+Open data
-Basic information
Entry | Database: PDB / ID: 7b5u | |||||||||
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Title | RCK_C domain dimer of S.agalactiae BusR in complex with c-di-AMP | |||||||||
Components | GntR family transcriptional regulator | |||||||||
Keywords | DNA BINDING PROTEIN / effector binding domain / RCK_C | |||||||||
Function / homology | Function and homology information monoatomic cation transmembrane transporter activity / potassium ion transport / DNA-binding transcription factor activity Similarity search - Function | |||||||||
Biological species | Streptococcus agalactiae (bacteria) | |||||||||
Method | X-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 1.2 Å | |||||||||
Authors | Bandera, A.M. / Witte, G. | |||||||||
Funding support | Germany, 2items
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Citation | Journal: Nucleic Acids Res / Year: 2021 Title: BusR senses bipartite DNA binding motifs by a unique molecular ruler architecture. Authors: Adrian M Bandera / Joseph Bartho / Katja Lammens / David Jan Drexler / Jasmin Kleinschwärzer / Karl-Peter Hopfner / Gregor Witte / Abstract: The cyclic dinucleotide second messenger c-di-AMP is a major player in regulation of potassium homeostasis and osmolyte transport in a variety of bacteria. Along with various direct interactions with ...The cyclic dinucleotide second messenger c-di-AMP is a major player in regulation of potassium homeostasis and osmolyte transport in a variety of bacteria. Along with various direct interactions with proteins such as potassium channels, the second messenger also specifically binds to transcription factors, thereby altering the processes in the cell on the transcriptional level. We here describe the structural and biochemical characterization of BusR from the human pathogen Streptococcus agalactiae. BusR is a member of a yet structurally uncharacterized subfamily of the GntR family of transcription factors that downregulates transcription of the genes for the BusA (OpuA) glycine-betaine transporter upon c-di-AMP binding. We report crystal structures of full-length BusR, its apo and c-di-AMP bound effector domain, as well as cryo-EM structures of BusR bound to its operator DNA. Our structural data, supported by biochemical and biophysical data, reveal that BusR utilizes a unique domain assembly with a tetrameric coiled-coil in between the binding platforms, serving as a molecular ruler to specifically recognize a 22 bp separated bipartite binding motif. Binding of c-di-AMP to BusR induces a shift in equilibrium from an inactivated towards an activated state that allows BusR to bind the target DNA, leading to transcriptional repression. | |||||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 7b5u.cif.gz | 85.5 KB | Display | PDBx/mmCIF format |
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PDB format | pdb7b5u.ent.gz | 61.6 KB | Display | PDB format |
PDBx/mmJSON format | 7b5u.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/b5/7b5u ftp://data.pdbj.org/pub/pdb/validation_reports/b5/7b5u | HTTPS FTP |
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-Related structure data
Related structure data | 7b5tSC 7b5wC 7b5yC 7oz3C S: Starting model for refinement C: citing same article (ref.) |
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Similar structure data | |
Other databases |
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-Links
-Assembly
Deposited unit |
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1 |
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Unit cell |
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-Components
#1: Protein | Mass: 9014.149 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Details: G133 results from N-terminal tag / Source: (gene. exp.) Streptococcus agalactiae (bacteria) Gene: BM110_ORF1201, AX245_01365, C6N10_09995, F5043_05515, GD434_05225, RDF_1124 Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: K0JNC6 #2: Chemical | ChemComp-2BA / ( | #3: Water | ChemComp-HOH / | Has ligand of interest | Y | |
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-Experimental details
-Experiment
Experiment | Method: X-RAY DIFFRACTION / Number of used crystals: 1 |
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-Sample preparation
Crystal | Density Matthews: 1.96 Å3/Da / Density % sol: 37.25 % |
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Crystal grow | Temperature: 298 K / Method: vapor diffusion, hanging drop / pH: 4.6 / Details: 100 mM Na-acetate, 3% (w/v) PEG4000 |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: SYNCHROTRON / Site: PETRA III, EMBL c/o DESY / Beamline: P14 (MX2) / Wavelength: 0.9763 Å |
Detector | Type: DECTRIS EIGER X 16M / Detector: PIXEL / Date: Jun 29, 2020 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.9763 Å / Relative weight: 1 |
Reflection | Resolution: 1.2→17.67 Å / Num. obs: 41497 / % possible obs: 95.4 % / Redundancy: 6.9 % / Biso Wilson estimate: 11.49 Å2 / CC1/2: 0.99 / Rrim(I) all: 0.034 / Net I/σ(I): 33.3 |
Reflection shell | Resolution: 1.2→1.23 Å / Mean I/σ(I) obs: 14.86 / Num. unique obs: 2859 / CC1/2: 0.993 / Rrim(I) all: 0.11 |
-Processing
Software |
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Refinement | Method to determine structure: MOLECULAR REPLACEMENT Starting model: 7B5T Resolution: 1.2→17.67 Å / SU ML: 0.07 / Cross valid method: THROUGHOUT / σ(F): 1.43 / Phase error: 14.94 / Stereochemistry target values: ML
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso max: 58.48 Å2 / Biso mean: 12.8787 Å2 / Biso min: 4.2 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: final / Resolution: 1.2→17.67 Å
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LS refinement shell | Refine-ID: X-RAY DIFFRACTION / Rfactor Rfree error: 0 / Total num. of bins used: 14
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