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- EMDB-28659: Cryo-EM structure of S. aureus BlaR1 with C1 symmetry -

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Basic information

Entry
Database: EMDB / ID: EMD-28659
TitleCryo-EM structure of S. aureus BlaR1 with C1 symmetry
Map dataSharpened map from cryosparc local refinement.
Sample
  • Complex: Dimeric complex of S. aureus BlaR1
    • Protein or peptide: Beta-lactam sensor/signal transducer BlaR1
  • Ligand: ZINC ION
Function / homologyPeptidase M56 / BlaR1 peptidase M56 / Penicillin-binding protein, transpeptidase / Penicillin binding protein transpeptidase domain / penicillin binding / Beta-lactamase/transpeptidase-like / membrane / BlaR1
Function and homology information
Biological speciesStaphylococcus aureus (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.9 Å
AuthorsWorrall LJ / Alexander JAN / Vuckovic M / Strynadka NCJ
Funding support Canada, 1 items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR) Canada
CitationJournal: Nature / Year: 2023
Title: Structural basis of broad-spectrum β-lactam resistance in Staphylococcus aureus.
Authors: J Andrew N Alexander / Liam J Worrall / Jinhong Hu / Marija Vuckovic / Nidhi Satishkumar / Raymond Poon / Solmaz Sobhanifar / Federico I Rosell / Joshua Jenkins / Daniel Chiang / Wesley A ...Authors: J Andrew N Alexander / Liam J Worrall / Jinhong Hu / Marija Vuckovic / Nidhi Satishkumar / Raymond Poon / Solmaz Sobhanifar / Federico I Rosell / Joshua Jenkins / Daniel Chiang / Wesley A Mosimann / Henry F Chambers / Mark Paetzel / Som S Chatterjee / Natalie C J Strynadka /
Abstract: Broad-spectrum β-lactam antibiotic resistance in Staphylococcus aureus is a global healthcare burden. In clinical strains, resistance is largely controlled by BlaR1, a receptor that senses β- ...Broad-spectrum β-lactam antibiotic resistance in Staphylococcus aureus is a global healthcare burden. In clinical strains, resistance is largely controlled by BlaR1, a receptor that senses β-lactams through the acylation of its sensor domain, inducing transmembrane signalling and activation of the cytoplasmic-facing metalloprotease domain. The metalloprotease domain has a role in BlaI derepression, inducing blaZ (β-lactamase PC1) and mecA (β-lactam-resistant cell-wall transpeptidase PBP2a) expression. Here, overcoming hurdles in isolation, we show that BlaR1 cleaves BlaI directly, as necessary for inactivation, with no requirement for additional components as suggested previously. Cryo-electron microscopy structures of BlaR1-the wild type and an autocleavage-deficient F284A mutant, with or without β-lactam-reveal a domain-swapped dimer that we suggest is critical to the stabilization of the signalling loops within. BlaR1 undergoes spontaneous autocleavage in cis between Ser283 and Phe284 and we describe the catalytic mechanism and specificity underlying the self and BlaI cleavage. The structures suggest that allosteric signalling emanates from β-lactam-induced exclusion of the prominent extracellular loop bound competitively in the sensor-domain active site, driving subsequent dynamic motions, including a shift in the sensor towards the membrane and accompanying changes in the zinc metalloprotease domain. We propose that this enhances the expulsion of autocleaved products from the active site, shifting the equilibrium to a state that is permissive of efficient BlaI cleavage. Collectively, this study provides a structure of a two-component signalling receptor that mediates action-in this case, antibiotic resistance-through the direct cleavage of a repressor.
History
DepositionOct 25, 2022-
Header (metadata) releaseJan 11, 2023-
Map releaseJan 11, 2023-
UpdateJan 25, 2023-
Current statusJan 25, 2023Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_28659.png

Downloads & links

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Map

FileDownload / File: emd_28659.map.gz / Format: CCP4 / Size: 8 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationSharpened map from cryosparc local refinement.
Voxel sizeX=Y=Z: 1.8047 Å
Density
Contour LevelBy AUTHOR: 0.17
Minimum - Maximum-0.6067093 - 1.03513
Average (Standard dev.)0.002854044 (±0.04461814)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions128128128
Spacing128128128
CellA=B=C: 231.0016 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half map from cryosparc local refinement.

Fileemd_28659_half_map_1.map
AnnotationHalf map from cryosparc local refinement.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map from cryosparc local refinement.

Fileemd_28659_half_map_2.map
AnnotationHalf map from cryosparc local refinement.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Dimeric complex of S. aureus BlaR1

EntireName: Dimeric complex of S. aureus BlaR1
Components
  • Complex: Dimeric complex of S. aureus BlaR1
    • Protein or peptide: Beta-lactam sensor/signal transducer BlaR1
  • Ligand: ZINC ION

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Supramolecule #1: Dimeric complex of S. aureus BlaR1

SupramoleculeName: Dimeric complex of S. aureus BlaR1 / type: complex / ID: 1 / Chimera: Yes / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Staphylococcus aureus (bacteria)
Molecular weightTheoretical: 142 KDa

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Macromolecule #1: Beta-lactam sensor/signal transducer BlaR1

MacromoleculeName: Beta-lactam sensor/signal transducer BlaR1 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Staphylococcus aureus (bacteria)
Molecular weightTheoretical: 71.269703 KDa
Recombinant expressionOrganism: Lactobacillus delbrueckii subsp. lactis (bacteria)
SequenceString: MAKLLIMSIV SFCFIFLLLL FFRYILKRYF NYMLNYKVWY LTLLAGLIPF IPIKFSLFKF NNVNNQAPTV ESKSHDLNHN INTTKPIQE FATDIHKFNW DSIDNICTVI WIVLVIILSF KFLKALLYLK YLKKQSLYLN ENEKNKIDTI LFNHQYKKNI V IRKAETIQ ...String:
MAKLLIMSIV SFCFIFLLLL FFRYILKRYF NYMLNYKVWY LTLLAGLIPF IPIKFSLFKF NNVNNQAPTV ESKSHDLNHN INTTKPIQE FATDIHKFNW DSIDNICTVI WIVLVIILSF KFLKALLYLK YLKKQSLYLN ENEKNKIDTI LFNHQYKKNI V IRKAETIQ SPITFWYGKY IILIPSSYFK SVIDKRLKYI ILHEYAHAKN RDTLHLIIFN IFSIIMSYNP LVHIVKRKII HD NEVEADR FVLNNINKNE FKTYAESIMD SVLNVPFFNK NILSHSFNGK KSLLKRRLIN IKEANLKKQS KLILIFICIF TFL LMVIQS QFLMGQSITD YNYKKPLHND YQILDKSKIF GSNSGSFVMY SMKKDKYYIY NEKESRKRYS PNSTYKIYLA MFGL DRHII NDENSRMSWN HKHYPFDAWN KEQDLNTAMQ NSVNWYFERI SDQIPKNYTA TQLKQLNYGN KNLGSYKSYW MEDSL KISN LEQVIVFKNM MEQNNHFSKK AKNQLSSSLL IKKNEKYELY GKTGTGIVNG KYNNGWFVGY VITNHDKYYF ATHLSD GKP SGKNAELISE KILKEMGVLN GQELALVPRG SSAHHHHHH

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Macromolecule #2: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 2 / Number of copies: 2 / Formula: ZN
Molecular weightTheoretical: 65.409 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.5 mg/mL
BufferpH: 7.5 / Details: 20 mM HEPES, pH 7.5, 150 mM sodium chloride
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.5 µm
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 50.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 7508828
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 4.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 23797
FSC plot (resolution estimation)

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