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- PDB-6pwp: MscS Nanodisc -

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Basic information

Entry
Database: PDB / ID: 6pwp
TitleMscS Nanodisc
ComponentsSmall-conductance mechanosensitive channel
KeywordsMEMBRANE PROTEIN / MscS / Nanodisc / Mechanosensitive Channel of Small Conductance / Mechanosensitive / Channel
Function / homology
Function and homology information


intracellular water homeostasis / mechanosensitive monoatomic ion channel activity / protein homooligomerization / 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
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.1 Å
AuthorsReddy, B.G. / Perozo, E.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)R01 GM133191 United States
CitationJournal: Elife / Year: 2019
Title: Molecular basis of force-from-lipids gating in the mechanosensitive channel MscS.
Authors: Bharat Reddy / Navid Bavi / Allen Lu / Yeonwoo Park / Eduardo Perozo /
Abstract: Prokaryotic mechanosensitive (MS) channels open by sensing the physical state of the membrane. As such, lipid-protein interactions represent the defining molecular process underlying ...Prokaryotic mechanosensitive (MS) channels open by sensing the physical state of the membrane. As such, lipid-protein interactions represent the defining molecular process underlying mechanotransduction. Here, we describe cryo-electron microscopy (cryo-EM) structures of the small-conductance mechanosensitive channel (MscS) in nanodiscs (ND). They reveal a novel membrane-anchoring fold that plays a significant role in channel activation and establish a new location for the lipid bilayer, shifted ~14 Å from previous consensus placements. Two types of lipid densities are explicitly observed. A phospholipid that 'hooks' the top of each TM2-TM3 hairpin and likely plays a role in force sensing, and a bundle of acyl chains occluding the permeation path above the L105 cuff. These observations reshape our understanding of force-from-lipids gating in MscS and highlight the key role of allosteric interactions between TM segments and phospholipids bound to key dynamic components of the channel.
History
DepositionJul 23, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 8, 2020Provider: repository / Type: Initial release
Revision 1.1Mar 20, 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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Structure visualization

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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)218,4367
Polymers218,4367
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area37760 Å2
ΔGint-224 kcal/mol
Surface area98670 Å2

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Components

#1: Protein
Small-conductance mechanosensitive channel


Mass: 31205.178 Da / Num. of mol.: 7
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (strain K12) (bacteria)
Strain: K12 / Gene: mscS, yggB, b2924, JW2891 / Production host: Escherichia coli (E. coli) / References: UniProt: P0C0S1

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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: Mechanosensitive Channel of Small Conductance / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightUnits: KILODALTONS/NANOMETER / Experimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.4
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295 K
Details: 22C. Blot Force 3 for 3 seconds. Double application with a blotting between applications.

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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
Image recordingElectron dose: 50 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)
Image scansMovie frames/image: 50

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Processing

SoftwareName: PHENIX / Version: 1.15.2_3472: / Classification: refinement
EM softwareName: RELION / Version: 3.0.6 / Category: 3D reconstruction
CTF correctionType: NONE
SymmetryPoint symmetry: C7 (7 fold cyclic)
3D reconstructionResolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 15071 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00730653
ELECTRON MICROSCOPYf_angle_d1.45855545
ELECTRON MICROSCOPYf_dihedral_angle_d11.02612068
ELECTRON MICROSCOPYf_chiral_restr0.052513
ELECTRON MICROSCOPYf_plane_restr0.0034522

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