View source for 1leb


==SOLUTION STRUCTURE OF THE LEXA REPRESSOR DNA BINDING DETERMINED BY 1H NMR SPECTROSCOPY==
<StructureSection load='1leb' size='340' side='right'caption='[[1leb]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1leb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LEB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1LEB FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1leb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1leb OCA], [https://pdbe.org/1leb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1leb RCSB], [https://www.ebi.ac.uk/pdbsum/1leb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1leb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/LEXA_ECOLI LEXA_ECOLI] Represses a number of genes involved in the response to DNA damage (SOS response), including recA and lexA. Binds to the 16 bp palindromic sequence 5'-CTGTATATATATACAG-3'. In the presence of single-stranded DNA, RecA interacts with LexA causing an autocatalytic cleavage which disrupts the DNA-binding part of LexA, leading to derepression of the SOS regulon and eventually DNA repair.<ref>PMID:7027255</ref> <ref>PMID:7027256</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/le/1leb_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=1leb ConSurf].
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== Publication Abstract from PubMed ==
The structure of the 84 residue DNA binding domain of the Escherichia coli LexA repressor has been determined from NMR data using distance geometry and restrained molecular dynamics. The assignment of the 1H NMR spectrum of the molecule, derived from 2- and 3-D homonuclear experiments, is also reported. A total of 613 non-redundant distance restraints were used to give a final family of 28 structures. The structured region of the molecule consisted of residues 4-69 and yielded a r.m.s. deviation from an average of 0.9 A for backbone and 1.6 A for all heavy atoms. The structure contains three regular alpha-helices at residues 6-21 (I), 28-35 (II) and 41-52 (III), and an antiparallel beta-sheet at residues 56-58 and 66-68. Helices II and III form a variant helix-turn-helix DNA binding motif, with an unusual one residue insert at residue 38. The topology of the LexA DNA binding domain is found to be the same as for the DNA binding domains of the catabolic activator protein, human histone 5, the HNF-3/fork head protein and the Kluyveromyces lactis heat shock transcription factor.

Solution structure of the LexA repressor DNA binding domain determined by 1H NMR spectroscopy.,Fogh RH, Ottleben G, Ruterjans H, Schnarr M, Boelens R, Kaptein R EMBO J. 1994 Sep 1;13(17):3936-44. PMID:8076591<ref>PMID:8076591</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1leb" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Boelens R]]
[[Category: Fogh RH]]
[[Category: Kaptein R]]
[[Category: Ottleben G]]
[[Category: Rueterjans H]]
[[Category: Schnarr M]]