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- PDB-8pb9: Cryo-EM structure of the c-di-GMP-bound FleQ-FleN master regulato... -

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Basic information

Entry
Database: PDB / ID: 8pb9
TitleCryo-EM structure of the c-di-GMP-bound FleQ-FleN master regulator complex from Pseudomonas aeruginosa
Components
  • Antiactivator FleN
  • Transcriptional regulator FleQ
KeywordsGENE REGULATION / Biofilm formation / c-di-GMP signaling / second messengers / bacterial secretion / bEBPs
Function / homology
Function and homology information


positive regulation of cilium-dependent cell motility / regulation of bacterial-type flagellum-dependent cell motility / negative regulation of cell division / cyclic-di-GMP binding / negative regulation of extracellular matrix assembly / positive regulation of cell-substrate adhesion / DNA-binding transcription repressor activity / DNA-binding transcription activator activity / cis-regulatory region sequence-specific DNA binding / protein-DNA complex ...positive regulation of cilium-dependent cell motility / regulation of bacterial-type flagellum-dependent cell motility / negative regulation of cell division / cyclic-di-GMP binding / negative regulation of extracellular matrix assembly / positive regulation of cell-substrate adhesion / DNA-binding transcription repressor activity / DNA-binding transcription activator activity / cis-regulatory region sequence-specific DNA binding / protein-DNA complex / cytoplasmic side of plasma membrane / transcription cis-regulatory region binding / DNA-templated transcription / regulation of DNA-templated transcription / ATP hydrolysis activity / ATP binding / cytosol
Similarity search - Function
Flagellum site-determining protein FlhG / Flagellar regulatory FleQ / Flagellar regulatory protein FleQ / Flagellum site-determining protein YlxH/ Fe-S cluster assembling factor NBP35 / NUBPL iron-transfer P-loop NTPase / ATP binding protein MinD/FleN / Sigma-54 interaction domain ATP-binding region A signature. / Sigma-54 interaction domain, conserved site / Sigma-54 interaction domain C-terminal part signature. / Sigma-54 interaction domain, ATP-binding site 2 ...Flagellum site-determining protein FlhG / Flagellar regulatory FleQ / Flagellar regulatory protein FleQ / Flagellum site-determining protein YlxH/ Fe-S cluster assembling factor NBP35 / NUBPL iron-transfer P-loop NTPase / ATP binding protein MinD/FleN / Sigma-54 interaction domain ATP-binding region A signature. / Sigma-54 interaction domain, conserved site / Sigma-54 interaction domain C-terminal part signature. / Sigma-54 interaction domain, ATP-binding site 2 / Sigma-54 interaction domain ATP-binding region B signature. / Sigma-54 interaction domain, ATP-binding site 1 / Sigma-54 interaction domain profile. / Sigma-54 interaction domain / RNA polymerase sigma factor 54 interaction domain / DNA binding HTH domain, Fis-type / Bacterial regulatory protein, Fis family / CheY-like superfamily / Homeobox-like domain superfamily / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER / Chem-C2E / Transcriptional regulator FleQ / Antiactivator FleN
Similarity search - Component
Biological speciesPseudomonas aeruginosa PAO1 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsTorres-Sanchez, L.T. / Krasteva, P.V.
Funding supportEuropean Union, 1items
OrganizationGrant numberCountry
European Research Council (ERC)BioMatrix 757507European Union
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: Structures of the FleQ-FleN master regulators reveal large-scale conformational switching in motility and biofilm control.
Authors: Lucía Torres-Sánchez / Thibault Géry Sana / Marion Decossas / Yaser Hashem / Petya Violinova Krasteva /
Abstract: can cause a wide array of chronic and acute infections associated with its ability to rapidly switch between planktonic, biofilm, and dispersed lifestyles, each with a specific arsenal for bacterial ... can cause a wide array of chronic and acute infections associated with its ability to rapidly switch between planktonic, biofilm, and dispersed lifestyles, each with a specific arsenal for bacterial survival and virulence. At the cellular level, many of the physiological transitions are orchestrated by the intracellular second messenger c-di-GMP and its receptor-effector FleQ. A bacterial enhancer binding protein, FleQ acts as a master regulator of both flagellar motility and adherence factor secretion and uses remarkably different transcription activation mechanisms depending on its dinucleotide loading state, adenosine triphosphatase (ATPase) activity, interactions with polymerase sigma (σ) factors, and complexation with a second ATPase, FleN. How the FleQ-FleN tandem can exert diverse effects through recognition of a conserved FleQ binding consensus has remained enigmatic. Here, we provide cryogenic electron microscopy (cryo-EM) structures of both c-di-GMP-bound and c-di-GMP-free FleQ-FleN complexes which deepen our understanding of the proteins' (di)nucleotide-dependent conformational switching and fine-tuned roles in gene expression regulation.
History
DepositionJun 8, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Dec 13, 2023Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
D: Transcriptional regulator FleQ
A: Antiactivator FleN
B: Antiactivator FleN
C: Transcriptional regulator FleQ
E: Transcriptional regulator FleQ
hetero molecules


Theoretical massNumber of molelcules
Total (without water)197,6989
Polymers195,3075
Non-polymers2,3914
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Transcriptional regulator FleQ


Mass: 44884.316 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Details: FleQ-receiver and AAA+ domains of Pseudomonas aeruginosa FleQ
Source: (gene. exp.) Pseudomonas aeruginosa PAO1 (bacteria) / Gene: fleQ, PA1097 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: G3XCV0
#2: Protein Antiactivator FleN


Mass: 30327.141 Da / Num. of mol.: 2 / Mutation: D48A
Source method: isolated from a genetically manipulated source
Details: Pseudomonas aeruginosa FleN D48A mutant / Source: (gene. exp.) Pseudomonas aeruginosa PAO1 (bacteria) / Gene: fleN, PA1454 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: G3XD64
#3: Chemical ChemComp-C2E / 9,9'-[(2R,3R,3aS,5S,7aR,9R,10R,10aS,12S,14aR)-3,5,10,12-tetrahydroxy-5,12-dioxidooctahydro-2H,7H-difuro[3,2-d:3',2'-j][1,3,7,9,2,8]tetraoxadiphosphacyclododecine-2,9-diyl]bis(2-amino-1,9-dihydro-6H-purin-6-one) / c-di-GMP / Cyclic diguanosine monophosphate


Mass: 690.411 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C20H24N10O14P2 / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical ChemComp-ACP / PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER / ADENOSINE-5'-[BETA, GAMMA-METHYLENE]TRIPHOSPHATE


Mass: 505.208 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C11H18N5O12P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: AMP-PCP, energy-carrying molecule analogue*YM
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: C-di-GMP bound FleQ-FleN complex from Pseudomonas aeruginosa
Type: COMPLEX
Details: C-di-GMP bound complex between FleQ REC and AAA+ domains and FleN D48A mutant from Pseudomonas aeruginosa
Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.233 MDa / Experimental value: NO
Source (natural)Organism: Pseudomonas aeruginosa PAO1 (bacteria)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 8
Details: 20 mM HEPES pH 8.0, 250mM NaCl, 2mM MgCl2, and 2% glycerol, 4 uM c-di-GMP, 200 uM ACP
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: FleN-D48A and FleQ (REC-AAA+) coexpression from the pProEx-Htb and pRSFDuet1 vectors. Purified via the HRV3c- cleavable N-terminal hexahistidine tag on FleN
Specimen supportGrid material: GOLD / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K / Details: triple deposition

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm
Image recordingElectron dose: 50.3 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 14640
Image scansWidth: 5760 / Height: 4092

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Processing

EM software
IDNameCategoryFitting-ID
4GctfCTF correction
7PHENIXmodel fitting1
8UCSF ChimeraXmodel fitting1
12cryoSPARCclassification
13cryoSPARC3D reconstruction
14PHENIXmodel refinement1
CTF correctionDetails: Gctf through cryoSPARC interface / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.3 Å / Resolution method: OTHER / Num. of particles: 1283732
Details: Due to flexibility, preferential orientation and partial occupancy for one of the subunits, the data was downsampled and the resolution used for refinement was cut to 3.3 angstrom after Deep EMhancer sharpening.
Num. of class averages: 1 / Symmetry type: POINT
Atomic model building
IDSpaceDetails
1REALCrystal structures fitting Refined in Phenix, coot and Namdinator
2
3
Atomic model building
ID 3D fitting-IDAccession codeDetailsInitial refinement model-IDSource nameType
115EXP, 5EXX, 4WXM, 7EJWthe model was interpreted by modular fitting of partial crystal structures and refined against the electron density1Otherexperimental model
22
33
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.01112502
ELECTRON MICROSCOPYf_angle_d0.82416947
ELECTRON MICROSCOPYf_dihedral_angle_d6.6411832
ELECTRON MICROSCOPYf_chiral_restr0.0431943
ELECTRON MICROSCOPYf_plane_restr0.0052193

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