4rzt

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==Lac repressor engineered to bind sucralose, sucralose-bound tetramer==
==Lac repressor engineered to bind sucralose, sucralose-bound tetramer==
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<StructureSection load='4rzt' size='340' side='right' caption='[[4rzt]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
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<StructureSection load='4rzt' size='340' side='right'caption='[[4rzt]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[4rzt]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Ecod1 Ecod1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4RZT OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4RZT FirstGlance]. <br>
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<table><tr><td colspan='2'>[[4rzt]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_DH1 Escherichia coli DH1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4RZT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4RZT FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=40J:1,6-DICHLORO-1,6-DIDEOXY-BETA-D-FRUCTOFURANOSYL+4-CHLORO-4-DEOXY-ALPHA-D-GALACTOPYRANOSIDE'>40J</scene></td></tr>
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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]] 3.1&#8491;</td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4rzs|4rzs]]</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PRD_900090:sucralose'>PRD_900090</scene>, <scene name='pdbligand=RRJ:4-chloro-4-deoxy-alpha-D-galactopyranose'>RRJ</scene>, <scene name='pdbligand=RRY:1,6-dichloro-1,6-dideoxy-beta-D-fructofuranose'>RRY</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">b0345, ECDH1ME8569_0332, EcDH1_3261, lacI ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=536056 ECOD1])</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=4rzt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4rzt OCA], [https://pdbe.org/4rzt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4rzt RCSB], [https://www.ebi.ac.uk/pdbsum/4rzt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4rzt ProSAT]</span></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4rzt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4rzt OCA], [http://pdbe.org/4rzt PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4rzt RCSB], [http://www.ebi.ac.uk/pdbsum/4rzt PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4rzt ProSAT]</span></td></tr>
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</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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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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Genetic regulatory proteins inducible by small molecules are useful synthetic biology tools as sensors and switches. Bacterial allosteric transcription factors (aTFs) are a major class of regulatory proteins, but few aTFs have been redesigned to respond to new effectors beyond natural aTF-inducer pairs. Altering inducer specificity in these proteins is difficult because substitutions that affect inducer binding may also disrupt allostery. We engineered an aTF, the Escherichia coli lac repressor, LacI, to respond to one of four new inducer molecules: fucose, gentiobiose, lactitol and sucralose. Using computational protein design, single-residue saturation mutagenesis or random mutagenesis, along with multiplex assembly, we identified new variants comparable in specificity and induction to wild-type LacI with its inducer, isopropyl beta-D-1-thiogalactopyranoside (IPTG). The ability to create designer aTFs will enable applications including dynamic control of cell metabolism, cell biology and synthetic gene circuits.
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Engineering an allosteric transcription factor to respond to new ligands.,Taylor ND, Garruss AS, Moretti R, Chan S, Arbing MA, Cascio D, Rogers JK, Isaacs FJ, Kosuri S, Baker D, Fields S, Church GM, Raman S Nat Methods. 2015 Dec 21. doi: 10.1038/nmeth.3696. PMID:26689263<ref>PMID:26689263</ref>
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==See Also==
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*[[Lac repressor|Lac repressor]]
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 4rzt" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Ecod1]]
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[[Category: Escherichia coli DH1]]
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[[Category: Arbing, M A]]
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[[Category: Large Structures]]
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[[Category: Cascio, D]]
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[[Category: Arbing MA]]
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[[Category: Church, G M]]
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[[Category: Cascio D]]
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[[Category: Kosuri, S]]
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[[Category: Church GM]]
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[[Category: Sawaya, M R]]
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[[Category: Kosuri S]]
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[[Category: Allostery]]
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[[Category: Sawaya MR]]
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[[Category: Escherichia coli]]
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[[Category: Lac repressor]]
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[[Category: Laci]]
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[[Category: Lactose operon repressor]]
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[[Category: Protein design]]
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[[Category: Sucralose]]
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[[Category: Transcription]]
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Current revision

Lac repressor engineered to bind sucralose, sucralose-bound tetramer

PDB ID 4rzt

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