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| | ==Crystal structure of E253A mutant of BMRR bound to 22-bp oligonucleotide== | | ==Crystal structure of E253A mutant of BMRR bound to 22-bp oligonucleotide== |
| - | <StructureSection load='3d70' size='340' side='right' caption='[[3d70]], [[Resolution|resolution]] 2.80Å' scene=''> | + | <StructureSection load='3d70' size='340' side='right'caption='[[3d70]], [[Resolution|resolution]] 2.80Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3d70]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3D70 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3D70 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3d70]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3D70 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3D70 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1bow|1bow]], [[2bow|2bow]], [[3d6z|3d6z]], [[3d6y|3d6y]], [[1r8e|1r8e]], [[1exj|1exj]], [[3d71|3d71]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">bmrR, bmr1R ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1423 Bacillus subtilis])</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=3d70 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3d70 OCA], [https://pdbe.org/3d70 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3d70 RCSB], [https://www.ebi.ac.uk/pdbsum/3d70 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3d70 ProSAT]</span></td></tr> |
| - | <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=3d70 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3d70 OCA], [http://pdbe.org/3d70 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3d70 RCSB], [http://www.ebi.ac.uk/pdbsum/3d70 PDBsum]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/BMRR_BACSU BMRR_BACSU]] Activates transcription of the bmr gene in response to structurally dissimilar drugs. Binds rhodamine as an inducer. | + | [https://www.uniprot.org/uniprot/BMRR_BACSU BMRR_BACSU] Activates transcription of the bmr gene in response to structurally dissimilar drugs. Binds rhodamine as an inducer. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
| | Check<jmol> | | Check<jmol> |
| | <jmolCheckbox> | | <jmolCheckbox> |
| - | <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/d7/3d70_consurf.spt"</scriptWhenChecked> | + | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/d7/3d70_consurf.spt"</scriptWhenChecked> |
| | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> |
| | <text>to colour the structure by Evolutionary Conservation</text> | | <text>to colour the structure by Evolutionary Conservation</text> |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Bacillus subtilis]] | | [[Category: Bacillus subtilis]] |
| - | [[Category: Brennan, R G]] | + | [[Category: Large Structures]] |
| - | [[Category: Newberry, K J]] | + | [[Category: Synthetic construct]] |
| - | [[Category: Activator]] | + | [[Category: Brennan RG]] |
| - | [[Category: Dna-binding]] | + | [[Category: Newberry KJ]] |
| - | [[Category: Multidrug resistance]]
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| - | [[Category: Protein-dna complex]]
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| - | [[Category: Transcription regulation]]
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| - | [[Category: Transcription regulator-dna complex]]
| + | |
| Structural highlights
Function
BMRR_BACSU Activates transcription of the bmr gene in response to structurally dissimilar drugs. Binds rhodamine as an inducer.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
BmrR is a member of the MerR family and a multidrug binding transcription factor that up-regulates the expression of the bmr multidrug efflux transporter gene in response to myriad lipophilic cationic compounds. The structural mechanism by which BmrR binds these chemically and structurally different drugs and subsequently activates transcription is poorly understood. Here, we describe the crystal structures of BmrR bound to rhodamine 6G (R6G) or berberine (Ber) and cognate DNA. These structures reveal each drug stacks against multiple aromatic residues with their positive charges most proximal to the carboxylate group of Glu-253 and that, unlike other multidrug binding pockets, that of BmrR is rigid. Substitution of Glu-253 with either alanine (E253A) or glutamine (E253Q) results in unpredictable binding affinities for R6G, Ber, and tetraphenylphosphonium. Moreover, these drug binding studies reveal that the negative charge of Glu-253 is not important for high affinity binding to Ber and tetraphenylphosphonium but plays a more significant, but unpredictable, role in R6G binding. In vitro transcription data show that E253A and E253Q are constitutively active, and structures of the drug-free E253A-DNA and E253Q-DNA complexes support a transcription activation mechanism requiring the expulsion of Tyr-152 from the multidrug binding pocket. In sum, these data delineate the mechanism by which BmrR binds lipophilic, monovalent cationic compounds and suggest the importance of the redundant negative electrostatic nature of this rigid drug binding pocket that can be used to discriminate against molecules that are not substrates of the Bmr multidrug efflux pump.
Structures of BmrR-drug complexes reveal a rigid multidrug binding pocket and transcription activation through tyrosine expulsion.,Newberry KJ, Huffman JL, Miller MC, Vazquez-Laslop N, Neyfakh AA, Brennan RG J Biol Chem. 2008 Sep 26;283(39):26795-804. Epub 2008 Jul 25. PMID:18658145[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Newberry KJ, Huffman JL, Miller MC, Vazquez-Laslop N, Neyfakh AA, Brennan RG. Structures of BmrR-drug complexes reveal a rigid multidrug binding pocket and transcription activation through tyrosine expulsion. J Biol Chem. 2008 Sep 26;283(39):26795-804. Epub 2008 Jul 25. PMID:18658145 doi:10.1074/jbc.M804191200
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