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. 2019 May 24;12:133. doi: 10.3389/fnmol.2019.00133

Figure 9.

Figure 9

Conserved ΔF signal patterns in voltage-clamp fluorometry (VCF) experiments. All experiments of this figure are from hASIC1a expressed in Xenopus oocytes, voltage-clamped to −40 mV. (A–C) Different views of the structural model of hASIC1a described in legend of Figure 7, showing in (B) a close-up of the acidic pocket, in (C) a close-up of the wrist, indicating the positions of the residues that were mutated to Cys to attach the fluorophore. (D) Representative current (black) and fluorescence (red) traces of Cys and Cys-Trp mutants in the hASIC1a-D212 background. (E) Traces of the corresponding Cys and Cys-Trp mutants in the background of hASIC1a-G212. (D,E) Fluorophore-labeled oocytes were exposed to the stimulation pH6.0 from a conditioning pH7.4. Black arrows point to fast ΔF components. (F,G) Scatter dot plots comparing the fluorescence rise time (red) with the current rise time (F) or decay time (G) in response to an acidic stimulation at pH6.0 from a conditioning pH7.4, n = 4–9.