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[[Image:1cma.jpg|left|200px]]<br /><applet load="1cma" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1cma, resolution 2.800&Aring;" />
'''MET REPRESSOR/DNA COMPLEX + S-ADENOSYL-METHIONINE'''<br />


==Overview==
==MET REPRESSOR/DNA COMPLEX + S-ADENOSYL-METHIONINE==
The crystal structure of the met repressor-operator complex shows two dimeric repressor molecules bound to adjacent sites 8 base pairs apart on an 18-base-pair DNA fragment. Sequence specificity is achieved by insertion of double-stranded antiparallel protein beta-ribbons into the major groove of B-form DNA, with direct hydrogen-bonding between amino-acid side chains and the base pairs. The repressor also recognizes sequence-dependent distortion or flexibility of the operator phosphate backbone, conferring specificity even for inaccessible base pairs.
<StructureSection load='1cma' size='340' side='right'caption='[[1cma]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1cma]] is a 4 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=1CMA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CMA 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]] 2.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SAM:S-ADENOSYLMETHIONINE'>SAM</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=1cma FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cma OCA], [https://pdbe.org/1cma PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cma RCSB], [https://www.ebi.ac.uk/pdbsum/1cma PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cma ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/METJ_ECOLI METJ_ECOLI] This regulatory protein, when combined with SAM (S-adenosylmethionine) represses the expression of the methionine regulon and of enzymes involved in SAM synthesis. It is also autoregulated.[HAMAP-Rule:MF_00744]
== 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/cm/1cma_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=1cma ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1CMA 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 <scene name='pdbligand=SAM:'>SAM</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CMA OCA].
*[[Met repressor|Met repressor]]
 
__TOC__
==Reference==
</StructureSection>
Crystal structure of the met repressor-operator complex at 2.8 A resolution reveals DNA recognition by beta-strands., Somers WS, Phillips SE, Nature. 1992 Oct 1;359(6394):387-93. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=1406951 1406951]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Phillips, S E.V.]]
[[Category: Phillips SEV]]
[[Category: Somers, W S.]]
[[Category: Somers WS]]
[[Category: SAM]]
[[Category: double helix]]
[[Category: protein-dna complex]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:07:33 2008''

Latest revision as of 09:43, 7 February 2024

MET REPRESSOR/DNA COMPLEX + S-ADENOSYL-METHIONINEMET REPRESSOR/DNA COMPLEX + S-ADENOSYL-METHIONINE

Structural highlights

1cma is a 4 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 2.8Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

METJ_ECOLI This regulatory protein, when combined with SAM (S-adenosylmethionine) represses the expression of the methionine regulon and of enzymes involved in SAM synthesis. It is also autoregulated.[HAMAP-Rule:MF_00744]

Evolutionary Conservation

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

See Also

1cma, resolution 2.80Å

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