Nanoscale Membrane Domain Formation Driven by Cholesterol

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http://hdl.handle.net/10138/185239

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Javanainen , M , Martinez-Seara , H & Vattulainen , I 2017 , ' Nanoscale Membrane Domain Formation Driven by Cholesterol ' , Scientific Reports , vol. 7 , 1143 . https://doi.org/10.1038/s41598-017-01247-9

Title: Nanoscale Membrane Domain Formation Driven by Cholesterol
Author: Javanainen, Matti; Martinez-Seara, Hector; Vattulainen, Ilpo
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2017-04-25
Language: eng
Number of pages: 10
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/185239
Abstract: Biological membranes generate specific functions through compartmentalized regions such as cholesterol-enriched membrane nanodomains that host selected proteins. Despite the biological significance of nanodomains, details on their structure remain elusive. They cannot be observed via microscopic experimental techniques due to their small size, yet there is also a lack of atomistic simulation models able to describe spontaneous nanodomain formation in sufficiently simple but biologically relevant complex membranes. Here we use atomistic simulations to consider a binary mixture of saturated dipalmitoylphosphatidylcholine and cholesterol - the "minimal standard" for nanodomain formation. The simulations reveal how cholesterol drives the formation of fluid cholesterol-rich nanodomains hosting hexagonally packed cholesterol-poor lipid nanoclusters, both of which show registration between the membrane leaflets. The complex nanodomain substructure forms when cholesterol positions itself in the domain boundary region. Here cholesterol can also readily flip-flop across the membrane. Most importantly, replacing cholesterol with a sterol characterized by a less asymmetric ring region impairs the emergence of nanodomains. The model considered explains a plethora of controversial experimental results and provides an excellent basis for further computational studies on nanodomains. Furthermore, the results highlight the role of cholesterol as a key player in the modulation of nanodomains for membrane protein function.
Subject: MOLECULAR-DYNAMICS SIMULATIONS
DIFFERENTIAL SCANNING CALORIMETRY
PULMONARY SURFACTANT MEMBRANES
LIPID-BILAYERS
PHASE-BEHAVIOR
PHOSPHATIDYLCHOLINE BILAYERS
MAGNETIC-RESONANCE
MIXTURES
ORDER
RAFTS
114 Physical sciences
1182 Biochemistry, cell and molecular biology
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