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- PDB-6uzh: Cryo-EM structure of mechanosensitive channel MscS reconstituted ... -

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Basic information

Entry
Database: PDB / ID: 6uzh
TitleCryo-EM structure of mechanosensitive channel MscS reconstituted into peptidiscs
ComponentsSmall-conductance mechanosensitive channel
KeywordsTRANSPORT PROTEIN / membrane protein / mechanosensitive channels / MscS / membrane mimetic / peptidisc
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)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsAngiulli, G. / Walz, T. / Dhupar, H.S. / Suzuki, H. / Wason, I.S. / Duong Van Hoa, F.
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, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 4, 2020Provider: repository / Type: Initial release
Revision 1.1Mar 18, 2020Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.2Mar 6, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Assembly

Deposited unit
A: Small-conductance mechanosensitive channel
B: Small-conductance mechanosensitive channel
C: Small-conductance mechanosensitive channel
D: Small-conductance mechanosensitive channel
E: Small-conductance mechanosensitive channel
F: Small-conductance mechanosensitive channel
G: Small-conductance mechanosensitive channel


Theoretical massNumber of molelcules
Total (without water)231,6607
Polymers231,6607
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area41210 Å2
ΔGint-243 kcal/mol
Surface area75710 Å2

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Components

#1: Protein
Small-conductance mechanosensitive channel


Mass: 33094.258 Da / Num. of mol.: 7
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: A1WK_03961 / Plasmid: pET28 / Production host: Escherichia coli BL21 (bacteria) / References: UniProt: S1GZQ2, UniProt: P0C0S1*PLUS

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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: Small-conductance mechanosensitive channel MscS / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli BL21 (bacteria) / Strain: BL21 / Plasmid: pET28
Buffer solutionpH: 7.9
Buffer component
IDConc.NameFormulaBuffer-ID
140 mMTris-base1
2150 mMsodium chlorideNaCl1
SpecimenConc.: 0.1 mg/ml / Embedding applied: YES / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3
EM embeddingMaterial: vitreous ice
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 90 % / Chamber temperature: 277 K

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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 defocus max: -3500 nm / Nominal defocus min: -1500 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 10 sec. / Electron dose: 80 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1

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Processing

SoftwareName: PHENIX / Version: 1.14_3260: / Classification: refinement
EM software
IDNameVersionCategory
1Gautomatchv0.56_sm20_cu7.5particle selection
2SerialEMimage acquisition
4CTFFIND4.1.8CTF correction
10RELION3initial Euler assignment
11RELION3final Euler assignment
12RELION3classification
13RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C7 (7 fold cyclic)
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 99883 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00813748
ELECTRON MICROSCOPYf_angle_d0.89818641
ELECTRON MICROSCOPYf_dihedral_angle_d4.8358260
ELECTRON MICROSCOPYf_chiral_restr0.0582282
ELECTRON MICROSCOPYf_plane_restr0.0062366

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