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| | ==crystal structure of QacR(E58Q) bound to malachite green== | | ==crystal structure of QacR(E58Q) bound to malachite green== |
| - | <StructureSection load='3btl' size='340' side='right' caption='[[3btl]], [[Resolution|resolution]] 2.90Å' scene=''> | + | <StructureSection load='3btl' size='340' side='right'caption='[[3btl]], [[Resolution|resolution]] 2.90Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3btl]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3BTL OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3BTL FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3btl]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Staphylococcus_aureus_subsp._aureus_Mu50 Staphylococcus aureus subsp. aureus Mu50]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3BTL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3BTL FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MGR:MALACHITE+GREEN'>MGR</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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]] 2.9Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1jt6|1jt6]], [[3bt9|3bt9]], [[3btc|3btc]], [[3bti|3bti]], [[3btj|3btj]], [[1jup|1jup]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MGR:MALACHITE+GREEN'>MGR</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">qacR ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1280 Staphylococcus aureus])</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=3btl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3btl OCA], [https://pdbe.org/3btl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3btl RCSB], [https://www.ebi.ac.uk/pdbsum/3btl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3btl 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=3btl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3btl OCA], [http://pdbe.org/3btl PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3btl RCSB], [http://www.ebi.ac.uk/pdbsum/3btl PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3btl ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/QACR_STAAM QACR_STAAM]] Transcriptional repressor of qacA. Binds to IR1, an unusually long 28 bp operator, which is located downstream from the qacA promoter and overlaps its transcription start site. QacR is induced from its IR1 site by binding to one of many structurally dissimilar cationic lipophilic compounds, which are also substrates of QacA (By similarity). | + | [https://www.uniprot.org/uniprot/QACR_STAAM QACR_STAAM] Transcriptional repressor of qacA. Binds to IR1, an unusually long 28 bp operator, which is located downstream from the qacA promoter and overlaps its transcription start site. QacR is induced from its IR1 site by binding to one of many structurally dissimilar cationic lipophilic compounds, which are also substrates of QacA (By similarity). |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | </div> | | </div> |
| | <div class="pdbe-citations 3btl" style="background-color:#fffaf0;"></div> | | <div class="pdbe-citations 3btl" style="background-color:#fffaf0;"></div> |
| | + | |
| | + | ==See Also== |
| | + | *[[Tetracycline repressor protein 3D structures|Tetracycline repressor protein 3D structures]] |
| | + | *[[Transcriptional activator 3D structures|Transcriptional activator 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Staphylococcus aureus]] | + | [[Category: Large Structures]] |
| - | [[Category: Brennan, R G]] | + | [[Category: Staphylococcus aureus subsp. aureus Mu50]] |
| - | [[Category: Schumacher, M A]] | + | [[Category: Brennan RG]] |
| - | [[Category: Schuman, J T]] | + | [[Category: Schumacher MA]] |
| - | [[Category: Dna-binding]] | + | [[Category: Schuman JT]] |
| - | [[Category: Dye]]
| + | |
| - | [[Category: Malachite green]]
| + | |
| - | [[Category: Multidrug binding]]
| + | |
| - | [[Category: Plasmid]]
| + | |
| - | [[Category: Qacr]]
| + | |
| - | [[Category: Repressor]]
| + | |
| - | [[Category: Transcription]]
| + | |
| - | [[Category: Transcription regulation]]
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| Structural highlights
Function
QACR_STAAM Transcriptional repressor of qacA. Binds to IR1, an unusually long 28 bp operator, which is located downstream from the qacA promoter and overlaps its transcription start site. QacR is induced from its IR1 site by binding to one of many structurally dissimilar cationic lipophilic compounds, which are also substrates of QacA (By similarity).
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
The Staphylococcus aureus multidrug binding protein QacR binds to a broad spectrum of structurally dissimilar cationic, lipophilic drugs. Our previous structural analyses suggested that five QacR glutamic acid residues are critical for charge neutralization and specification of certain drugs. For example, E57 and E58 interact with berberine and with one of the positively charged moieties of the bivalent drug dequalinium. Here we report the structural and biochemical effects of substituting E57 and E58 with alanine and glutamine. Unexpectedly, individual substitutions of these residues did not significantly affect QacR drug binding affinity. Structures of QacR(E57Q) and QacR(E58Q) bound to dequalinium indicated that E57 and E58 are redundant for charge neutralization. The most significant finding was that berberine was reoriented in the QacR multidrug binding pocket so that its positive charge was neutralized by side chain oxygen atoms and aromatic residues. Together, these data emphasize the remarkable versatility of the QacR multidrug binding pocket, illustrating that the capacity of QacR to bind myriad cationic drugs is largely governed by the presence in the pocket of a redundancy of polar, charged, and aromatic residues that are capable of electrostatic neutralization.
QacR-cation recognition is mediated by a redundancy of residues capable of charge neutralization.,Peters KM, Schuman JT, Skurray RA, Brown MH, Brennan RG, Schumacher MA Biochemistry. 2008 Aug 5;47(31):8122-9. Epub 2008 Jul 11. PMID:18616285[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Peters KM, Schuman JT, Skurray RA, Brown MH, Brennan RG, Schumacher MA. QacR-cation recognition is mediated by a redundancy of residues capable of charge neutralization. Biochemistry. 2008 Aug 5;47(31):8122-9. Epub 2008 Jul 11. PMID:18616285 doi:http://dx.doi.org/10.1021/bi8008246
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