Pulmonary surfactant protein SP-B nanorings induce the multilamellar organization of surfactant complexes

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Martinez Calle, Marta and Prieto, Manuel and Olmedo, Barbara and Fedorov, Aleksander and Loura, Luís M.S. and Pérez-Gil, Jesús (2020) Pulmonary surfactant protein SP-B nanorings induce the multilamellar organization of surfactant complexes. BBA - Biomembranes, 1862 (183216). pp. 1-11. ISSN 0005-2736

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Official URL: https://www-sciencedirect-com.bucm.idm.oclc.org/science/article/pii/S0005273620300420



Abstract

Surfactant protein SP-B is absolutely required for the generation of functional pulmonary surfactant, a unique network of multilayered membranes, which stabilizes the respiratory air-liquid interface. It has been proposed that SP-B assembles into hydrophobic rings and tubes that facilitate the rapid transfer of phospholipids from membrane stores into the interface and the formation of multilayered films, ensuring the stability of the alveoli against physical forces leading to their collapse. To elucidate the molecular organization of SP-B-promoted multilamellar membrane structures, time-resolved Förster Resonance Energy Transfer (FRET) experiments between BODIPY-PC or BODIPY-derivatized SP-B (BODIPY/SP-B), as donor probes, and octadecylrhodamine B, as acceptor probe, were performed in liposomes containing SP-B or BODIPY/SP-B. Our results show that both SP-B and fluorescently labeled SP-B oligomers mediate the connection of adjacent bilayers. Furthermore, by applying rational models to the FRET data, we have been able to provide quantitative details of the structure of SP-Binduced multilayered membrane arrays at the nanometer scale, defining interactions between SP-B rings as key elements for connecting surfactant membranes. The data sustain the structural model and the mechanism of action of SP-B assemblies to sustain the crucial surfactant function.


Item Type:Article
Uncontrolled Keywords:Lung surfactant; Membrane protein; Protein complex; Phospholipid bilayer; Membrane aggregates; FRET
Subjects:Medical sciences > Biology > Biochemistry
ID Code:59463
Deposited On:02 Apr 2020 09:06
Last Modified:31 May 2021 10:23

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