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

0523856 - ÚOCHB 2021 RIV GB eng J - Journal Article
Liekkinen, J. - Enkavi, G. - Javanainen, Matti - Olmeda, B. - Pérez-Gil, J. - Vattulainen, I.
Pulmonary Surfactant Lipid Reorganization Induced by the Adsorption of the Oligomeric Surfactant Protein B Complex.
Journal of Molecular Biology. Roč. 432, č. 10 (2020), s. 3251-3268. ISSN 0022-2836. E-ISSN 1089-8638
Institutional support: RVO:61388963
Keywords : pulmonary surfactant * protein–lipid interactions * SP-B * molecular dynamics simulation
OECD category: Physical chemistry
Impact factor: 5.469, year: 2020
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S0022283620302059

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.
Permanent Link: http://hdl.handle.net/11104/0308133