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- PDB-8qv8: Cryo-EM structure of the heat-irreversible amyloid fibrils of hen... -

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Basic information

Entry
Database: PDB / ID: 8qv8
TitleCryo-EM structure of the heat-irreversible amyloid fibrils of hen egg-white lysozyme
Components
  • (Unidentified peptide) x 2
  • Lysozyme C
KeywordsPROTEIN FIBRIL / amyloid / irreversible
Function / homology
Function and homology information


Lactose synthesis / Antimicrobial peptides / Neutrophil degranulation / beta-N-acetylglucosaminidase activity / cell wall macromolecule catabolic process / lysozyme / lysozyme activity / defense response to Gram-negative bacterium / killing of cells of another organism / defense response to Gram-positive bacterium ...Lactose synthesis / Antimicrobial peptides / Neutrophil degranulation / beta-N-acetylglucosaminidase activity / cell wall macromolecule catabolic process / lysozyme / lysozyme activity / defense response to Gram-negative bacterium / killing of cells of another organism / defense response to Gram-positive bacterium / defense response to bacterium / endoplasmic reticulum / extracellular space / identical protein binding / cytoplasm
Similarity search - Function
Glycoside hydrolase, family 22, lysozyme / Glycoside hydrolase family 22 domain / Glycosyl hydrolases family 22 (GH22) domain signature. / Glycoside hydrolase, family 22 / C-type lysozyme/alpha-lactalbumin family / Glycosyl hydrolases family 22 (GH22) domain profile. / Alpha-lactalbumin / lysozyme C / Lysozyme-like domain superfamily
Similarity search - Domain/homology
Biological speciesGallus gallus (chicken)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.26 Å
AuthorsFrey, L. / Greenwald, J. / Riek, R.
Funding support Switzerland, 1items
OrganizationGrant numberCountry
Swiss National Science Foundation Switzerland
CitationJournal: Nat Commun / Year: 2024
Title: A structural rationale for reversible vs irreversible amyloid fibril formation from a single protein.
Authors: Lukas Frey / Jiangtao Zhou / Gea Cereghetti / Marco E Weber / David Rhyner / Aditya Pokharna / Luca Wenchel / Harindranath Kadavath / Yiping Cao / Beat H Meier / Matthias Peter / Jason ...Authors: Lukas Frey / Jiangtao Zhou / Gea Cereghetti / Marco E Weber / David Rhyner / Aditya Pokharna / Luca Wenchel / Harindranath Kadavath / Yiping Cao / Beat H Meier / Matthias Peter / Jason Greenwald / Roland Riek / Raffaele Mezzenga /
Abstract: Reversible and irreversible amyloids are two diverging cases of protein (mis)folding associated with the cross-β motif in the protein folding and aggregation energy landscape. Yet, the molecular ...Reversible and irreversible amyloids are two diverging cases of protein (mis)folding associated with the cross-β motif in the protein folding and aggregation energy landscape. Yet, the molecular origins responsible for the formation of reversible vs irreversible amyloids have remained unknown. Here we provide evidence at the atomic level of distinct folding motifs for irreversible and reversible amyloids derived from a single protein sequence: human lysozyme. We compare the 2.8 Å structure of irreversible amyloid fibrils determined by cryo-electron microscopy helical reconstructions with molecular insights gained by solid-state NMR spectroscopy on reversible amyloids. We observe a canonical cross-β-sheet structure in irreversible amyloids, whereas in reversible amyloids, there is a less-ordered coexistence of β-sheet and helical secondary structures that originate from a partially unfolded lysozyme, thus carrying a "memory" of the original folded protein precursor. We also report the structure of hen egg-white lysozyme irreversible amyloids at 3.2 Å resolution, revealing another canonical amyloid fold, and reaffirming that irreversible amyloids undergo a complete conversion of the native protein into the cross-β structure. By combining atomic force microscopy, cryo-electron microscopy and solid-state NMR, we show that a full unfolding of the native protein precursor is a requirement for establishing irreversible amyloid fibrils.
History
DepositionOct 17, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Sep 18, 2024Provider: repository / Type: Initial release
Revision 1.1Oct 16, 2024Group: Data collection / Database references / Structure summary
Category: citation / citation_author ...citation / citation_author / em_admin / pdbx_entry_details
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Lysozyme C
B: Unidentified peptide
C: Lysozyme C
D: Unidentified peptide
E: Lysozyme C
F: Unidentified peptide
G: Lysozyme C
H: Unidentified peptide
I: Lysozyme C
J: Unidentified peptide
K: Unidentified peptide
L: Unidentified peptide
M: Unidentified peptide
N: Unidentified peptide
O: Unidentified peptide


Theoretical massNumber of molelcules
Total (without water)79,07015
Polymers79,07015
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area31090 Å2
ΔGint-119 kcal/mol
Surface area17810 Å2
MethodPISA

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Components

#1: Protein
Lysozyme C / 1 / 4-beta-N-acetylmuramidase C / Allergen Gal d IV


Mass: 14331.160 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Gallus gallus (chicken) / Gene: LYZ / Production host: Gallus gallus (chicken) / References: UniProt: P00698, lysozyme
#2: Protein/peptide
Unidentified peptide


Mass: 783.958 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Gallus gallus (chicken) / Production host: Gallus gallus (chicken)
#3: Protein/peptide
Unidentified peptide


Mass: 698.854 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Gallus gallus (chicken) / Production host: Gallus gallus (chicken)
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: FILAMENT / 3D reconstruction method: helical reconstruction

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Sample preparation

ComponentName: lysozyme amyloid fibril / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Gallus gallus (chicken)
Source (recombinant)Organism: Gallus gallus (chicken)
Buffer solutionpH: 7 / Details: 20mM DTT
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE-PROPANE

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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 magnification: 130000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 1 sec. / Electron dose: 63.6 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of real images: 822
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategory
2EPUimage acquisition
12RELION4.0.0classification
13RELION4.0.03D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: -1.22 ° / Axial rise/subunit: 4.78 Å / Axial symmetry: C1
3D reconstructionResolution: 3.26 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 110561 / Symmetry type: HELICAL
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL

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