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- EMDB-29718: Green Fluorescence Protein imaged on a cryo-EM imaging scaffold -

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Basic information

Entry
Database: EMDB / ID: EMD-29718
TitleGreen Fluorescence Protein imaged on a cryo-EM imaging scaffold
Map dataGreen Fluorescence Protein imaged on a cryo-EM imaging scaffold
Sample
  • Complex: sfGFP displayed on a Cryo-EM imaging scaffold
    • Protein or peptide: RCG-10 - Cryo-EM imaging scaffold subunit B fused to DARPin
    • Protein or peptide: Superfolder Green Fluorescent Protein
KeywordsCryoEM imaging scaffold / Cancer / GTPase / SIGNALING PROTEIN
Biological speciessynthetic construct (others) / Aequorea victoria (jellyfish)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.98 Å
AuthorsCastells-Graells R / Sawaya MR / Yeates TO
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM129854 United States
Department of Energy (DOE, United States)DE-FC02-02ER63421 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: Cryo-EM structure determination of small therapeutic protein targets at 3 Å-resolution using a rigid imaging scaffold.
Authors: Roger Castells-Graells / Kyle Meador / Mark A Arbing / Michael R Sawaya / Morgan Gee / Duilio Cascio / Emma Gleave / Judit É Debreczeni / Jason Breed / Karoline Leopold / Ankoor Patel / ...Authors: Roger Castells-Graells / Kyle Meador / Mark A Arbing / Michael R Sawaya / Morgan Gee / Duilio Cascio / Emma Gleave / Judit É Debreczeni / Jason Breed / Karoline Leopold / Ankoor Patel / Dushyant Jahagirdar / Bronwyn Lyons / Sriram Subramaniam / Chris Phillips / Todd O Yeates /
Abstract: Cryoelectron microscopy (Cryo-EM) has enabled structural determination of proteins larger than about 50 kDa, including many intractable by any other method, but it has largely failed for smaller ...Cryoelectron microscopy (Cryo-EM) has enabled structural determination of proteins larger than about 50 kDa, including many intractable by any other method, but it has largely failed for smaller proteins. Here, we obtain structures of small proteins by binding them to a rigid molecular scaffold based on a designed protein cage, revealing atomic details at resolutions reaching 2.9 Å. We apply this system to the key cancer signaling protein KRAS (19 kDa in size), obtaining four structures of oncogenic mutational variants by cryo-EM. Importantly, a structure for the key G12C mutant bound to an inhibitor drug (AMG510) reveals significant conformational differences compared to prior data in the crystalline state. The findings highlight the promise of cryo-EM scaffolds for advancing the design of drug molecules against small therapeutic protein targets in cancer and other human diseases.
History
DepositionFeb 9, 2023-
Header (metadata) releaseAug 9, 2023-
Map releaseAug 9, 2023-
UpdateNov 6, 2024-
Current statusNov 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_29718.png

Downloads & links

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Map

FileDownload / File: emd_29718.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationGreen Fluorescence Protein imaged on a cryo-EM imaging scaffold
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.24 Å/pix.
x 256 pix.
= 316.8 Å		1.24 Å/pix.
x 256 pix.
= 316.8 Å		1.24 Å/pix.
x 256 pix.
= 316.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.2375 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.7
Minimum - Maximum-4.8770094 - 7.0146117
Average (Standard dev.)0.013487803 (±0.08067675)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 316.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half Map 1

Fileemd_29718_half_map_1.map
AnnotationHalf Map 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half Map 2

Fileemd_29718_half_map_2.map
AnnotationHalf Map 2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : sfGFP displayed on a Cryo-EM imaging scaffold

EntireName: sfGFP displayed on a Cryo-EM imaging scaffold
Components
  • Complex: sfGFP displayed on a Cryo-EM imaging scaffold
    • Protein or peptide: RCG-10 - Cryo-EM imaging scaffold subunit B fused to DARPin
    • Protein or peptide: Superfolder Green Fluorescent Protein

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Supramolecule #1: sfGFP displayed on a Cryo-EM imaging scaffold

SupramoleculeName: sfGFP displayed on a Cryo-EM imaging scaffold / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: synthetic construct (others)

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Macromolecule #1: RCG-10 - Cryo-EM imaging scaffold subunit B fused to DARPin

MacromoleculeName: RCG-10 - Cryo-EM imaging scaffold subunit B fused to DARPin
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 35.287246 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MFTRRGDQGE TDLANRARVG KDSPVVEVQG TIDELNSFIG YALVLSRWDD IRNDLFRIQN DLFVLGEDVS TGGKGRTVTM DMIIYLIKR SVEMKAEIGK IELFVVPGGS VESASLHMAR AVSRRLERRI KAASELTEIN ANVLLYANML SNILFMHALI S NKRKEELD ...String:
MFTRRGDQGE TDLANRARVG KDSPVVEVQG TIDELNSFIG YALVLSRWDD IRNDLFRIQN DLFVLGEDVS TGGKGRTVTM DMIIYLIKR SVEMKAEIGK IELFVVPGGS VESASLHMAR AVSRRLERRI KAASELTEIN ANVLLYANML SNILFMHALI S NKRKEELD KKLLEAARAG YDDQVAALLA KGADVNAADD VGVTPLHLAA QRGHLEIVEV LLKRGADINA ADLWGQTPLH LA ATAGHLE IVELLLRWGA DVNARDNIGH TPLHLAAWAG HLEIVEVLLK YGADVNAQDK FGKTPFDLAI DNGNEDIAEV LQK AA

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Macromolecule #2: Superfolder Green Fluorescent Protein

MacromoleculeName: Superfolder Green Fluorescent Protein / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Aequorea victoria (jellyfish)
Molecular weightTheoretical: 26.623918 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSKGEELFTG VVPILVELDG DVNGHKFSVR GEGEGDATNG KLTLKFICTT GKLPVPWPTL VTTL(CRO)VQCFS RYPDHM KRH DFFKSAMPEG YVQERTISFK DDGTYKTRAE VKFEGDTLVN RIELKGIDFK EDGNILGHKL EYNFNSHNVY ITADKQK NG IKANFKIRHN ...String:
MSKGEELFTG VVPILVELDG DVNGHKFSVR GEGEGDATNG KLTLKFICTT GKLPVPWPTL VTTL(CRO)VQCFS RYPDHM KRH DFFKSAMPEG YVQERTISFK DDGTYKTRAE VKFEGDTLVN RIELKGIDFK EDGNILGHKL EYNFNSHNVY ITADKQK NG IKANFKIRHN VEDGSVQLAD HYQQNTPIGD GPVLLPDNHY LSTQSALSKD PNEKRDHMVL LEFVTAAGIT HHHHHH

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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

BufferpH: 8
GridModel: Quantifoil R2/2 / Material: COPPER / Mesh: 300
VitrificationCryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 33.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.2 µm / Nominal defocus min: 1.0 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 2.98 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 1221977
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL
Output model

PDB-8g4e:
Green Fluorescence Protein imaged on a cryo-EM imaging scaffold

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