5AJI

MscS D67R1 high resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.99 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.245 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The Role of Lipids in Mechanosensation.

Pliotas, C.Dahl, A.C.E.Rasmussen, T.Mahendran, K.R.Smith, T.K.Marius, P.Gault, J.Banda, T.Rasmussen, A.Miller, S.Robinson, C.V.Bayley, H.Sansom, M.S.P.Booth, I.R.Naismith, J.H.

(2015) Nat Struct Mol Biol 22: 991

  • DOI: 10.1038/nsmb.3120
  • Primary Citation of Related Structures:  
    5AJI

  • PubMed Abstract: 
  • The ability of proteins to sense membrane tension is pervasive in biology. A higher-resolution structure of the Escherichia coli small-conductance mechanosensitive channel MscS identifies alkyl chains inside pockets formed by the transmembrane helice ...

    The ability of proteins to sense membrane tension is pervasive in biology. A higher-resolution structure of the Escherichia coli small-conductance mechanosensitive channel MscS identifies alkyl chains inside pockets formed by the transmembrane helices (TMs). Purified MscS contains E. coli lipids, and fluorescence quenching demonstrates that phospholipid acyl chains exchange between bilayer and TM pockets. Molecular dynamics and biophysical analyses show that the volume of the pockets and thus the number of lipid acyl chains within them decreases upon channel opening. Phospholipids with one acyl chain per head group (lysolipids) displace normal phospholipids (with two acyl chains) from MscS pockets and trigger channel opening. We propose that the extent of acyl-chain interdigitation in these pockets determines the conformation of MscS. When interdigitation is perturbed by increased membrane tension or by lysolipids, the closed state becomes unstable, and the channel gates.


    Organizational Affiliation

    State Key Laboratory of Biotherapy, Sichuan University, Chengdu, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SMALL-CONDUCTANCE MECHANOSENSITIVE CHANNELABCDEFG286Escherichia coliMutation(s): 1 
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Mechanosensitive
Protein: 
MscS voltage-modulated mechanosensitive channel, D67R1 mutant
Find proteins for P0C0S1 (Escherichia coli (strain K12))
Explore P0C0S1 
Go to UniProtKB:  P0C0S1
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
D10
Query on D10

Download CCD File 
C, D, G
DECANE
C10 H22
DIOQZVSQGTUSAI-UHFFFAOYSA-N
 Ligand Interaction
OCT
Query on OCT

Download CCD File 
A, E
N-OCTANE
C8 H18
TVMXDCGIABBOFY-UHFFFAOYSA-N
 Ligand Interaction
HEX
Query on HEX

Download CCD File 
A, B, C, D, E, F
HEXANE
C6 H14
VLKZOEOYAKHREP-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
R1A
Query on R1A
A,B,C,D,E,F,GL-PEPTIDE LINKINGC12 H21 N2 O3 S2CYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.99 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.245 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 126.33α = 90
b = 149.09β = 90
c = 173.82γ = 90
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-08
    Type: Initial release
  • Version 1.1: 2015-11-18
    Changes: Database references
  • Version 1.2: 2015-12-23
    Changes: Database references