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2xgc

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{{Seed}}
 
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[[Image:2xgc.jpg|left|200px]]
 
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==Crystal structure of a designed heterodimeric variant T-A(I)B of the tetracycline repressor==
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The line below this paragraph, containing "STRUCTURE_2xgc", creates the "Structure Box" on the page.
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<StructureSection load='2xgc' size='340' side='right'caption='[[2xgc]], [[Resolution|resolution]] 2.15&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'>[[2xgc]] is a 2 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=2XGC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2XGC 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]] 2.15&#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=2xgc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2xgc OCA], [https://pdbe.org/2xgc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2xgc RCSB], [https://www.ebi.ac.uk/pdbsum/2xgc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2xgc ProSAT]</span></td></tr>
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{{STRUCTURE_2xgc| PDB=2xgc | SCENE= }}
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/TETR2_ECOLX TETR2_ECOLX] TetR is the repressor of the tetracycline resistance element; its N-terminal region forms a helix-turn-helix structure and binds DNA. Binding of tetracycline to TetR reduces the repressor affinity for the tetracycline resistance gene (tetA) promoter operator sites.[https://www.uniprot.org/uniprot/TETR4_ECOLX TETR4_ECOLX] TetR is the repressor of the tetracycline resistance element; its N-terminal region forms a helix-turn-helix structure and binds DNA. Binding of tetracycline to TetR reduces the repressor affinity for the tetracycline resistance gene (tetA) promoter operator sites.
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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/xg/2xgc_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=2xgc ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The specificity and selectivity of protein-protein interactions are of central importance for many biological processes, including signal transduction and transcription control. We used the in-house side-chain packing program MUMBO to computationally design a chain-specific heterodimeric variant of the bacterial transcription regulator tetracycline repressor (TetR), called T-A(A)B. Our goal was to engineer two different TetR chain variants, A and B, that no longer interact as AA or BB homodimers but selectively recombine to form heterodimers. Although 56 residues from each chain contribute to a dimer interface as large as 2200 A(2) in wild-type TetR, the substitution of only three residues in one chain and two residues in a second chain sufficed for generating specificity in a T-A(A)B heterodimer variant. The design was corroborated in vivo by a cell-based transcription assay, and in vitro by CD spectroscopy and X-ray crystallography. Crystal structure analyses showed that while selectivity in the B chain is achieved entirely through van der Waals repulsion, the best selectivity in the A chain is obtained for the variant with the lowest number of atoms in the interface, thus possibly leading to underpacking of the dimer interface. This results in a marked decrease in thermal stability and a drastic reduction in the solubility of the T-A(A)A(A) homodimer in comparison to the designed T-A(A)B heterodimer variant.
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===CRYSTAL STRUCTURE OF A DESIGNED HETERODIMERIC VARIANT T-A(I) B OF THE TETRACYCLINE REPRESSOR===
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Computational Design of a Chain-Specific Tetracycline Repressor Heterodimer.,Stiebritz MT, Wengrzik S, Klein DL, Richter JP, Srebrzynski A, Weiler S, Muller YA J Mol Biol. 2010 Sep 10. PMID:20816982<ref>PMID:20816982</ref>
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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 2xgc" style="background-color:#fffaf0;"></div>
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==See Also==
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The line below this paragraph, {{ABSTRACT_PUBMED_20816982}}, adds the Publication Abstract to the page
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*[[Tetracycline repressor protein 3D structures|Tetracycline repressor protein 3D structures]]
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(as it appears on PubMed at http://www.pubmed.gov), where 20816982 is the PubMed ID number.
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== References ==
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<references/>
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{{ABSTRACT_PUBMED_20816982}}
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__TOC__
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</StructureSection>
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==About this Structure==
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2XGC is a 2 chains structure with sequences 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=2XGC OCA].
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==Reference==
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<ref group="xtra">PMID:20816982</ref><references group="xtra"/>
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Muller, Y A.]]
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[[Category: Large Structures]]
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[[Category: Richter, J P.]]
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[[Category: Muller YA]]
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[[Category: Stiebritz, M T.]]
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[[Category: Richter JP]]
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[[Category: Wengrzik, S.]]
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[[Category: Stiebritz MT]]
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[[Category: Antibiotic resistance]]
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[[Category: Wengrzik S]]
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[[Category: Chimera]]
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[[Category: Transcription]]
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[[Category: Transcription regulation]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Sep 22 14:42:56 2010''
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Current revision

Crystal structure of a designed heterodimeric variant T-A(I)B of the tetracycline repressor

PDB ID 2xgc

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