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Spectroscopic Methods for Detecting Conformational Changes During Sec18-Lipid Interactions.

Rutilio Fratti1, Jorge D Calderin2, Matthew L Starr3

  • 1Dept of Biochemistry & Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA. rfratti@illinois.edu.

Methods in Molecular Biology (Clifton, N.J.)
|January 13, 2025
PubMed
Summary
This summary is machine-generated.

Sec18 (NSF) protein activation by phosphatidic acid (PA) is crucial for vacuole fusion. New spectroscopy methods rapidly screen protein-lipid interactions by measuring Sec18 conformational changes upon PA binding.

Keywords:
Membrane fusionNSFPah1Phosphatidic acidSNARESec18

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Biophysics

Background:

  • Vacuole fusion relies on SNARE proteins, which are activated by the AAA+ protein Sec18 (NSF).
  • Sec18 (NSF) interacts with phosphatidic acid (PA) on vacuoles, undergoing conformational changes that sequester it away from SNARE complexes.
  • Pah1 phosphatase converts PA to diacylglycerol, releasing Sec18 (NSF) to prime SNAREs for membrane fusion.

Purpose of the Study:

  • To develop and validate spectroscopy-based methods for distinguishing Sec18 (NSF) conformational changes from secondary structure alterations during phosphatidic acid (PA) binding.
  • To provide rapid, affordable assays for screening protein-lipid interactions using purified components.

Main Methods:

  • 1-anilino-8-naphthalenesulfonate (ANS) spectroscopy to detect hydrophobic region exposure.
  • Intrinsic tryptophan fluorescence to monitor conformational shifts.
  • Differential scanning fluorometry to assess protein stability changes.
  • Circular dichroism spectroscopy to analyze secondary structure modifications.

Main Results:

  • The described methods successfully differentiate conformational changes from secondary structure alterations in Sec18 (NSF) upon binding phosphatidic acid (PA).
  • These assays utilize purified Sec18 (NSF) and short-chain soluble lipids, enabling rapid and cost-effective analysis.
  • The techniques are suitable for screening the impact of specific protein-lipid interactions on protein conformation.

Conclusions:

  • Spectroscopy-based assays offer a robust approach to study Sec18 (NSF) regulation by phosphatidic acid (PA).
  • These methods facilitate the investigation of protein conformational dynamics in response to lipid binding.
  • The developed assays provide valuable tools for understanding the molecular mechanisms of vacuole fusion and related processes.