Abstract

In this work, we monitor the alterations caused in membrane model systems upon the addition of biologically-relevant peptides. Our first study reports on the interaction with model membranes of an internal fusion peptide (SARSIFP) from the S2 subunit of the SARS coronavirus spike glycoprotein. It is believed that SARSIFP might be fundamental for the later steps of the fusion between the viral and host cellular membranes. Non-linear least-squares fits of stearic acid spin labels ESR spectra showed that the rotational dynamics of the HPS headgroup region and of the whole carbon chain of SDS surfactants was perturbed by the peptide.

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