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Open data
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Basic information
Entry | Database: PDB / ID: 7tfe | ||||||||||||
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Title | L. monocytogenes GS(12) - apo | ||||||||||||
![]() | Glutamine synthetase![]() | ||||||||||||
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Function / homology | ![]() polyamine catabolic process / ![]() ![]() ![]() ![]() ![]() Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() | ||||||||||||
Method | ![]() ![]() ![]() | ||||||||||||
![]() | Travis, B.A. / Peck, J. / Schumacher, M.A. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Molecular dissection of the glutamine synthetase-GlnR nitrogen regulatory circuitry in Gram-positive bacteria. Authors: Brady A Travis / Jared V Peck / Raul Salinas / Brandon Dopkins / Nicholas Lent / Viet D Nguyen / Mario J Borgnia / Richard G Brennan / Maria A Schumacher / ![]() Abstract: How bacteria sense and respond to nitrogen levels are central questions in microbial physiology. In Gram-positive bacteria, nitrogen homeostasis is controlled by an operon encoding glutamine ...How bacteria sense and respond to nitrogen levels are central questions in microbial physiology. In Gram-positive bacteria, nitrogen homeostasis is controlled by an operon encoding glutamine synthetase (GS), a dodecameric machine that assimilates ammonium into glutamine, and the GlnR repressor. GlnR detects nitrogen excess indirectly by binding glutamine-feedback-inhibited-GS (FBI-GS), which activates its transcription-repression function. The molecular mechanisms behind this regulatory circuitry, however, are unknown. Here we describe biochemical and structural analyses of GS and FBI-GS-GlnR complexes from pathogenic and non-pathogenic Gram-positive bacteria. The structures show FBI-GS binds the GlnR C-terminal domain within its active-site cavity, juxtaposing two GlnR monomers to form a DNA-binding-competent GlnR dimer. The FBI-GS-GlnR interaction stabilizes the inactive GS conformation. Strikingly, this interaction also favors a remarkable dodecamer to tetradecamer transition in some GS, breaking the paradigm that all bacterial GS are dodecamers. These data thus unveil unique structural mechanisms of transcription and enzymatic regulation. | ||||||||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 894.9 KB | Display | ![]() |
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PDB format | ![]() | 739.3 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 25871MC ![]() 7tdpC ![]() 7tdvC ![]() 7teaC ![]() 7tecC ![]() 7tenC ![]() 7tf6C ![]() 7tf7C ![]() 7tf9C ![]() 7tfaC ![]() 7tfbC ![]() 7tfcC ![]() 7tfdC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | ![]() Mass: 52763.766 Da / Num. of mol.: 12 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: glnA, BW273_06565, CW834_10155, E3W32_09805, E5H26_02065, FL871_07615, GF092_00575, GIG92_01785, GIH49_01255, HF764_002412 Production host: ![]() ![]() ![]() ![]() #2: Chemical | ChemComp-MG / Has ligand of interest | N | |
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-Experimental details
-Experiment
Experiment | Method: ![]() |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: ![]() |
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Sample preparation
Component | Name: Apo dodecameric L. monocytogenes GS complex / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() ![]() |
Buffer solution | pH: 7.5 |
Specimen | Conc.: 0.9 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied![]() ![]() |
Vitrification![]() | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |
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Microscopy | Model: FEI TALOS ARCTICA |
Electron gun | Electron source![]() ![]() |
Electron lens | Mode: BRIGHT FIELD![]() |
Image recording | Electron dose: 42.6 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
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EM software |
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CTF correction![]() | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry![]() ![]() | ||||||||||||||||||||||||||||||||||||||||
3D reconstruction![]() | Resolution: 2.85 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 260267 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||
Atomic model building | Space: REAL | ||||||||||||||||||||||||||||||||||||||||
Refinement | Cross valid method: NONE Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 108.63 Å2 | ||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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