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- PDB-7lq6: CryoEM structure of Escherichia coli PBP1b -

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Basic information

Entry
Database: PDB / ID: 7lq6
TitleCryoEM structure of Escherichia coli PBP1b
ComponentsPenicillin-binding protein 1B
KeywordsTRANSFERASE / HYDROLASE / Penicillin binding protein / glycosyltransferase / transpeptidase
Function / homology
Function and homology information


positive regulation of bipolar cell growth / cell wall repair / peptidoglycan glycosyltransferase / peptidoglycan glycosyltransferase activity / serine-type D-Ala-D-Ala carboxypeptidase / serine-type D-Ala-D-Ala carboxypeptidase activity / penicillin binding / peptidoglycan biosynthetic process / peptidoglycan-based cell wall / regulation of cell shape ...positive regulation of bipolar cell growth / cell wall repair / peptidoglycan glycosyltransferase / peptidoglycan glycosyltransferase activity / serine-type D-Ala-D-Ala carboxypeptidase / serine-type D-Ala-D-Ala carboxypeptidase activity / penicillin binding / peptidoglycan biosynthetic process / peptidoglycan-based cell wall / regulation of cell shape / outer membrane-bounded periplasmic space / response to antibiotic / proteolysis / membrane / plasma membrane
Similarity search - Function
Penicillin-binding protein 1B / Bifunctional transglycosylase second domain / Transglycosylase PBP1b, N-terminal transmembrane domain / Transmembrane domain of transglycosylase PBP1 at N-terminal / Bifunctional transglycosylase second domain / Glycosyl transferase, family 51 / Penicillin binding protein transglycosylase domain / : / Transglycosylase / Penicillin-binding protein, transpeptidase ...Penicillin-binding protein 1B / Bifunctional transglycosylase second domain / Transglycosylase PBP1b, N-terminal transmembrane domain / Transmembrane domain of transglycosylase PBP1 at N-terminal / Bifunctional transglycosylase second domain / Glycosyl transferase, family 51 / Penicillin binding protein transglycosylase domain / : / Transglycosylase / Penicillin-binding protein, transpeptidase / Penicillin binding protein transpeptidase domain / Beta-lactamase/transpeptidase-like / Lysozyme-like domain superfamily
Similarity search - Domain/homology
Penicillin-binding protein 1B
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.28 Å
AuthorsCaveney, N.A. / Workman, S.D. / Yan, R. / Atkinson, C.E. / Yu, Z. / Strynadka, N.C.J.
Funding support Canada, 1items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR) Canada
CitationJournal: Nat Commun / Year: 2021
Title: CryoEM structure of the antibacterial target PBP1b at 3.3 Å resolution.
Authors: Nathanael A Caveney / Sean D Workman / Rui Yan / Claire E Atkinson / Zhiheng Yu / Natalie C J Strynadka /
Abstract: The pathway for the biosynthesis of the bacterial cell wall is one of the most prolific antibiotic targets, exemplified by the widespread use of β-lactam antibiotics. Despite this, our structural ...The pathway for the biosynthesis of the bacterial cell wall is one of the most prolific antibiotic targets, exemplified by the widespread use of β-lactam antibiotics. Despite this, our structural understanding of class A penicillin binding proteins, which perform the last two steps in this pathway, is incomplete due to the inherent difficulty in their crystallization and the complexity of their substrates. Here, we determine the near atomic resolution structure of the 83 kDa class A PBP from Escherichia coli, PBP1b, using cryogenic electron microscopy and a styrene maleic acid anhydride membrane mimetic. PBP1b, in its apo form, is seen to exhibit a distinct conformation in comparison to Moenomycin-bound crystal structures. The work herein paves the way for the use of cryoEM in structure-guided antibiotic development for this notoriously difficult to crystalize class of proteins and their complex substrates.
History
DepositionFeb 13, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 26, 2021Provider: repository / Type: Initial release
Revision 1.1Mar 6, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: Penicillin-binding protein 1B


Theoretical massNumber of molelcules
Total (without water)83,2801
Polymers83,2801
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area0 Å2
ΔGint0 kcal/mol
Surface area30110 Å2

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Components

#1: Protein Penicillin-binding protein 1B / PBP-1b / PBP1b / Murein polymerase


Mass: 83280.352 Da / Num. of mol.: 1 / Fragment: UNP residues 58-804
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (strain K12) (bacteria)
Strain: K12 / Gene: mrcB, pbpF, ponB, b0149, JW0145 / Production host: Escherichia coli (E. coli)
References: UniProt: P02919, peptidoglycan glycosyltransferase, serine-type D-Ala-D-Ala carboxypeptidase

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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: Escherichia coli PBP1b in SMA / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.083 MDa / Experimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
SpecimenConc.: 0.125 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K / Details: 3 blot force, 3 second blot

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: OTHER / Calibrated magnification: 105000 X / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameCategory
13RELION3D reconstruction
14cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.28 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 462997 / Symmetry type: POINT

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