1b5t: Difference between revisions

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New page: left|200px<br /><applet load="1b5t" size="450" color="white" frame="true" align="right" spinBox="true" caption="1b5t, resolution 2.50Å" /> '''ESCHERICHIA COLI MET...
 
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[[Image:1b5t.gif|left|200px]]<br /><applet load="1b5t" size="450" color="white" frame="true" align="right" spinBox="true"
caption="1b5t, resolution 2.50&Aring;" />
'''ESCHERICHIA COLI METHYLENETETRAHYDROFOLATE REDUCTASE'''<br />


==Overview==
==ESCHERICHIA COLI METHYLENETETRAHYDROFOLATE REDUCTASE==
Elevated plasma homocysteine levels are associated with increased risk for, cardiovascular disease and neural tube defects in humans. Folate treatment, decreases homocysteine levels and dramatically reduces the incidence of, neural tube defects. The flavoprotein methylenetetrahydrofolate reductase, (MTHFR) is a likely target for these actions of folate. The most common, genetic cause of mildly elevated plasma homocysteine in humans is the, MTHFR polymorphism A222V (base change C677--&gt;T). The X-ray analysis of E., coli MTHFR, reported here, provides a model for the catalytic domain that, is shared by all MTHFRs. This domain is a beta8alpha8 barrel that binds, FAD in a novel fashion. Ala 177, corresponding to Ala 222 in human MTHFR, is near the bottom of the barrel and distant from the FAD. The mutation, A177V does not affect Km or k(cat) but instead increases the propensity, for bacterial MTHFR to lose its essential flavin cofactor. Folate, derivatives protect wild-type and mutant E. coli enzymes against flavin, loss, and protect human MTHFR and the A222V mutant against thermal, inactivation, suggesting a mechanism by which folate treatment reduces, homocysteine levels.
<StructureSection load='1b5t' size='340' side='right'caption='[[1b5t]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1b5t]] is a 3 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=1B5T OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1B5T 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=HG:MERCURY+(II)+ION'>HG</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=1b5t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1b5t OCA], [https://pdbe.org/1b5t PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1b5t RCSB], [https://www.ebi.ac.uk/pdbsum/1b5t PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1b5t ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/METF_ECOLI METF_ECOLI] Methylenetetrahydrofolate reductase required to generate the methyl groups necessary for methionine synthetase to convert homocysteine to methionine.<ref>PMID:14275142</ref>
== 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/b5/1b5t_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=1b5t ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1B5T is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with HG and FAD as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Deleted_entry Deleted entry], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.7.99.5 1.7.99.5] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1B5T OCA].
*[[Methylenetetrahydrofolate reductase 3D structures|Methylenetetrahydrofolate reductase 3D structures]]
 
== References ==
==Reference==
<references/>
The structure and properties of methylenetetrahydrofolate reductase from Escherichia coli suggest how folate ameliorates human hyperhomocysteinemia., Guenther BD, Sheppard CA, Tran P, Rozen R, Matthews RG, Ludwig ML, Nat Struct Biol. 1999 Apr;6(4):359-65. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10201405 10201405]
__TOC__
[[Category: Deleted entry]]
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Guenther, B.D.]]
[[Category: Guenther BD]]
[[Category: Ludwig, M.L.]]
[[Category: Ludwig ML]]
[[Category: Matthews, R.G.]]
[[Category: Matthews RG]]
[[Category: Rozen, R.]]
[[Category: Rozen R]]
[[Category: Sheppard, C.A.]]
[[Category: Sheppard CA]]
[[Category: Tran, P.]]
[[Category: Tran P]]
[[Category: FAD]]
[[Category: HG]]
[[Category: beta alpha barrel]]
[[Category: reductase]]
 
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 11:23:22 2007''

Latest revision as of 09:34, 7 February 2024

ESCHERICHIA COLI METHYLENETETRAHYDROFOLATE REDUCTASEESCHERICHIA COLI METHYLENETETRAHYDROFOLATE REDUCTASE

Structural highlights

1b5t is a 3 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.5Å
Ligands:,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

METF_ECOLI Methylenetetrahydrofolate reductase required to generate the methyl groups necessary for methionine synthetase to convert homocysteine to methionine.[1]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

References

  1. ↑ KATZEN HM, BUCHANAN JM. ENZYMATIC SYNTHESIS OF THE METHYL GROUP OF METHIONINE. 8. REPRESSION-DEREPRESSION, PURIFICATION, AND PROPERTIES OF 5,10-METHYLENETETRAHYDROFOLATE REDUCTASE FROM ESCHERICHIA COLI. J Biol Chem. 1965 Feb;240:825-35. PMID:14275142

1b5t, resolution 2.50Å

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