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  Hydration Layer of Only a Few Molecules Controls Lipid Mobility in Biomimetic Membranes

Chattopadhyay, M., Krok, E., Orlikowska, H., Schwille, P., Franquelim, H. G., & Piatkowski, L. (2021). Hydration Layer of Only a Few Molecules Controls Lipid Mobility in Biomimetic Membranes. Journal of the American Chemical Society, 143(36), 14551-14562. doi:10.1021/jacs.1c04314.

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Genre: Journal Article

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 Creators:
Chattopadhyay, Madhurima1, Author
Krok, Emilia1, Author
Orlikowska, Hanna1, Author
Schwille, Petra2, Author              
Franquelim, Henri G.2, Author              
Piatkowski, Lukasz1, Author
Affiliations:
1external, ou_persistent22              
2Schwille, Petra / Cellular and Molecular Biophysics, Max Planck Institute of Biochemistry, Max Planck Society, ou_1565169              

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Free keywords: PHOSPHOLIPID-MEMBRANES; LATERAL DIFFUSION; WATER; BILAYERS; DYNAMICS; MODEL; TREHALOSE; FLUID; ANHYDROBIOSIS; MONOLAYERSChemistry;
 Abstract: Self-assembly of biomembranes results from the intricate interactions between water and the lipids' hydrophilic head groups. Therefore, the lipid-water interplay strongly contributes to modulating membrane architecture, lipid diffusion, and chemical activity. Here, we introduce a new method of obtaining dehydrated, phase-separated, supported lipid bilayers (SLBs) solely by controlling the decrease of their environment's relative humidity. This facilitates the study of the structure and dynamics of SLBs over a wide range of hydration states. We show that the lipid domain structure of phase-separated SLBs is largely insensitive to the presence of the hydration layer. In stark contrast, lipid mobility is drastically affected by dehydration, showing a 6-fold decrease in lateral diffusion. At the same time, the diffusion activation energy increases approximately 2-fold for the dehydrated membrane. The obtained results, correlated with the hydration structure of a lipid molecule, revealed that about six to seven water molecules directly hydrating the phosphocholine moiety play a pivotal role in modulating lipid diffusion. These findings could provide deeper insights into the fundamental reactions where local dehydration occurs, for instance during cell-cell fusion, and help us better understand the survivability of anhydrobiotic organisms. Finally, the strong dependence of lipid mobility on the number of hydrating water molecules opens up an application potential for SLBs as very precise, nanoscale hydration sensors.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published in print
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000697286000020
DOI: 10.1021/jacs.1c04314
 Degree: -

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Title: Journal of the American Chemical Society
Source Genre: Journal
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Publ. Info: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA : AMER CHEMICAL SOC
Pages: - Volume / Issue: 143 (36) Sequence Number: - Start / End Page: 14551 - 14562 Identifier: ISSN: 0002-7863