The transmembrane domain of the SNARE protein VAMP2 is highly sensitive to its lipid environment
Language
EN
Article de revue
This item was published in
Biochimica et Biophysica Acta:Biomembranes. 2019, vol. 1861, n° 3, p. 670-676
English Abstract
Neurotransmitter and hormone exocytosis depends on SNARE protein transmembrane domains and membrane lipids but their interplay is poorly understood. We investigated the interaction of the structure of VAMP2, a vesicular ...Read more >
Neurotransmitter and hormone exocytosis depends on SNARE protein transmembrane domains and membrane lipids but their interplay is poorly understood. We investigated the interaction of the structure of VAMP2, a vesicular transmembrane SNARE protein, and membrane lipid composition by infrared spectroscopy using either the wild-type transmembrane domain (TMD), VAMP2TM22, or a peptide mutated at the central residues G100/C103 (VAMP2TM22VV) previously identified by us as being critical for exocytosis. Our data show that the structure of VAMP2TM22, in terms of alpha-helices and beta-sheets is strongly influenced by peptide/lipid ratios, by lipid species including cholesterol and by membrane surface charges. Differences observed in acyl chain alignments further underscore the role of the two central small amino acid residues G100/C103 within the transmembrane domain during lipid rearrangements in membrane fusion. Copyright © 2018 Elsevier B.V. All rights reserved.Read less <
English Keywords
ATR-infrared spectroscopy
Synaptobrevin
Exocytosis
SNARE proteins
Cholesterol
Phospholipid
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