4HWA

Crystal Structure of Escherichia coli MscS Wildtype (Open State)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.37 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.267 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Open and shut: crystal structures of the dodecylmaltoside solubilized mechanosensitive channel of small conductance from Escherichia coli and Helicobacter pylori at 4.4 A and 4.1 A resolutions.

Lai, J.Y.Poon, Y.S.Kaiser, J.T.Rees, D.C.

(2013) Protein Sci. 22: 502-509

  • DOI: 10.1002/pro.2222
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The mechanosensitive channel of small conductance (MscS) contributes to the survival of bacteria during osmotic downshock by transiently opening large diameter pores for the efflux of cellular contents before the membrane ruptures. Two crystal struct ...

    The mechanosensitive channel of small conductance (MscS) contributes to the survival of bacteria during osmotic downshock by transiently opening large diameter pores for the efflux of cellular contents before the membrane ruptures. Two crystal structures of the Escherichia coli MscS are currently available, the wild type protein in a nonconducting state at 3.7 Å resolution (Bass et al., Science 2002; 298:1582-1587) and the Ala106Val variant in an open state at 3.45 Å resolution (Wang et al., Science 2008; 321:1179-1183). Both structures used protein solubilized in the detergent fos-choline-14. We report here crystal structures of MscS from E. coli and Helicobacter pylori solubilized in the detergent β-dodecylmaltoside at resolutions of 4.4 and 4.2 Å, respectively. While the cytoplasmic domains are unchanged in these structures, distinct conformations of the transmembrane domains are observed. Intriguingly, β-dodecylmaltoside solubilized wild type E. coli MscS adopts the open state structure of A106V E. coli MscS, while H. pylori MscS resembles the nonconducting state structure observed for fos-choline-14 solubilized E. coli MscS. These results highlight the sensitivity of membrane protein conformational equilibria to variations in detergent, crystallization conditions, and protein sequence.


    Organizational Affiliation

    Division of Chemistry and Chemical Engineering, Howard Hughes Medical Institute, California Institute of Technology, Pasadena, California 91125, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Small-conductance mechanosensitive channel
A, B, C, D, E, F, G
306Escherichia coli (strain K12)Mutation(s): 0 
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: 4.37 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.267 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 128.240α = 90.00
b = 149.970β = 90.00
c = 175.780γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
XDSdata reduction
Blu-Icedata collection
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-02-13
    Type: Initial release
  • Version 1.1: 2013-06-19
    Type: Database references