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Open data
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Basic information
Entry | Database: PDB / ID: 7b5w | |||||||||
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Title | RCK_C domain of S.agalactiae BusR in ligand-free state | |||||||||
![]() | GntR family transcriptional regulator | |||||||||
![]() | DNA BINDING PROTEIN / effector binding domain / RCK_C | |||||||||
Function / homology | ![]() monoatomic cation transmembrane transporter activity / potassium ion transport / DNA-binding transcription factor activity Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ![]() ![]() ![]() ![]() | |||||||||
![]() | Bandera, A.M. / Witte, G. | |||||||||
Funding support | ![]()
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![]() | ![]() 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: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 72 KB | Display | ![]() |
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PDB format | ![]() | 53.3 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 421 KB | Display | ![]() |
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Full document | ![]() | 422 KB | Display | |
Data in XML | ![]() | 6.8 KB | Display | |
Data in CIF | ![]() | 9 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7b5tSC ![]() 7b5uC ![]() 7b5yC ![]() 7oz3C C: citing same article ( S: Starting model for refinement |
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Similar structure data | |
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Assembly
Deposited unit | ![]()
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1 | ![]()
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Unit cell |
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Components on special symmetry positions |
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Components
#1: Protein | Mass: 11004.401 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Details: N-terminal residues MAHHHHHHSAALEVLFQG belong to purification tag Source: (gene. exp.) ![]() Gene: BM110_ORF1201, DX05_06300, F5F86_05185, NCTC6175_01043 Production host: ![]() ![]() |
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#2: Water | ChemComp-HOH / |
-Experimental details
-Experiment
Experiment | Method: ![]() |
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Sample preparation
Crystal | Density Matthews: 1.7 Å3/Da / Density % sol: 27.46 % |
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Crystal grow | Temperature: 298 K / Method: vapor diffusion, hanging drop / pH: 6.5 / Details: 100 mM Bis-Tris, 18% (w/v) PEG MME 5000 |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: ![]() ![]() ![]() |
Detector | Type: DECTRIS PILATUS 6M-F / Detector: PIXEL / Date: Jun 27, 2019 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.9 Å / Relative weight: 1 |
Reflection | Resolution: 1→18.03 Å / Num. obs: 39372 / % possible obs: 99.1 % / Redundancy: 6.4 % / CC1/2: 1 / Net I/σ(I): 21.6 |
Reflection shell | Resolution: 1→1.04 Å / Redundancy: 5.3 % / Num. unique obs: 2881 / CC1/2: 0.773 / % possible all: 97 |
-Phasing
Phasing | Method: ![]() |
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Processing
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Refinement | Method to determine structure: ![]() Starting model: 7B5T Resolution: 1→18.03 Å / SU ML: 0.13 / Cross valid method: FREE R-VALUE / σ(F): 1.36 / Phase error: 27.34 / 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: 81.75 Å2 / Biso mean: 20.4 Å2 / Biso min: 7.82 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: final / Resolution: 1→18.03 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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