1lt7: Difference between revisions

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[[Image:1lt7.jpg|left|200px]]


<!--
==Oxidized Homo sapiens betaine-homocysteine S-methyltransferase in complex with four Sm(III) ions==
The line below this paragraph, containing "STRUCTURE_1lt7", creates the "Structure Box" on the page.
<StructureSection load='1lt7' size='340' side='right'caption='[[1lt7]], [[Resolution|resolution]] 2.15&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[1lt7]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LT7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1LT7 FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.15&#8491;</td></tr>
-->
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CIT:CITRIC+ACID'>CIT</scene>, <scene name='pdbligand=SM:SAMARIUM+(III)+ION'>SM</scene></td></tr>
{{STRUCTURE_1lt7|  PDB=1lt7  |  SCENE= }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1lt7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lt7 OCA], [https://pdbe.org/1lt7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1lt7 RCSB], [https://www.ebi.ac.uk/pdbsum/1lt7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1lt7 ProSAT]</span></td></tr>
 
</table>
'''Oxidized Homo sapiens betaine-homocysteine S-methyltransferase in complex with four Sm(III) ions'''
== Function ==
 
[https://www.uniprot.org/uniprot/BHMT1_HUMAN BHMT1_HUMAN] Involved in the regulation of homocysteine metabolism. Converts betaine and homocysteine to dimethylglycine and methionine, respectively. This reaction is also required for the irreversible oxidation of choline.
 
== Evolutionary Conservation ==
==Overview==
[[Image:Consurf_key_small.gif|200px|right]]
Betaine-homocysteine methyl transferase (BHMT) catalyzes the synthesis of methionine from betaine and homocysteine (Hcy), utilizing a zinc ion to activate Hcy. BHMT is a key liver enzyme that is important for homocysteine homeostasis. X-ray structures of human BHMT in its oxidized (Zn-free) and reduced (Zn-replete) forms, the latter in complex with the bisubstrate analog, S(delta-carboxybutyl)-L-homocysteine, were determined at resolutions of 2.15 A and 2.05 A. BHMT is a (beta/alpha)(8) barrel that is distorted to construct the substrate and metal binding sites. The zinc binding sequences G-V/L-N-C and G-G-C-C are at the C termini of strands beta6 and beta8. Oxidation to the Cys217-Cys299 disulfide and expulsion of Zn are accompanied by local rearrangements. The structures identify Hcy binding fingerprints and provide a prototype for the homocysteine S-methyltransferase family.
Check<jmol>
 
  <jmolCheckbox>
==About this Structure==
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/lt/1lt7_consurf.spt"</scriptWhenChecked>
1LT7 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LT7 OCA].  
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
 
    <text>to colour the structure by Evolutionary Conservation</text>
==Reference==
  </jmolCheckbox>
Betaine-homocysteine methyltransferase: zinc in a distorted barrel., Evans JC, Huddler DP, Jiracek J, Castro C, Millian NS, Garrow TA, Ludwig ML, Structure. 2002 Sep;10(9):1159-71. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12220488 12220488]
</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=1lt7 ConSurf].
[[Category: Betaine--homocysteine S-methyltransferase]]
<div style="clear:both"></div>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Castro, C.]]
[[Category: Castro C]]
[[Category: Evans, J C.]]
[[Category: Evans JC]]
[[Category: Garrow, T A.]]
[[Category: Garrow TA]]
[[Category: Huddler, D P.]]
[[Category: Huddler DP]]
[[Category: Jiracek, J.]]
[[Category: Jiracek J]]
[[Category: Ludwig, M L.]]
[[Category: Ludwig ML]]
[[Category: Millian, N S.]]
[[Category: Millian NS]]
[[Category: Homocysteine metabolism]]
[[Category: Homocysteinemia]]
[[Category: Thiol alkyl transfer]]
[[Category: Transferase]]
[[Category: Zinc]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 00:15:51 2008''

Latest revision as of 08:27, 10 April 2024

Oxidized Homo sapiens betaine-homocysteine S-methyltransferase in complex with four Sm(III) ions

1lt7, resolution 2.15Å

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