title: Acridine yellow. A novel use to estimate and measure the plasma membrane potential in Saccharomyces cerevisiae.
abstract: Translocation of ions and other molecules across the plasma membrane of yeast requires the electric potential generated by a H+-ATPase. We measured under different conditions fluorescence changes and accumulation of acridine yellow, looking for qualitative and quantitative estimations of the PMP in Saccharomyces cerevisiae in various conditions. Fluorescence changes indicated an accumulation of the dye requiring a substrate, and accumulation and quenching by mitochondria that could be released by an uncoupler. K+produced a decrease of the fluorescence that was much lower upon the addition of Na+. These changes were confirmed by images of the cells under the microscope. The dye accumulation under different conditions showed changes consistent with the physiological situation of the cells. Since it accumulates due to the PMP, but a large part of it binds to the internal components, we permeabilized the cells with chitosan to subtract this factor and correct the accumulation data. Both raw and corrected values of PMP are different to those obtained before by other authors and our group, showing acridine yellow as a promising indicator to follow changes of the PMP by the fluorescence changes, but also by its accumulation. Under conditions described, the dye is a low cost monitor to define and follow qualitative and quantitative changes of PMP in yeast. Acridine yellow can also be used to follow changes of the mitochondrial membrane potential.
authors.affiliation: Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510, Mexico City, DF, Mexico. mcalahor@ifc.unam.mx.
authors.forename: Martha
authors.identifier: http://orcid.org/0000-0001-6784-3916
authors.initials: M
authors.lastname: Calahorra
authors.affiliation: Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510, Mexico City, DF, Mexico.
authors.forename: Norma Silvia
authors.initials: NS
authors.lastname: Sánchez
authors.affiliation: Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510, Mexico City, DF, Mexico.
authors.forename: Antonio
authors.initials: A
authors.lastname: Peña
mesh_terms: D000609:Aminoacridines / Q000032:analysis*; D002462:Cell Membrane / Q000502:physiology*; D053078:Membrane Potential, Mitochondrial; D008564:Membrane Potentials; D008722:Methods; D008856:Microscopy, Fluorescence / Q000379:methods; D012441:Saccharomyces cerevisiae / Q000166:cytology
chemical_list: D000609:Aminoacridines; C025902:acridine yellow
keywords: Acridine yellow; Organic cations; Plasma membrane potential; Yeast