Anionic branched surfactants as alternative denaturing agents for protein separations.

Area of Science:

• Biochemistry
• Physical Chemistry
• Analytical Chemistry

Background:

• Surfactants are crucial for protein denaturation and analysis.
• Branched alkyl surfactants offer unique properties compared to linear ones.
• Understanding surfactant-protein interactions is key for optimizing biochemical assays.

Purpose of the Study:

• To investigate the denaturation effects of three branched alkyl surfactants on model proteins.
• To analyze how surfactant structure influences protein secondary structure and complex morphology.
• To evaluate the impact of these surfactants on protein separation via polyacrylamide gel electrophoresis (PAGE).

Main Methods:

• Circular dichroism (CD) spectroscopy to assess secondary structure changes.
• Small-angle X-ray scattering (SAXS) to determine the shape of protein-surfactant complexes.
• Polyacrylamide gel electrophoresis (PAGE) to analyze protein migration patterns.

Main Results:

• Sodium 2-butyloctyl sulfate (2-BOS) demonstrated a greater disruption of protein secondary structure.
• Protein-surfactant complex shapes varied from "pearl necklace" to ellipsoidal based on the surfactant used.
• Branching in surfactants (2-BOS and 3,7-DMOS) led to anomalous migration in PAGE, deviating from expected mobility.

Conclusions:

• 2-BOS induces more significant protein modification during denaturation compared to 2-EHS and 3,7-DMOS.
• The study provides insights into surfactant-driven protein structural changes.
• Findings can guide the development of improved surfactants for protein electrophoresis and biochemical applications.