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2022 - Soybean meal peptides regulated membrane phase of giant unilamellar vesicles: A key role for bilayer amphipathic region localization

icon vpp Vesicle Prep Pro Publication in Food Research International (2022)

Authors:
Jiang F., Liu J., Du Z., Liu X., Shang X., Yu Y., Zhang T.

Journal:
Food Research International (2022) doi: 10.1016/j.foodres.2022.111924


Abstract:

Membrane phase separation forms liquid-ordered (Lo) and liquid-disordered (Ld) phases and is involved in cellular processes and functions. Our previous study has confirmed that peptides can regulate phase separation by increasing the Lo phase. However, the specific mechanisms underlying the phase separation regulation of peptides remain poorly understood. This study aimed to explore the effect of soybean meal peptides on phase separation and illustrate the correlation between phase regulation and membrane localization of the peptides. Phase separation was studied by giant unilamellar vesicles (GUVs), and membrane localization of the peptides was detected by steady-state fluorescence quenching. Our results revealed that peptides YYK, CLA, and SLW enhanced the Lo phase while WLQ decreased the Lo phase. The localization in the membrane amphiphilic region of the peptides played a crucial role in their regulation of phase separation. The more localization of the peptides (YYK, CLA, and SLW) in the membrane amphiphilic region, the stronger the capacity to increase the Lo phase.

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