1lbg

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[[Image:1lbg.gif|left|200px]]
 
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==LACTOSE OPERON REPRESSOR BOUND TO 21-BASE PAIR SYMMETRIC OPERATOR DNA, ALPHA CARBONS ONLY==
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The line below this paragraph, containing "STRUCTURE_1lbg", creates the "Structure Box" on the page.
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<StructureSection load='1lbg' size='340' side='right'caption='[[1lbg]], [[Resolution|resolution]] 4.80&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1lbg]] is a 8 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=1LBG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1LBG FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 4.8&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1lbg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lbg OCA], [https://pdbe.org/1lbg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1lbg RCSB], [https://www.ebi.ac.uk/pdbsum/1lbg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1lbg ProSAT]</span></td></tr>
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{{STRUCTURE_1lbg| PDB=1lbg | SCENE= }}
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/LACI_ECOLI LACI_ECOLI] Repressor of the lactose operon. Binds allolactose as an inducer.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/lb/1lbg_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1lbg ConSurf].
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<div style="clear:both"></div>
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'''LACTOSE OPERON REPRESSOR BOUND TO 21-BASE PAIR SYMMETRIC OPERATOR DNA, ALPHA CARBONS ONLY'''
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==See Also==
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*[[Lac repressor|Lac repressor]]
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__TOC__
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==Overview==
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</StructureSection>
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The lac operon of Escherichia coli is the paradigm for gene regulation. Its key component is the lac repressor, a product of the lacI gene. The three-dimensional structures of the intact lac repressor, the lac repressor bound to the gratuitous inducer isopropyl-beta-D-1-thiogalactoside (IPTG) and the lac repressor complexed with a 21-base pair symmetric operator DNA have been determined. These three structures show the conformation of the molecule in both the induced and repressed states and provide a framework for understanding a wealth of biochemical and genetic information. The DNA sequence of the lac operon has three lac repressor recognition sites in a stretch of 500 base pairs. The crystallographic structure of the complex with DNA suggests that the tetrameric repressor functions synergistically with catabolite gene activator protein (CAP) and participates in the quaternary formation of repression loops in which one tetrameric repressor interacts simultaneously with two sites on the genomic DNA.
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==About this Structure==
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1LBG is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LBG OCA].
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==Reference==
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Crystal structure of the lactose operon repressor and its complexes with DNA and inducer., Lewis M, Chang G, Horton NC, Kercher MA, Pace HC, Schumacher MA, Brennan RG, Lu P, Science. 1996 Mar 1;271(5253):1247-54. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8638105 8638105]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Chang, G.]]
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[[Category: Chang G]]
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[[Category: Horton, N C.]]
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[[Category: Horton NC]]
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[[Category: Kercher, M A.]]
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[[Category: Kercher MA]]
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[[Category: Lewis, M.]]
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[[Category: Lewis M]]
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[[Category: Lu, P.]]
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[[Category: Lu P]]
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[[Category: Pace, H C.]]
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[[Category: Pace HC]]
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[[Category: Dna-binding]]
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[[Category: Repressor]]
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[[Category: Transcription regulation]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 23:45:25 2008''
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Current revision

LACTOSE OPERON REPRESSOR BOUND TO 21-BASE PAIR SYMMETRIC OPERATOR DNA, ALPHA CARBONS ONLY

PDB ID 1lbg

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