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. Author manuscript; available in PMC: 2008 Aug 18.
Published in final edited form as: Biochemistry. 2006 Jun 27;45(25):7844–7853. doi: 10.1021/bi0526074

Figure 2.

Figure 2

Close-up view of tryptophan-mediated spectral perturbations. Two adjacent subunits in the undecamer are shown in grey and their tryptophan ligands are drawn as CPK. For the middle protomer the same color scheme is used as in Figure 1. Small spheres identify residues whose backbone amide hydrogens exhibited no measurable exchange with deuterium (H/D exchange) in either apo- or holo-TRAP, while the large spheres identify residues whose H/D exchange rate was reduced upon tryptophan binding.