4HWA

Crystal Structure of Escherichia coli MscS Wildtype (Open State)

Summary for 4HWA

• Entry DOI: 10.2210/pdb4hwa/pdb
• Related: 2OAU 2VV5 4HW9
• Descriptor: Small-conductance mechanosensitive channel (1 entity in total)
• Functional Keywords: mechanosensitive channel, membrane, membrane protein
• Biological source: Escherichia coli
• Cellular location: Cell inner membrane; Multi-pass membrane protein: P0C0S1
• Total number of polymer chains: 7
• Total formula weight: 231659.81

Authors

Lai, J.Y.,Poon, Y.S.,Kaiser, J.,Rees, D.C. (deposition date: 2012-11-07, release date: 2013-02-13, Last modification date: 2024-02-28)

Primary citation

Lai, J.Y.,Poon, Y.S.,Kaiser, J.T.,Rees, D.C.
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.
Protein Sci., 22:502-509, 2013

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 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.

PubMed: 23339071
DOI: 10.1002/pro.2222

Experimental method

X-RAY DIFFRACTION (4.37 Å)