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1msk

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[[Image:1msk.gif|left|200px]]
 
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==METHIONINE SYNTHASE (ACTIVATION DOMAIN)==
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The line below this paragraph, containing "STRUCTURE_1msk", creates the "Structure Box" on the page.
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<StructureSection load='1msk' size='340' side='right'caption='[[1msk]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1msk]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MSK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MSK FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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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]] 1.8&#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=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=SAM:S-ADENOSYLMETHIONINE'>SAM</scene></td></tr>
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{{STRUCTURE_1msk| PDB=1msk | SCENE= }}
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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=1msk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1msk OCA], [https://pdbe.org/1msk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1msk RCSB], [https://www.ebi.ac.uk/pdbsum/1msk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1msk ProSAT]</span></td></tr>
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</table>
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== Function ==
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[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.
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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/ms/1msk_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=1msk ConSurf].
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<div style="clear:both"></div>
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'''METHIONINE SYNTHASE (ACTIVATION DOMAIN)'''
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==See Also==
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*[[Methionine synthase 3D structures|Methionine synthase 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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BACKGROUND: In both mammalian and microbial species, B12-dependent methionine synthase catalyzes methyl transfer from methyltetrahydrofolate (CH3-H4folate) to homocysteine. The B12 (cobalamin) cofactor plays an essential role in this reaction, accepting the methyl group from CH3-H4folate to form methylcob(III)alamin and in turn donating the methyl group to homocysteine to generate methionine and cob(I)alamin. Occasionally the highly reactive cob(I)alamin intermediate is oxidized to the catalytically inactive cob(II)alamin form. Reactivation to sustain enzyme activity is achieved by a reductive methylation, requiring S-adenosylmethionine (AdoMet) as the methyl donor and, in Esherichia coli, flavodoxin as an electron donor. The intact system is controlled and organized so that AdoMet, rather than methyltetrahydrofolate, is the methyl donor in the reactivation reaction. AdoMet is not wasted as a methyl donor in the catalytic cycle in which methionine is synthesized from homocysteine. The structures of the AdoMet binding site and the cobalamin-binding domains (previously determined) provide a starting point for understanding the methyl transfer reactions of methionine synthase. RESULTS: We report the crystal structure of the 38 kDa C-terminal fragment of E.coli methionine synthase that comprises the AdoMet-binding site and is essential for reactivation. The structure, which includes residues 901-1227 of methionine synthase, is a C-shaped single domain whose central feature is a bent antiparallel betasheet. Database searches indicate that the observed polypeptide has no close relatives. AdoMet binds near the center of the inner surface of the domain and is held in place by both side chain and backbone interactions. CONCLUSIONS: The conformation of bound AdoMet, and the interactions that determine its binding, differ from those found in other AdoMet-dependent enzymes. The sequence Arg-x-x-x-Gly-Tyr is critical for the binding of AdoMet to methionine synthase. The position of bound AdoMet suggests that large areas of the C-terminal and cobalamin-binding fragments must come in contact in order to transfer the methyl group of AdoMet to cobalamin. The catalytic and activation cycles may be turned off and on by alternating physical separation and approach of the reactants.
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[[Category: Escherichia coli K-12]]
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[[Category: Large Structures]]
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==About this Structure==
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[[Category: Dixon MM]]
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1MSK is a [[Single protein]] structure of 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=1MSK OCA].
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[[Category: Huang S]]
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[[Category: Ludwig ML]]
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==Reference==
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[[Category: Matthews RG]]
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The structure of the C-terminal domain of methionine synthase: presenting S-adenosylmethionine for reductive methylation of B12., Dixon MM, Huang S, Matthews RG, Ludwig M, Structure. 1996 Nov 15;4(11):1263-75. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8939751 8939751]
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[[Category: Escherichia coli]]
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[[Category: Methionine synthase]]
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[[Category: Single protein]]
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[[Category: Dixon, M M.]]
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[[Category: Huang, S.]]
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[[Category: Ludwig, M L.]]
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[[Category: Matthews, R G.]]
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[[Category: Methionine biosynthesis]]
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[[Category: Methyltransferase]]
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[[Category: Transferase]]
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[[Category: Vitamin b12]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 01:40:26 2008''
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METHIONINE SYNTHASE (ACTIVATION DOMAIN)

PDB ID 1msk

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