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[[Image:1q8a.gif|left|200px]]
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{{STRUCTURE_1q8a|  PDB=1q8a  |  SCENE=  }}
'''Cobalamin-dependent methionine synthase (1-566) from Thermotoga maritima (Cd2+:L-Hcy complex, Se-Met)'''


==Cobalamin-dependent methionine synthase (1-566) from Thermotoga maritima (Cd2+:L-Hcy complex, Se-Met)==
<StructureSection load='1q8a' size='340' side='right'caption='[[1q8a]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1q8a]] 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=1Q8A OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1Q8A 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]] 1.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CD:CADMIUM+ION'>CD</scene>, <scene name='pdbligand=HCS:2-AMINO-4-MERCAPTO-BUTYRIC+ACID'>HCS</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=1q8a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q8a OCA], [https://pdbe.org/1q8a PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1q8a RCSB], [https://www.ebi.ac.uk/pdbsum/1q8a PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1q8a ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q9WYA5_THEMA Q9WYA5_THEMA]
== 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/q8/1q8a_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1q8a ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
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.


==Overview==
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:14752199<ref>PMID:14752199</ref>
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.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
1Q8A is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Thermotoga_maritima Thermotoga maritima]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Q8A OCA].
</div>
<div class="pdbe-citations 1q8a" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
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://www.ncbi.nlm.nih.gov/pubmed/14752199 14752199]
*[[Methionine synthase 3D structures|Methionine synthase 3D structures]]
[[Category: Methionine synthase]]
== References ==
[[Category: Single protein]]
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Thermotoga maritima]]
[[Category: Thermotoga maritima]]
[[Category: Evans, J C.]]
[[Category: Evans JC]]
[[Category: Hilgers, M T.]]
[[Category: Hilgers MT]]
[[Category: Huddler, D P.]]
[[Category: Huddler DP]]
[[Category: Ludwig, M L.]]
[[Category: Ludwig ML]]
[[Category: Matthews, R G.]]
[[Category: Matthews RG]]
[[Category: Romanchuk, G.]]
[[Category: Romanchuk G]]
[[Category: Cobalamin]]
[[Category: Folate]]
[[Category: Homocysteine]]
[[Category: Methionine]]
[[Category: Vitamin b12]]
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