Measuring Transmembrane Helix Interaction Strengths in Lipid Bilayers Using Steric Trapping
We have developed a method to measure strong transmembrane (TM) helix interaction affinities in lipid bilayers that are difficult to measure by traditional dilution methods. The method, called steric trapping, couples dissociation of biotinylated TM helices to a competitive binding by monovalent streptavidin (mSA), so that dissociation is driven by the affinity of mSA for biotin and mSA concentration. By adjusting the binding affinity of mSA through mutation, the method can obtain dissociation constants of TM helix dimers (K d,dimer) over a range of six orders of magnitudes. The K d,dimer limit of measurable target interaction is extended 3–4 orders of magnitude lower than possible by dilution methods. Thus, steric trapping opens up new opportunities to study the folding and assembly of α-helical membrane proteins in lipid bilayer environments. Here we provide detailed methods for applying steric trapping to a TM helix dimer.
Key wordsMembrane protein folding Steric trap Glycophorin A dimer Transmembrane helix interaction Monovalent streptavidin Biotinylation
We thank the Karen Fleming lab (Johns Hopkins University) and the Alice Ting lab (MIT) for providing plasmids. This work was supported by National Institutes of Health (NIH) Grants R01GM063919 and R01GM081783 (to J.U.B.) and start-up funds from Michigan State University (to H.H.). H.H. was supported by the Leukemia and Lymphoma Society Career Development Program (Fellow).