Critical Role of Molecular Packing in Lo Phase Membrane Solubilization
Membrane solubilization induced by Triton X-100 (TX-100) was investigated. Different membrane compositions and phase states were studied along the detergent titration. Expected solubilization profiles were obtained but new information is provided. The fluorescence of nitrobenzoxadiazole (NBD)-labele...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-07-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/13/7/652 |
| _version_ | 1797588336278241280 |
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| author | Nicolas Puff |
| author_facet | Nicolas Puff |
| author_sort | Nicolas Puff |
| collection | DOAJ |
| description | Membrane solubilization induced by Triton X-100 (TX-100) was investigated. Different membrane compositions and phase states were studied along the detergent titration. Expected solubilization profiles were obtained but new information is provided. The fluorescence of nitrobenzoxadiazole (NBD)-labeled lipids indicates that the liquid-ordered (Lo)/liquid-disordered (Ld) phase coexistence is barely unaffected at sub-solubilizing detergent concentrations and highlights the vesicle-to-micelle transition. Moreover, the location of the NBD group in the bilayer emphasizes a detergent–membrane interaction in the case of the insoluble Lo phase membrane. It has also been shown that the molecular packing of the membrane loosens in the presence of TX-100, regardless of the solubilization profile. Motivated by studies on GPMVs, the solubilization of less ordered Lo phase membranes was considered in order to improve the effect of molecular packing on the extent of solubilization. Membranes composed of SM and Chol in an equimolar ratio doped with different amounts of PC were studied. The more ordered the Lo phase membrane is in the absence of detergent, the less likely it is to be solubilized. Furthermore, and in contrast to what is observed for membranes exhibiting an Lo/Ld phase coexistence, a very small decrease in the molecular packing of the Lo phase membrane radically modifies the extent of solubilization. These results have implications for the reliability of TX-100 insolubility as a method to detect ordered domains. |
| first_indexed | 2024-03-11T00:50:32Z |
| format | Article |
| id | doaj.art-17f0f453cfd54541be33f9b575e6ac8e |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-11T00:50:32Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-17f0f453cfd54541be33f9b575e6ac8e2023-11-18T20:26:23ZengMDPI AGMembranes2077-03752023-07-0113765210.3390/membranes13070652Critical Role of Molecular Packing in Lo Phase Membrane SolubilizationNicolas Puff0Faculté des Sciences et Ingénierie, Sorbonne Université, UFR 925 Physics, F-75005 Paris, FranceMembrane solubilization induced by Triton X-100 (TX-100) was investigated. Different membrane compositions and phase states were studied along the detergent titration. Expected solubilization profiles were obtained but new information is provided. The fluorescence of nitrobenzoxadiazole (NBD)-labeled lipids indicates that the liquid-ordered (Lo)/liquid-disordered (Ld) phase coexistence is barely unaffected at sub-solubilizing detergent concentrations and highlights the vesicle-to-micelle transition. Moreover, the location of the NBD group in the bilayer emphasizes a detergent–membrane interaction in the case of the insoluble Lo phase membrane. It has also been shown that the molecular packing of the membrane loosens in the presence of TX-100, regardless of the solubilization profile. Motivated by studies on GPMVs, the solubilization of less ordered Lo phase membranes was considered in order to improve the effect of molecular packing on the extent of solubilization. Membranes composed of SM and Chol in an equimolar ratio doped with different amounts of PC were studied. The more ordered the Lo phase membrane is in the absence of detergent, the less likely it is to be solubilized. Furthermore, and in contrast to what is observed for membranes exhibiting an Lo/Ld phase coexistence, a very small decrease in the molecular packing of the Lo phase membrane radically modifies the extent of solubilization. These results have implications for the reliability of TX-100 insolubility as a method to detect ordered domains.https://www.mdpi.com/2077-0375/13/7/652membrane solubilizationTriton X-100liquid-ordered phaseLaurdanLUVs |
| spellingShingle | Nicolas Puff Critical Role of Molecular Packing in Lo Phase Membrane Solubilization Membranes membrane solubilization Triton X-100 liquid-ordered phase Laurdan LUVs |
| title | Critical Role of Molecular Packing in Lo Phase Membrane Solubilization |
| title_full | Critical Role of Molecular Packing in Lo Phase Membrane Solubilization |
| title_fullStr | Critical Role of Molecular Packing in Lo Phase Membrane Solubilization |
| title_full_unstemmed | Critical Role of Molecular Packing in Lo Phase Membrane Solubilization |
| title_short | Critical Role of Molecular Packing in Lo Phase Membrane Solubilization |
| title_sort | critical role of molecular packing in lo phase membrane solubilization |
| topic | membrane solubilization Triton X-100 liquid-ordered phase Laurdan LUVs |
| url | https://www.mdpi.com/2077-0375/13/7/652 |
| work_keys_str_mv | AT nicolaspuff criticalroleofmolecularpackinginlophasemembranesolubilization |