View source for 1l1m


==SOLUTION STRUCTURE OF A DIMER OF LAC REPRESSOR DNA-BINDING DOMAIN COMPLEXED TO ITS NATURAL OPERATOR O1==
<StructureSection load='1l1m' size='340' side='right'caption='[[1l1m]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1l1m]] is a 4 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=1L1M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1L1M FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 20 models</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=1l1m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1l1m OCA], [https://pdbe.org/1l1m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1l1m RCSB], [https://www.ebi.ac.uk/pdbsum/1l1m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1l1m ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/LACI_ECOLI LACI_ECOLI] Repressor of the lactose operon. Binds allolactose as an inducer.
== 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/l1/1l1m_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1l1m ConSurf].
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== Publication Abstract from PubMed ==
The lac repressor-operator system is a model system for understanding protein-DNA interactions and allosteric mechanisms in gene regulation. Despite the wealth of biochemical data provided by extensive mutations of both repressor and operator, the specific recognition mechanism of the natural lac operators by lac repressor has remained elusive. Here we present the first high-resolution structure of a dimer of the DNA-binding domain of lac repressor bound to its natural operator 01. The global positioning of the dimer on the operator is dramatically asymmetric, which results in a different pattern of specific contacts between the two sites. Specific recognition is accomplished by a combination of elongation and twist by 48 degrees of the right lac subunit relative to the left one, significant rearrangement of many side chains as well as sequence-dependent deformability of the DNA. The set of recognition mechanisms involved in the lac repressor-operator system is unique among other protein-DNA complexes and presents a nice example of the adaptability that both proteins and DNA exhibit in the context of their mutual interaction.

Plasticity in protein-DNA recognition: lac repressor interacts with its natural operator 01 through alternative conformations of its DNA-binding domain.,Kalodimos CG, Bonvin AM, Salinas RK, Wechselberger R, Boelens R, Kaptein R EMBO J. 2002 Jun 17;21(12):2866-76. PMID:12065400<ref>PMID:12065400</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 1l1m" style="background-color:#fffaf0;"></div>

==See Also==
*[[Lac repressor|Lac repressor]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Boelens R]]
[[Category: Bonvin AMJJ]]
[[Category: Kalodimos CG]]
[[Category: Kaptein R]]
[[Category: Salinas RK]]
[[Category: Wechselberger R]]