Effects of Detergent Selection on Stability of a Recombinant Integral Membrane Protein

Abstract

Characterization and structural analysis of integral membrane proteins (IMPs) require detergents that can efficiently disrupt the lipid bilayer while maintaining the native conformation, solubility, and stability of the protein. Selecting an appropriate detergent therefore represents a critical bottleneck in membrane protein biochemistry. In this study, we systematically benchmarked six commonly used detergents—fos-choline-12 (FC-12), lauryldimethylamine-N-oxide (LDAO), n-dodecyl-β-D-maltoside (DDM), n-decyl-β-D-maltoside (DM), lauryl maltose neopentyl glycol (LMNG), and nonyl glucoside (NG)—to determine their suitability for the stabilization of a representative IMP. For each detergent, we assessed solubility, followed by an evaluation of oligomeric homogeneity using size-exclusion chromatography. Purity and yield were quantified to enable a comparative view of detergent-dependent protein recovery. To evaluate structural integrity and stability, we conducted circular dichroism spectroscopy and derived thermal unfolding profiles to assess melting temperatures. Our results reveal clear trade-offs between detergents that excel in membrane solubilization and those that better preserve conformational stability, with no single detergent outperforming across all metrics. While NG caused protein precipitation, other detergents maintained protein solubility but produced distinct SEC profiles and apparent thermal stabilities. LDAO and LMNG provided the highest apparent melting temperatures, while DM showed the lowest. These findings provide a practical framework for detergent selection and optimization, and offer broadly applicable insights for researchers pursuing structural, functional, or biophysical studies of other IMPs