Figure 10. Under CR conditions in the presence of LCA, lack of the Fzo1, Mgm1 or Ugo1 protein component of the mitochondrial fusion machine decreases the efficiency of yeast CLS extension by LCA.

WT cells and mutant cells carrying a single-gene-deletion mutation eliminating either the Fzo1, Mgm1 or Ugo1 protein were cultured in the nutrient-rich YP medium initially containing 0.2% glucose with 50 μM LCA or without it. (A, B, C) Survival curves of the chronologically aging WT and fzo1Δ (A), WT and mgm1Δ (B) or WT and ugo1Δ (C) strains are shown. Data are presented as means ± SEM (n = 3). Data for the WT strain cultured with or without LCA are replicated in graphs A, B, C of this Figure. (D, E, F) p Values for different pairs of survival curves of the WT and fzo1Δ (D), WT and mgm1Δ (E) or WT and ugo1Δ (F) strains cultured with or without LCA. Survival curves shown in (A, B or C, respectively) were compared. Two survival curves were considered statistically different if the p value was less than 0.05. The p values for comparing pairs of survival curves using the logrank test were calculated as described in Materials and Methods. The p values displayed on a yellow color background indicate that LCA extends the CLS of the WT, fzo1Δ (D), mgm1Δ (E) and ugo1Δ (F) strains. The p values displayed on a blue color background in D, E and F indicate that LCA extends the CLS of the fzo1Δ (D), mgm1Δ (E) and ugo1Δ (F) strains to a lower extent than that of the WT strain. (G, H) Survival curves shown in (A, B, C) were used to calculate the fold of increase of the mean (G) and maximum (H) CLS by LCA for the WT, fzo1Δ, mgm1Δ and ugo1Δ strains. Data are presented as means ± SEM (n = 3; ^*p < 0.05). Abbreviations: L, D, PD and ST, logarithmic, diauxic, post-diauxic and stationary growth phases (respectively).