Advances in membrane protein separation and purification: Emerging techniques and strategies

Abstract

Membrane protein separation and purification techniques are essential for studying membrane proteins, which are critical for cellular processes such as transport, signaling, and energy conversion. However, the inherent hydrophobicity, heterogeneity, and instability of membrane proteins pose challenges to their purification. This review explores a variety of methods including membrane filtration, chromatography, electrophoresis, and ultrafiltration for isolating membrane proteins. Detergent-free techniques, such as amphipols, nanodiscs, and bicelle-based methods, are highlighted for their effectiveness in maintaining protein stability and native conformation. Additionally, advanced approaches such as fusion tags, protein engineering, and mass spectrometry offer improvements in solubility and stability. These techniques are pivotal in drug discovery, structural biology, and functional analysis of membrane proteins. Ongoing innovations in these areas aim to overcome challenges related to protein stability and purification efficiency.