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. 2010 Dec;136(6):645–657. doi: 10.1085/jgp.201010503

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© 2010 Pantazis et al.

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Figure 6. — A tryptophan derivative can quench TMRM in solution. (A) Molecular structure of NATA, an uncharged l-tryptophan derivative that resembles the structure of nonterminal Trp in proteins. (B) The molecular structure of l-tryptophan. (C) Fluorescence spectra of 1 µM TMRM in external solution under increasing [NATA]. (D) Stern-Volmer plot of peak TMRM fluorescence (573 nm) quenched by NATA. The Stern-Volmer constant (K_SV) is 41.3 M⁻¹.