN'>B12</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=1k7y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1k7y OCA], [https://pdbe.org/1k7y PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1k7y RCSB], [https://www.ebi.ac.uk/pdbsum/1k7y PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1k7y ProSAT]</span></td></tr>
+</table>
+== Function ==
+[https://www.uniprot.org/uniprot/METH_ECOLI METH_ECOLI] Catalyzes the transfer of a methyl group from methyl-cobalamin to homocysteine, yielding enzyme-bound cob(I)alamin and methionine. Subsequently, remethylates the cofactor using methyltetrahydrofolate.
+== Evolutionary Conservation ==
+[[Image:Consurf_key_small.gif|200px|right]]
+Check<jmol>
+  <jmolCheckbox>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/k7/1k7y_consurf.spt"</scriptWhenChecked>
+    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
+    <text>to colour the structure by Evolutionary Conservation</text>
+  </jmolCheckbox>
+</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=1k7y ConSurf].
+<div style="clear:both"></div>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+B(12)-dependent methionine synthase (MetH) from Escherichia coli is a large modular protein that uses bound cobalamin as an intermediate methyl carrier. Major domain rearrangements have been postulated to explain how cobalamin reacts with three different substrates: homocysteine, methyltetrahydrofolate and S-adenosylmethionine (AdoMet). Here we describe the 3.0 A structure of a 65 kDa C-terminal fragment of MetH that spans the cobalamin- and AdoMet-binding domains, arranged in a conformation suitable for the methyl transfer from AdoMet to cobalamin that occurs during activation. In the conversion to the activation conformation, a helical domain that capped the cofactor moves 26 A and rotates by 63 degrees, allowing formation of a new interface between cobalamin and the AdoMet-binding (activation) domain. Interactions with the MetH activation domain drive the cobalamin away from its binding domain in a way that requires dissociation of the axial cobalt ligand and, thereby, provide a mechanism for control of the distribution of enzyme conformations.
-===E. coli MetH C-terminal fragment (649-1227)===
+Domain alternation switches B(12)-dependent methionine synthase to the activation conformation.,Bandarian V, Pattridge KA, Lennon BW, Huddler DP, Matthews RG, Ludwig ML Nat Struct Biol. 2002 Jan;9(1):53-6. PMID:11731805<ref>PMID:11731805</ref>
-{{ABSTRACT_PUBMED_11731805}}
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
+</div>
+<div class="pdbe-citations 1k7y" style="background-color:#fffaf0;"></div>
-==About this Structure==
+==See Also==
-[[1k7y]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K7Y OCA].
+*[[Methionine synthase 3D structures|Methionine synthase 3D structures]]
+== References ==
-==Reference==
+<references/>
-<ref group="xtra">PMID:011731805</ref><references group="xtra"/>
+__TOC__
+</StructureSection>
 [[Category: Escherichia coli]]
-[[Category: Methionine synthase]]
+[[Category: Large Structures]]
-[[Category: Bandarian, V.]]
+[[Category: Bandarian V]]
-[[Category: Huddler, D P.]]
+[[Category: Huddler DP]]
-[[Category: Lennon, B W.]]
+[[Category: Lennon BW]]
-[[Category: Ludwig, M L.]]
+[[Category: Ludwig ML]]
-[[Category: Matthews, R G.]]
+[[Category: Matthews RG]]
-[[Category: Pattridge, K A.]]
+[[Category: Pattridge KA]]
-[[Category: Domain interaction]]
-[[Category: Motion of 4-helix bundle]]
-[[Category: Transferase]]