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An Upside Down View of Cholesterol's Condensing Effect: Does Surface Occupancy Play a Role?
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Date
2010-04-20
Author
Janout, Vaclav
Türkyılmaz, Serhan
Wang, Minghui
Wang, Yao
Manaka, Yuichi
Regen, Steven L.
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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The condensing action or cholesterol has been compared with that of a structural isomer having its hydroxyl group located at the C-25 position (i.e., 25-OH'), that is, an isomer favoring an "upside down" orientation in lipid membranes. Surface pressure area isotherms of mixed monolayers made from 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DM PC)/cholesterol and DM PC/25-OH' have established that 25-OH' has a weaker condensing effect than cholesterol. Nearest-neighbor recognition measurements in liposomes made from 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) have also shown that 25-OH' has a weaker condensing effect in the physiologically relevant fluid bilayer state. These findings provide support for surface occupancy playing a role in the condensing action of cholesterol.
Subject Keywords
Liquid-ordered phase
,
Membranes
,
Bilayers
,
Phospholipids
URI
https://hdl.handle.net/11511/45967
Journal
LANGMUIR
DOI
https://doi.org/10.1021/la100878s
Collections
Department of Chemistry, Article
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V. Janout, S. Türkyılmaz, M. Wang, Y. Wang, Y. Manaka, and S. L. Regen, “An Upside Down View of Cholesterol’s Condensing Effect: Does Surface Occupancy Play a Role?,”
LANGMUIR
, pp. 5316–5318, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/45967.