GXXXG-Mediated Parallel and Antiparallel Dimerization of Transmembrane Helices and Its Inhibition by Cholesterol: Single-Pair FRET and 2D IR Studies

TitleGXXXG-Mediated Parallel and Antiparallel Dimerization of Transmembrane Helices and Its Inhibition by Cholesterol: Single-Pair FRET and 2D IR Studies
Publication TypeJournal Article
Year of Publication2017
AuthorsYano Y, Kondo K, Watanabe Y, Zhang TO, Ho J-J, Oishi S, Fujii N, Zanni M T., Matsuzaki K
Secondary TitleAngewandte
Date Published01/2017
PublisherAngewandte
Abstract

Small-residue-mediated interhelical packings are ubiquitously found in helical membrane proteins, although their interaction dynamics and lipid dependence remain mostly uncharacterized. We used a single-pair FRET technique to examine the effect of a GXXXG motif on the association of de novo designed (AALALAA)3 helices in liposomes. Dimerization occurred with sub-second lifetimes, which was abolished by cholesterol. Utilizing the nearly instantaneous time-resolution of 2D IR spectroscopy, parallel and antiparallel helix associations were identified by vibrational couplings across helices at their interface. Taken together, the data illustrate that the GXXXG motif controls helix packing but still allows for a dynamic and lipid-regulated oligomeric state.

URLhttp://onlinelibrary.wiley.com/doi/10.1002/ange.201609708/full
DOI10.1002/ange.201609708