4AGF

MTSSL spin labeled L124C mutant of MscS in the open form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.7 Å
  • R-Value Free: 0.339 
  • R-Value Work: 0.334 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Conformational State of the Mscs Mechanosensitive Channel in Solution Revealed by Pulsed Electron-Electron Double Resonance (Peldor) Spectroscopy.

Pliotas, C.Ward, R.Branigan, E.Rasmussen, A.Hagelueken, G.Huang, H.Black, S.S.Booth, I.R.Schiemann, O.Naismith, J.H.

(2012) Proc.Natl.Acad.Sci.USA 109: E2675

  • DOI: 10.1073/pnas.1202286109
  • Primary Citation of Related Structures:  4AGE

  • PubMed Abstract: 
  • The heptameric mechanosensitive channel of small conductance (MscS) provides a critical function in Escherichia coli where it opens in response to increased bilayer tension. Three approaches have defined different closed and open structures of the ch ...

    The heptameric mechanosensitive channel of small conductance (MscS) provides a critical function in Escherichia coli where it opens in response to increased bilayer tension. Three approaches have defined different closed and open structures of the channel, resulting in mutually incompatible models of gating. We have attached spin labels to cysteine mutants on key secondary structural elements specifically chosen to discriminate between the competing models. The resulting pulsed electron-electron double resonance (PELDOR) spectra matched predicted distance distributions for the open crystal structure of MscS. The fit for the predictions by structural models of MscS derived by other techniques was not convincing. The assignment of MscS as open in detergent by PELDOR was unexpected but is supported by two crystal structures of spin-labeled MscS. PELDOR is therefore shown to be a powerful experimental tool to interrogate the conformation of transmembrane regions of integral membrane proteins.


    Organizational Affiliation

    Biomedical Sciences Research Complex, University of St Andrews, North Haugh, St Andrews KY16 9ST, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SMALL-CONDUCTANCE MECHANOSENSITIVE CHANNEL
A, B, C, D, E, F, G
286Escherichia coli (strain K12)Gene Names: mscS (yggB)
Find proteins for P0C0S1 (Escherichia coli (strain K12))
Go to UniProtKB:  P0C0S1
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.7 Å
  • R-Value Free: 0.339 
  • R-Value Work: 0.334 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 128.840α = 90.00
b = 150.220β = 90.00
c = 175.810γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-08-15
    Type: Initial release
  • Version 1.1: 2012-09-19
    Type: Database references, Other
  • Version 1.2: 2012-10-17
    Type: Database references