Trichosanthin's interfacial interactions with phospholipids : A monolayer study

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Original languageEnglish
Pages (from-to)105-112
Journal / PublicationColloids and Surfaces B: Biointerfaces
Issue number3
Publication statusPublished - 10 Dec 2004


Lipid monolayer at the air/water interface, as half a membrane, was used here to investigate the interaction between trichosanthin (TCS), a ribosome inactivating protein, and phospholipid membrane. First, the protein adsorption experiments showed that the negatively charged DPPG caused obvious enrichment of TCS beneath the monolayer, indicating electrostatic attraction between TCS and the negatively charged phospholipid. Second, when TCS was incorporated into the phospholipid monolayer, it could not be completely squeezed out until the monolayer collapsed. The results were demonstrated to be irrelative with the phospholipid headgroup, suggesting a strong hydrophobic force between TCS and phospholipid hydrocarbon chain was involved in the interaction. Third, the protein/membrane interaction was further studied with fluorescence microscope. The results showed that TCS could penetrate into both the condensed and the fluid phase of the DPPG monolayer under low pH condition and eventually resulted in a homogeneous phospholipid phase. The breakage of ordered packing of phospholipid by TCS may be responsible for this homogenizing effect. © 2004 Elsevier B.V. All rights reserved.

Research Area(s)

  • 1,2-dimyristoyl-sn-glycero-3-phosphocholine, 1,2-dimyristoyl-sn-glycero-3-phosphoglycerol, 1,2-dipalmitoyl-sn-glycero-3- phosphocholine, DMPC, DMPG, DPPC, DPPG, FITC, fluorescein isothiocyanate, ribosome-inactivating protein, RIP, TCS, trichosanthin