1q7z

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[[Image:1q7z.gif|left|200px]]<br /><applet load="1q7z" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1q7z, resolution 1.70&Aring;" />
 
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'''Cobalamin-dependent methionine synthase (1-566) from Thermotoga maritima (Cd2+ complex)'''<br />
 
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==Overview==
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==Cobalamin-dependent methionine synthase (1-566) from Thermotoga maritima (Cd2+ complex)==
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B(12)-dependent methionine synthase (MetH) is a large modular enzyme that utilizes the cobalamin cofactor as a methyl donor or acceptor in three separate reactions. Each methyl transfer occurs at a different substrate-binding domain and requires a different arrangement of modules. In the catalytic cycle, the cobalamin-binding domain carries methylcobalamin to the homocysteine (Hcy) domain to form methionine and returns cob(I)alamin to the folate (Fol) domain for remethylation by methyltetrahydrofolate (CH(3)-H(4)folate). Here, we describe crystal structures of a fragment of MetH from Thermotoga maritima comprising the domains that bind Hcy and CH(3)-H(4)folate. These substrate-binding domains are (beta alpha)(8) barrels packed tightly against one another with their barrel axes perpendicular. The properties of the domain interface suggest that the two barrels remain associated during catalysis. The Hcy and CH(3)-H(4)folate substrates are bound at the C termini of their respective barrels in orientations that position them for reaction with cobalamin, but the two active sites are separated by approximately 50 A. To complete the catalytic cycle, the cobalamin-binding domain must travel back and forth between these distant active sites.
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<StructureSection load='1q7z' size='340' side='right'caption='[[1q7z]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1q7z]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermotoga_maritima Thermotoga maritima]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Q7Z OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1Q7Z FirstGlance]. <br>
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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]] 1.7&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CD:CADMIUM+ION'>CD</scene></td></tr>
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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=1q7z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q7z OCA], [https://pdbe.org/1q7z PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1q7z RCSB], [https://www.ebi.ac.uk/pdbsum/1q7z PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1q7z ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/Q9WYA5_THEMA Q9WYA5_THEMA]
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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/q7/1q7z_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=1q7z ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1Q7Z is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Thermotoga_maritima Thermotoga maritima] with <scene name='pdbligand=CD:'>CD</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Methionine_synthase Methionine synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.13 2.1.1.13] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Q7Z OCA].
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*[[Methionine synthase 3D structures|Methionine synthase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Structures of the N-terminal modules imply large domain motions during catalysis by methionine synthase., Evans JC, Huddler DP, Hilgers MT, Romanchuk G, Matthews RG, Ludwig ML, Proc Natl Acad Sci U S A. 2004 Mar 16;101(11):3729-36. Epub 2004 Jan 29. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=14752199 14752199]
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[[Category: Large Structures]]
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[[Category: Methionine synthase]]
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[[Category: Single protein]]
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[[Category: Thermotoga maritima]]
[[Category: Thermotoga maritima]]
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[[Category: Evans, J C.]]
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[[Category: Evans JC]]
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[[Category: Hilgers, M T.]]
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[[Category: Hilgers MT]]
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[[Category: Huddler, D P.]]
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[[Category: Huddler DP]]
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[[Category: Ludwig, M L.]]
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[[Category: Ludwig ML]]
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[[Category: Matthews, R G.]]
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[[Category: Matthews RG]]
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[[Category: Romanchuk, G.]]
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[[Category: Romanchuk G]]
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[[Category: CD]]
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[[Category: cobalamin]]
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[[Category: folate]]
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[[Category: homocysteine]]
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[[Category: methionine]]
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[[Category: vitamin b12]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:36:46 2008''
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Current revision

Cobalamin-dependent methionine synthase (1-566) from Thermotoga maritima (Cd2+ complex)

PDB ID 1q7z

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