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Vpu spin labeling and CW EPR results. (A) Shown are two NMR structures of the soluble C-terminal domain of the Vpu protein with the residues mutated to cysteines and spin-labeled. The residue Q36C is located at the beginning of amphipathic Helix 2, residue N55C is in highly dynamic loop connecting Helices 2 and 3. (B) EPR spectra of spin-labeled residues Q36C and N55C show very different mobility of spin labels at these sites.
