2VV5 | pdb_00002vv5

The open structure of MscS

• PDB DOI: https://doi.org/10.2210/pdb2VV5/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): Yes 
• Membrane Protein: Yes  PDBTMMemProtMDmpstruc


• Deposited: 2008-06-03 Released: 2008-08-05 
• Deposition Author(s): Wang, W., Dong, C., Johnson, K.A., Naismith, J.H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.45 Å
• R-Value Free: 
  0.312 (Depositor), 0.277 (DCC) 
• R-Value Work: 
  0.293 (Depositor), 0.263 (DCC) 
• R-Value Observed: 
  0.294 (Depositor) 

Starting Model: experimental

Literature

The Structure of an Open Form of an E. Coli Mechanosensitive Channel at 3.45 A Resolution.

Wang, W., Black, S.S., Edwards, M.D., Miller, S., Morrison, E.L., Bartlett, W., Dong, C., Naismith, J.H., Booth, I.R.

(2008) Science 321: 1179

• PubMed: 18755969 
• DOI: https://doi.org/10.1126/science.1159262
• Primary Citation Related Structures: 
  2VV5


• PubMed Abstract: 
  

  How ion channels are gated to regulate ion flux in and out of cells is the subject of intense interest. The Escherichia coli mechanosensitive channel, MscS, opens to allow rapid ion efflux, relieving the turgor pressure that would otherwise destroy the cell. We present a 3.45 angstrom-resolution structure for the MscS channel in an open conformation. This structure has a pore diameter of approximately 13 angstroms created by substantial rotational rearrangement of the three transmembrane helices. The structure suggests a molecular mechanism that underlies MscS gating and its decay of conductivity during prolonged activation. Support for this mechanism is provided by single-channel analysis of mutants with altered gating characteristics.

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Organizational Affiliation: 
• Centre for Biomolecular Sciences, The North Haugh, University of St. Andrews, KY16 9ST, Scotland, UK.

Biological Assembly 1  

Global Symmetry: Cyclic - C7  (Explore in 3D)
Global Stoichiometry: Homo 7-mer - A7 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content 

• Total Structure Weight: 216.66 kDa 
• Atom Count: 13,692 
• Modeled Residue Count: 1,799 
• Deposited Residue Count: 2,002 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SMALL-CONDUCTANCE MECHANOSENSITIVE CHANNEL	A, B, C, D, E, F, G	286	Escherichia coli	Mutation(s): 1  Membrane Entity: Yes
UniProt
Find proteins for P0C0S1 (Escherichia coli (strain K12)) Explore P0C0S1  Go to UniProtKB:  P0C0S1

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.45 Å
• R-Value Free:  0.312 (Depositor), 0.277 (DCC) 
• R-Value Work:  0.293 (Depositor), 0.263 (DCC) 
• R-Value Observed: 0.294 (Depositor) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 230.88	α = 90
b = 126.62	β = 90.42
c = 123.22	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2008-08-05 
Deposition Author(s): Wang, W., Dong, C., Johnson, K.A., Naismith, J.H.

Revision History  

• Version 1.0: 2008-08-05
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.2: 2023-12-13
  Changes: Data collection, Database references, Other, Refinement description