Unraveling the Biophysical Mechanisms of How Antiviral Detergents Disrupt Supported Lipid Membranes: Toward Replacing Triton X-100

Langmuir. 2024 Mar 26;40(12):6524-6536. doi: 10.1021/acs.langmuir.4c00174. Epub 2024 Mar 13.

Abstract

Triton X-100 (TX-100) is a membrane-disrupting detergent that is widely used to inactivate membrane-enveloped viral pathogens, yet is being phased out due to environmental safety concerns. Intense efforts are underway to discover regulatory acceptable detergents to replace TX-100, but there is scarce mechanistic understanding about how these other detergents disrupt phospholipid membranes and hence which ones are suitable to replace TX-100 from a biophysical interaction perspective. Herein, using the quartz crystal microbalance-dissipation (QCM-D) and electrochemical impedance spectroscopy (EIS) techniques in combination with supported lipid membrane platforms, we characterized the membrane-disruptive properties of a panel of TX-100 replacement candidates with varying antiviral activities and identified two distinct classes of membrane-interacting detergents with different critical micelle concentration (CMC) dependencies and biophysical mechanisms. While all tested detergents formed micelles, only a subset of the detergents caused CMC-dependent membrane solubilization similarly to that of TX-100, whereas other detergents adsorbed irreversibly to lipid membrane interfaces in a CMC-independent manner. We compared these biophysical results to virus inactivation data, which led us to identify that certain membrane-interaction profiles contribute to greater antiviral activity and such insights can help with the discovery and validation of antiviral detergents to replace TX-100.

MeSH terms

  • Antiviral Agents / pharmacology
  • Detergents* / chemistry
  • Detergents* / pharmacology
  • Lipid Bilayers / chemistry
  • Micelles
  • Octoxynol / chemistry
  • Octoxynol / pharmacology
  • Phospholipids* / chemistry
  • Polyethylene Glycols*

Substances

  • Octoxynol
  • Detergents
  • polyethylene glycol monooctylphenyl ether
  • Phospholipids
  • Micelles
  • Antiviral Agents
  • Lipid Bilayers
  • Polyethylene Glycols