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- EMDB-20959: Cryo-EM structure of the mechanosensitive channel MscS reconstitu... -

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Basic information

Entry
Database: EMDB / ID: EMD-20959
TitleCryo-EM structure of the mechanosensitive channel MscS reconstituted into peptidiscs
Map datamechanosensitive channel MscS reconstituted into peptidiscs
Sample
  • Complex: Small-conductance mechanosensitive channel MscS
    • Protein or peptide: Small-conductance mechanosensitive channel
Keywordsmembrane protein / mechanosensitive channels / MscS / membrane mimetic / peptidisc / TRANSPORT PROTEIN
Function / homology
Function and homology information


intracellular water homeostasis / mechanosensitive monoatomic ion channel activity / membrane => GO:0016020 / protein homooligomerization / transmembrane transport / monoatomic ion transmembrane transport / identical protein binding / membrane / plasma membrane
Similarity search - Function
Mechanosensitive ion channel MscS, archaea/bacteria type / Conserved TM helix / Mechanosensitive ion channel, conserved TM helix / : / : / Mechanosensitive ion channel MscS, C-terminal / Mechanosensitive ion channel, transmembrane helices 2/3 / Mechanosensitive ion channel MscS, conserved site / Uncharacterized protein family UPF0003 signature. / Mechanosensitive ion channel MscS, C-terminal ...Mechanosensitive ion channel MscS, archaea/bacteria type / Conserved TM helix / Mechanosensitive ion channel, conserved TM helix / : / : / Mechanosensitive ion channel MscS, C-terminal / Mechanosensitive ion channel, transmembrane helices 2/3 / Mechanosensitive ion channel MscS, conserved site / Uncharacterized protein family UPF0003 signature. / Mechanosensitive ion channel MscS, C-terminal / Mechanosensitive ion channel MscS, transmembrane-2 / Mechanosensitive ion channel MscS / Mechanosensitive ion channel, beta-domain / Mechanosensitive ion channel MscS, beta-domain superfamily / LSM domain superfamily
Similarity search - Domain/homology
Small-conductance mechanosensitive channel / Small-conductance mechanosensitive channel
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsAngiulli G / Walz T
CitationJournal: Elife / Year: 2020
Title: New approach for membrane protein reconstitution into peptidiscs and basis for their adaptability to different proteins.
Authors: Gabriella Angiulli / Harveer Singh Dhupar / Hiroshi Suzuki / Irvinder Singh Wason / Franck Duong Van Hoa / Thomas Walz /
Abstract: Previously we introduced peptidiscs as an alternative to detergents to stabilize membrane proteins in solution (Carlson et al., 2018). Here, we present 'on-gradient' reconstitution, a new gentle ...Previously we introduced peptidiscs as an alternative to detergents to stabilize membrane proteins in solution (Carlson et al., 2018). Here, we present 'on-gradient' reconstitution, a new gentle approach for the reconstitution of labile membrane-protein complexes, and used it to reconstitute reaction center complexes, demonstrating that peptidiscs can adapt to transmembrane domains of very different sizes and shapes. Using the conventional 'on-bead' approach, we reconstituted proteins MsbA and MscS and find that peptidiscs stabilize them in their native conformation and allow for high-resolution structure determination by cryo-electron microscopy. The structures reveal that peptidisc peptides can arrange around transmembrane proteins differently, thus revealing the structural basis for why peptidiscs can stabilize such a large variety of membrane proteins. Together, our results establish the gentle and easy-to-use peptidiscs as a potentially universal alternative to detergents as a means to stabilize membrane proteins in solution for structural and functional studies.
History
DepositionNov 15, 2019-
Header (metadata) releaseDec 11, 2019-
Map releaseMar 4, 2020-
UpdateMar 6, 2024-
Current statusMar 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6uzh
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_20959.png

Downloads & links

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Map

FileDownload / File: emd_20959.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationmechanosensitive channel MscS reconstituted into peptidiscs
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1 Å/pix.
x 240 pix.
= 240. Å		1 Å/pix.
x 240 pix.
= 240. Å		1 Å/pix.
x 240 pix.
= 240. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.02 / Movie #1: 0.02
Minimum - Maximum-0.08717907 - 0.16942608
Average (Standard dev.)-0.00004210253 (±0.0057593794)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 240.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z111
M x/y/z240240240
origin x/y/z0.0000.0000.000
length x/y/z240.000240.000240.000
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ400400400
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS240240240
D min/max/mean-0.0870.169-0.000

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Supplemental data

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Sample components

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Entire : Small-conductance mechanosensitive channel MscS

EntireName: Small-conductance mechanosensitive channel MscS
Components
  • Complex: Small-conductance mechanosensitive channel MscS
    • Protein or peptide: Small-conductance mechanosensitive channel

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Supramolecule #1: Small-conductance mechanosensitive channel MscS

SupramoleculeName: Small-conductance mechanosensitive channel MscS / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Escherichia coli (E. coli)

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Macromolecule #1: Small-conductance mechanosensitive channel

MacromoleculeName: Small-conductance mechanosensitive channel / type: protein_or_peptide / ID: 1 / Number of copies: 7 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 33.094258 KDa
Recombinant expressionOrganism: Escherichia coli BL21 (bacteria)
SequenceString: MGSSHHHHHH SSGLVPRGSH MEDLNVVDSI NGAGSWLVAN QALLLSYAVN IVAALAIIIV GLIIARMISN AVNRLMISRK IDATVADFL SALVRYGIIA FTLIAALGRV GVQTASVIAV LGAAGLAVGL ALQGSLSNLA AGVLLVMFRP FRAGEYVDLG G VAGTVLSV ...String:
MGSSHHHHHH SSGLVPRGSH MEDLNVVDSI NGAGSWLVAN QALLLSYAVN IVAALAIIIV GLIIARMISN AVNRLMISRK IDATVADFL SALVRYGIIA FTLIAALGRV GVQTASVIAV LGAAGLAVGL ALQGSLSNLA AGVLLVMFRP FRAGEYVDLG G VAGTVLSV QIFSTTMRTA DGKIIVIPNG KIIAGNIINF SREPVRRNEF IIGVAYDSDI DQVKQILTNI IQSEDRILKD RE MTVRLNE LGASSINFVV RVWSNSGDLQ NVYWDVLERI KREFDAAGIS FPYPQMDVNF KRVKEDKAA

UniProtKB: Small-conductance mechanosensitive channel

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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

Concentration0.1 mg/mL
BufferpH: 7.9
Component:
ConcentrationNameFormula
40.0 mMTris-base
150.0 mMsodium chlorideNaCl
Sugar embeddingMaterial: vitreous ice
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Number grids imaged: 1 / Average exposure time: 10.0 sec. / Average electron dose: 80.0 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: -3.5 µm / Nominal defocus min: -1.5 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: EMDB MAP
Final reconstructionApplied symmetry - Point group: C7 (7 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 99883
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final 3D classificationSoftware - Name: RELION (ver. 3.0)
FSC plot (resolution estimation)

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