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- EMDB-71565: QFX11 peptide nanofibril -

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Basic information

Entry
Database: EMDB / ID: EMD-71565
TitleQFX11 peptide nanofibril
Map data
Sample
  • Complex: Helical oligomer of QFX11 peptides
    • Protein or peptide: QFX11 peptide
KeywordsShort peptide / Cross beta / Nanofibril / PROTEIN FIBRIL
Biological speciessynthetic construct (others)
Methodhelical reconstruction / cryo EM / Resolution: 4.1 Å
AuthorsSonani RR / Schremmer ZP / Nilsson BL / Egelman EH
Funding support United States, 2 items
OrganizationGrant numberCountry
National Science Foundation (NSF, United States)NSF 2304854 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM122510 United States
CitationJournal: To Be Published
Title: QFX11 peptide nanofibril
Authors: Sonani RR / Egelman EH
History
DepositionJul 2, 2025-
Header (metadata) releaseJul 22, 2026-
Map releaseJul 22, 2026-
UpdateJul 22, 2026-
Current statusJul 22, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_71565.png

Downloads & links

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Map

FileReleased
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 256 pix.
= 272.64 Å		1.07 Å/pix.
x 256 pix.
= 272.64 Å		1.07 Å/pix.
x 256 pix.
= 272.64 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.065 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.99
Minimum - Maximum-0.08639822 - 11.081492000000001
Average (Standard dev.)-0.024968984 (±0.32300487)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 272.64 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_71565_additional_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_71565_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_71565_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Helical oligomer of QFX11 peptides

EntireName: Helical oligomer of QFX11 peptides
Components
  • Complex: Helical oligomer of QFX11 peptides
    • Protein or peptide: QFX11 peptide

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Supramolecule #1: Helical oligomer of QFX11 peptides

SupramoleculeName: Helical oligomer of QFX11 peptides / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: synthetic construct (others)

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Macromolecule #1: QFX11 peptide

MacromoleculeName: QFX11 peptide / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 1.53173 KDa
SequenceString:
(ACE)QEFKFQFEF KQ(NH2)

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Experimental details

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Structure determination

Methodcryo EM
Processinghelical reconstruction
Aggregation statehelical array

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Sample preparation

BufferpH: 7
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.4 µm / Nominal defocus min: 1.2 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionApplied symmetry - Helical parameters - Δz: 4.7 Å
Applied symmetry - Helical parameters - Δ&Phi: -4.5 °
Applied symmetry - Helical parameters - Axial symmetry: C2 (2 fold cyclic)
Resolution.type: BY AUTHOR / Resolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 14184
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final angle assignmentType: NOT APPLICABLE

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