GhoT of the GhoT/GhoS toxin/antitoxin system damages lipid membranes by forming transient pores

Jun Seob Kim, Allen B. Schantz, Sooyeon Song, Manish Kumar, Thomas Keith Wood

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

GhoT is a bacterial toxin of the type V toxin/antitoxin system that allows Escherichia coli to reduce its metabolism in response to oxidative and bile stress. GhoT functions by increasing membrane permeability and reducing both ATP levels and the proton motive force. However, how GhoT damages the inner membrane has not been elucidated. Here we investigated how GhoT damages membranes by studying its interaction with lipid bilayers and determined that GhoT does not cause macroscopic disruption of the lipid bilayer to increase membrane permeability to the dye carboxyfluorescein. Using circular dichroism, we found that GhoT forms an alpha helical structure in lipid bilayers that agrees with the structure predicted by the I-TASSER protein structure prediction program. The structure generated using I-TASSER was used to conduct coarse-grained molecular dynamics simulations, which indicate that GhoT damages the cell membrane, as a multimer, by forming transient transmembrane pores.

Original languageEnglish (US)
Pages (from-to)467-472
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume497
Issue number2
DOIs
StatePublished - Mar 4 2018

Fingerprint

Antitoxins
Membrane Lipids
Lipid bilayers
Lipid Bilayers
Membranes
Permeability
Bacterial Toxins
Proton-Motive Force
Molecular Dynamics Simulation
Cell membranes
Circular Dichroism
Metabolism
Bile
Escherichia coli
Molecular dynamics
Protons
Oxidative Stress
Coloring Agents
Adenosine Triphosphate
Cell Membrane

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Kim, Jun Seob ; Schantz, Allen B. ; Song, Sooyeon ; Kumar, Manish ; Wood, Thomas Keith. / GhoT of the GhoT/GhoS toxin/antitoxin system damages lipid membranes by forming transient pores. In: Biochemical and Biophysical Research Communications. 2018 ; Vol. 497, No. 2. pp. 467-472.
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GhoT of the GhoT/GhoS toxin/antitoxin system damages lipid membranes by forming transient pores. / Kim, Jun Seob; Schantz, Allen B.; Song, Sooyeon; Kumar, Manish; Wood, Thomas Keith.

In: Biochemical and Biophysical Research Communications, Vol. 497, No. 2, 04.03.2018, p. 467-472.

Research output: Contribution to journalArticle

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