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FEMS Yeast Res. 2018 May 1;18(3). doi: 10.1093/femsyr/foy030.

Effect of GAPDH-derived antimicrobial peptides on sensitive yeasts cells: membrane permeability, intracellular pH and H+-influx/-efflux rates.

Author information

1
LEAF, Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
2
Unit of Bioenergy, Laboratório Nacional de Energia e Geologia (LNEG), Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal.
3
Department of Food Science, Faculty of Sciences, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark.
4
DRAT, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal.

Abstract

Saccharomyces cerevisiae secretes antimicrobial peptides (AMPs) derived from glyceraldehyde-3-phosphate dehydrogenase (GAPDH), which induce the death of several non-Saccharomyces yeasts. Previously, we demonstrated that the naturally secreted GAPDH-derived AMPs (i.e. saccharomycin) caused a loss of culturability and decreased the intracellular pH (pHi) of Hanseniaspora guilliermondii cells. In this study, we show that chemically synthesised analogues of saccharomycin also induce a pHi drop and loss of culturability in H. guilliermondii, although to a lesser extent than saccharomycin. To assess the underlying causes of the pHi drop, we evaluated the membrane permeability to H+ cations of H. guilliermondii cells, after being exposed to saccharomycin or its synthetic analogues. Results showed that the H+-efflux decreased by 75.6% and the H+-influx increased by 66.5% in cells exposed to saccharomycin at pH 3.5. Since H+-efflux via H+-ATPase is energy dependent, reduced glucose consumption would decrease ATP production and consequently H+-ATPase activity. However, glucose uptake rates were not affected, suggesting that the AMPs rather than affecting glucose transporters may affect directly the plasma membrane H+-ATPase or increase ATP leakage due to cell membrane disturbance. Thus, our study revealed that both saccharomycin and its synthetic analogues induced cell death of H. guilliermondii by increasing the proton influx and inhibiting the proton efflux.

PMID:
29546274
DOI:
10.1093/femsyr/foy030
[Indexed for MEDLINE]

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