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- PDB-8v24: LapB cytoplasmic domain in complex with LpxC -

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Basic information

Entry
Database: PDB / ID: 8v24
TitleLapB cytoplasmic domain in complex with LpxC
Components
  • Lipopolysaccharide assembly protein B
  • UDP-3-O-acyl-N-acetylglucosamine deacetylase
KeywordsPROTEIN BINDING / adaptor / complex / deacetylase / LPS / LpxC / LapB(YciM)
Function / homology
Function and homology information


lipopolysaccharide metabolic process / UDP-3-O-acyl-N-acetylglucosamine deacetylase / UDP-3-O-[3-hydroxymyristoyl] N-acetylglucosamine deacetylase activity / UDP-3-O-acyl-N-acetylglucosamine deacetylase activity / regulation of lipid biosynthetic process / lipid A biosynthetic process / cytoplasmic side of plasma membrane / iron ion binding / metal ion binding
Similarity search - Function
Lipopolysaccharide assembly protein B / LapB, rubredoxin metal binding domain / Rubredoxin metal binding domain / Tetratricopeptide repeat / UDP-3-O-acyl N-acetylglucosamine deacetylase / UDP-3-O-acyl N-acetylglucosamine deacetylase, C-terminal / UDP-3-O-acyl N-acetylglucosamine deacetylase, N-terminal / UDP-3-O-acyl N-acetylglycosamine deacetylase / Tetratricopeptide repeat / TPR repeat region circular profile. ...Lipopolysaccharide assembly protein B / LapB, rubredoxin metal binding domain / Rubredoxin metal binding domain / Tetratricopeptide repeat / UDP-3-O-acyl N-acetylglucosamine deacetylase / UDP-3-O-acyl N-acetylglucosamine deacetylase, C-terminal / UDP-3-O-acyl N-acetylglucosamine deacetylase, N-terminal / UDP-3-O-acyl N-acetylglycosamine deacetylase / Tetratricopeptide repeat / TPR repeat region circular profile. / TPR repeat profile. / Tetratricopeptide repeats / Tetratricopeptide repeat / Tetratricopeptide-like helical domain superfamily / Ribosomal protein S5 domain 2-type fold
Similarity search - Domain/homology
Chem-24G / ACETATE ION / UDP-3-O-acyl-N-acetylglucosamine deacetylase / Lipopolysaccharide assembly protein B
Similarity search - Component
Biological speciesEscherichia coli CFT073 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsMi, W. / Shu, S.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM137068 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)RM1GM149406 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2024
Title: Dual function of LapB (YciM) in regulating lipopolysaccharide synthesis.
Authors: Sheng Shu / Yuko Tsutsui / Rajkanwar Nathawat / Wei Mi /
Abstract: Levels of lipopolysaccharide (LPS), an essential glycolipid on the surface of most gram-negative bacteria, are tightly controlled-making LPS synthesis a promising target for developing new ...Levels of lipopolysaccharide (LPS), an essential glycolipid on the surface of most gram-negative bacteria, are tightly controlled-making LPS synthesis a promising target for developing new antibiotics. adaptor protein LapB (YciM) plays an important role in regulating LPS synthesis by promoting degradation of LpxC, a deacetylase that catalyzes the first committed step in LPS synthesis. Under conditions where LPS is abundant, LapB recruits LpxC to the AAA+ protease FtsH for degradation. LapB achieves this by simultaneously interacting with FtsH through its transmembrane helix and LpxC through its cytoplasmic domain. Here, we describe a cryo-EM structure of the complex formed between LpxC and the cytoplasmic domain of LapB (LapB). The structure reveals how LapB exploits both its tetratricopeptide repeat (TPR) motifs and rubredoxin domain to interact with LpxC. Through both in vitro and in vivo analysis, we show that mutations at the LapB/LpxC interface prevent LpxC degradation. Unexpectedly, binding to LapB also inhibits the enzymatic activity of LpxC through allosteric effects reminiscent of LpxC activation by MurA in Our findings argue that LapB regulates LPS synthesis in two steps: In the first step, LapB inhibits the activity of LpxC, and in the second step, it commits LpxC to degradation by FtsH.
History
DepositionNov 21, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 24, 2024Provider: repository / Type: Initial release
Revision 1.1May 1, 2024Group: Database references / Category: citation / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2May 8, 2024Group: Database references / Category: citation / citation_author
Item: _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Lipopolysaccharide assembly protein B
B: UDP-3-O-acyl-N-acetylglucosamine deacetylase
C: Lipopolysaccharide assembly protein B
D: UDP-3-O-acyl-N-acetylglucosamine deacetylase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)159,13312
Polymers157,1704
Non-polymers1,9638
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Lipopolysaccharide assembly protein B


Mass: 44588.969 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli CFT073 (bacteria) / Strain: CFT073 / ATCC 700928 / UPEC / Gene: lapB / Production host: Escherichia coli K-12 (bacteria) / References: UniProt: P0AB59
#2: Protein UDP-3-O-acyl-N-acetylglucosamine deacetylase /


Mass: 33995.871 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli CFT073 (bacteria) / Strain: CFT073 / ATCC 700928 / UPEC / Gene: lpxC / Production host: Escherichia coli K-12 (bacteria) / References: UniProt: P0A726
#3: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical ChemComp-24G / uridine-5'-diphosphate-3-O-(R-3-hydroxymyristoyl)-glucosamine / (2R,3R,4R,5S,6R)-3-amino-2-{[(R)-{[(S)-{[(2R,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methoxy}(hydroxy)phosphoryl]oxy}(hydroxy)phosphoryl]oxy}-5-hydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-4-yl (3R)-3-hydroxytetradecanoate


Mass: 791.672 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C29H51N3O18P2 / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-ACT / ACETATE ION / Acetate


Mass: 59.044 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C2H3O2 / Feature type: SUBJECT OF INVESTIGATION
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: LapB/LpxC / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Escherichia coli CFT073 (bacteria)
Source (recombinant)Organism: Escherichia coli K-12 (bacteria)
Buffer solutionpH: 7.8
SpecimenConc.: 10 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: C-flat-1.2/1.3
VitrificationInstrument: GATAN CRYOPLUNGE 3 / Cryogen name: ETHANE

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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 FIELDBright-field microscopy / Nominal magnification: 81000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm
Image recordingAverage exposure time: 2.6 sec. / Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1
EM imaging opticsEnergyfilter name: GIF Quantum LS / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategoryDetails
1cryoSPARC4.01particle selectiontemplate matching
2PHENIX1.20.1_4487:model refinement
5cryoSPARC4.01CTF correction
10cryoSPARC4.01initial Euler assignment
11cryoSPARC4.01final Euler assignment
12cryoSPARC4.01classification
13cryoSPARC4.013D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1171191 / Num. of class averages: 1 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00310223
ELECTRON MICROSCOPYf_angle_d0.49113797
ELECTRON MICROSCOPYf_dihedral_angle_d6.3471404
ELECTRON MICROSCOPYf_chiral_restr0.0621532
ELECTRON MICROSCOPYf_plane_restr0.0031786

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