Pulmonary Surfactant Lipid Reorganization Induced by the Adsorption of the Oligomeric Surfactant Protein B Complex

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Liekkinen , J , Enkavi , G , Javanainen , M , Olmeda , B , Pérez-Gil , J & Vattulainen , I 2020 , ' Pulmonary Surfactant Lipid Reorganization Induced by the Adsorption of the Oligomeric Surfactant Protein B Complex ' , Journal of Molecular Biology , vol. 432 , no. 10 , pp. 3251-3268 . https://doi.org/10.1016/j.jmb.2020.02.028

Title: Pulmonary Surfactant Lipid Reorganization Induced by the Adsorption of the Oligomeric Surfactant Protein B Complex
Author: Liekkinen, Juho; Enkavi, Giray; Javanainen, Matti; Olmeda, Barbara; Pérez-Gil, Jesús; Vattulainen, Ilpo
Contributor: University of Helsinki, Materials Physics
University of Helsinki, Materials Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2020-05-01
Language: eng
Number of pages: 18
Belongs to series: Journal of Molecular Biology
ISSN: 0022-2836
URI: http://hdl.handle.net/10138/315444
Abstract: Surfactant protein B (SP-B) is essential in transferring surface-active phospholipids from membrane-based surfactant complexes into the alveolar air-liquid interface. This allows maintaining the mechanical stability of the surfactant film under high pressure at the end of expiration, therefore SP-B is crucial in lung function. Despite its necessity, the structure and the mechanism of lipid transfer by SP-B have remained poorly characterized. Earlier, we proposed higher order oligomerization of SP-B into ring-like supramolecular assemblies. In the present work, we used coarse-grained molecular dynamics simulations to elucidate how the ring-like oligomeric structure of SP-B determines its membrane binding and lipid transfer. In particular, we explored how SP-B interacts with specific surfactant lipids, and how consequently SP-B reorganizes its lipid environment to modulate the pulmonary surfactant structure and function. Based on these studies, there are specific lipid-protein interactions leading to perturbation and reorganization of pulmonary surfactant layers. Especially, we found compelling evidence that anionic phospholipids and cholesterol are needed or even crucial in the membrane binding and lipid transfer function of SP-B. Also, on the basis of the simulations, larger oligomers of SP-B catalyze lipid transfer between adjacent surfactant layers. Better understanding of the molecular mechanism of SP-B will help in the design of therapeutic SP-B-based preparations and novel treatments for fatal respiratory complications, such as the acute respiratory distress syndrome.
Subject: Pulmonary surfactant
Protein-lipid interactions
SP-B
Molecular dynamics simulation
114 Physical sciences
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