Both single and multicellular organisms depend on anti-stress mechanisms that enable them to deal with sudden changes in the environment, including exposure to heat and oxidants. Central to the stress response are dynamic changes in metabolism, such as the transition from the glycolysis to the pentose phosphate pathway—a conserved first-line response to oxidative insults1,2. Here we report a second metabolic adaptation that protects microbial cells in stress situations. The role of the yeast polyamine transporter Tpo1p3,4,5 in maintaining oxidant resistance is unknown6. However, a proteomic time-course experiment suggests a link to lysine metabolism. We reveal a connection between polyamine and lysine metabolism during stress situations, in the form of a promiscuous enzymatic reaction in which the first enzyme of the polyamine pathway, Spe1p, decarboxylates lysine and forms an alternative polyamine, cadaverine. The reaction proceeds in the presence of extracellular lysine, which is taken up by cells to reach concentrations up to one hundred times higher than those required for growth. Such extensive harvest is not observed for the other amino acids, is dependent on the polyamine pathway and triggers a reprogramming of redox metabolism. As a result, NADPH—which would otherwise be required for lysine biosynthesis—is channelled into glutathione metabolism, leading to a large increase in glutathione concentrations, lower levels of reactive oxygen species and increased oxidant tolerance. Our results show that nutrient uptake occurs not only to enable cell growth, but when the nutrient availability is favourable it also enables cells to reconfigure their metabolism to preventatively mount stress protection.
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Proteomic data are accessible through ProteomeXchange (PXD013373). The kinetic data is available in Table 1, and the raw data used to generate the figures is provided in the Supplementary Tables.
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This work was supported by the Francis Crick Institute which receives its core funding from Cancer Research UK (FC001134), the UK Medical Research Council (FC001134) and the Wellcome Trust (FC001134), as well as specific project funding from the Wellcome Trust (IA 200829/Z/16/Z to M.R.) and the ERC (StG260809 to M.R.). V. O.-S. was funded by the Consejo Nacional de Ciencia y Tecnología Mexico (postdoctoral fellowship 232510.), M.T.A. by the Warwick Medical School and D.A.P.N. by the Austrian Science Fund (Doctoral Program Biomolecular Technology of Proteins, FWF W1224). We thank A. Flint, H. Lee and D. Panneman for help with experiments; and A. Carter and E. Morales-Rios (MRC-LMB, Cambridge), M. K. Jensen (DTU), N. Typas and A. Koumoutsi (EMBL Heidelberg), G. Liti (University of Nice) and J. Hallin (Universite Laval) for providing strains, plasmids and enabling us to access their facilities.
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Nature thanks Kazuei Igarashi, Jens Nielsen and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Extended data figures and tables
A proteomic time-course experiment recorded by SWATH-MS6 was re-analysed with a new spectral library and a recent version of Spectronaut (Biognosys) software, increasing the depth of the proteomic analysis. a, Principal component analysis shows that proteome profiles of H2O2-exposed Δtpo1 yeast6 are more different from the wild type than that of a Tpo1p-overexpressing strain and that there is a metabolic adaptation in the lysine pathway. Numbers indicate time points (in minutes) after the oxidative insult. b, Gene Ontology (GO) enrichment analysis shows that a number of biosynthetic processes are significantly enriched in proteins differentially expressed between wild-type and Δtpo1 yeast upon exposure to H2O2. Most of the GO terms that are significantly enriched belong to processes that are typically seen to be activated upon treatment with H2O2, including oxidation–reduction processes, cell cycle, nucleotide synthesis and ribosome43. Metabolic processes affected include carbohydrate- and amino acid metabolism, including two GO terms specific for the lysine pathway. Significance of enrichment over base frequency was calculated using a binomial test44, and P values (red line) were corrected for false discovery rate using Bonferroni (blue) or Benjamini–Hochberg (green) correction. n = 5.
Lys20p/Lys21p, homocitrate synthase; Aco2p, aconitase; Lys4p, homoaconitase; Lys12p, homoisocitrate dehydrogenase; Aro8p, 2-aminoadipate transaminase; Lys2p, α-aminoadipate reductase; Lys9p, saccharopine dehydrogenase (NADP+ and l-glutamate-forming); Lys1p, saccharopine dehydrogenase (NAD+ and l-lysine-forming).
Extended Data Fig. 3 Effect of lysine supplementation on the intracellular concentration of the canonical polyamines and growth.
a, Polyamine content in yeast cells in the mid-log phase grown in SM media with and without 25 μg ml−1 lysine, as quantified by LC–MS/MS using selected reaction monitoring. Bar charts represent the mean ± s.d.; n = 3 biologically independent samples for non-supplemented conditions and n = 4 for supplemented conditions. Unpaired two-tailed Student’s t-test, wild-type cells supplemented versus non-supplemented with lysine: ****P ≤ 0.0001, **P = 0.0066. b, Growth curves of wild-type cells grown in SM media with or without lysine (25 μg ml−1) supplementation. The data represent mean ± s.d.; n = 3 biologically independent samples. Source data
Extended Data Fig. 4 Predictions of the growth-optimized (naive) model for flux balance analysis of lysine harvesting.
We used a revised version of the S. cerevisiae genome-scale metabolic model (iMM904_NADcorrected22). Six additional reactions related to cadaverine biosynthesis were added: two metabolic reactions for ornithine decarboxylase (H + lys_L → CO2 + cadaverine) and spermine synthase (S-adenosyl 3-(methylthio)propylamine + cadaverine → S-methyl-5′-thioadenosine + aminopropyl-cadaverine), and four reactions for transporting and exchanging cadaverine and aminopropylcadaverine. In silico synthetic minimal media constraints were used according to the original model (iMM90441). For excess lysine uptake, the constraint of the l-lysine exchange reaction was fixed to a value of 1. Model simulation (FBA) was performed using the COBRA toolbox for maximum growth in both media conditions.
Extended Data Fig. 5 Lysine and methionine supplementation have no growth-relevant effect on the oxidative capacity of media containing H2O2.
a, H2O2 levels measured by Amplex Red fluorescence in water (left) or SM medium (right) supplemented with l-lysine (25 μg ml−1), d-lysine (25 μg ml−1) or l-methionine (40 μg ml−1) with or without 30 min pre-incubation with 2.5 mM H2O2. The data represent mean ± s.d.; n = 3 independent experiments. b, Growth curves of cells pre-cultured in SM, SM + lysine (SM + Lys, 25 μg ml−1) or SM + methionine (SM + Met, 40 μg ml−1). At mid-log phase (OD600nm ≈ 0.5) cells were pre-incubated for 0 or 30 min with 2.5 mM of H2O2 in the respective pre-culture medium. The data represent mean ± s.d.; n = 3 biologically independent samples. Source data
Extended Data Fig. 6 Effect of lysine supplementation on mammalian cell lines that are auxotrophic for lysine.
a, Growth curves showing the effect of different concentrations of lysine (0.01–10 mM) on mammalian cell growth. Percentage confluence was calculated using the IncuCyte imaging system (Essen Bioscience). The data represent mean ± s.d.; n = 3 biologically independent samples. b, Intracellular lysine concentrations in different mammalian cell lines grown in DMEM with a range of concentrations of lysine (0.01–10 mM). Cells were seeded at 0.5 × 106 cells per 6-cm plate and grown for 48 h before collection. The data represent mean ± s.d.; n = 3 biologically independent samples. Source data
Extended Data Fig. 7 Lysine harvesting protects against H2O2 in different yeast and bacteria species.
a, Effect of the supplementation of lysine on the resistance of mammalian cells to H2O2. Cell biomass was quantified by crystal-violet staining following 24 h treatment with H2O2 at a range of concentrations in cultures supplemented with 0.1–10 mM lysine. The data represent mean ± s.d.; n = 3 biologically independent samples. b, Growth curves of C. tropicalis, the S. cerevisiae laboratory strain BY4741 with repaired auxotrophic loci and two non-laboratory isolates of S. cerevisiae in SM media with or without 25 μg ml−1 lysine. When challenged with 1.5 mM H2O2, cultures supplemented with lysine (pre-cultures were also supplemented) can survive and eventually grow (red versus green curves). c, Spot test of the resistance of P. pastoris to H2O2. Overnight cultures were grown in SM media (potassium phosphate-buffered, pH 6.0) with or without lysine (76 mg l−1) supplementation and were diluted to OD600nm = 1 in water, serial diluted and spotted onto SM media (potassium phosphate-buffered, pH 6.0) with or without lysine supplementation and H2O2. The experiment was repeated with similar results. d, Growth curves of B. subtilis 168 trpC2 when challenged with 1.5 mM H2O2 versus a water control, at mid-log phase in S7 minimal media with or without lysine (40 µg ml−1) supplementation. Source data
Extended Data Fig. 8 Yeast can accumulate high levels of cadaverine and aminopropylcadaverine that are not toxic.
a, b, Cadaverine (a) and aminopropylcadaverine (APC) (b) concentrations in S. cerevisiae wild-type strain overexpressing E. coli LdcC (WT LDC) or carrying the empty plasmid (WT pYX212). Polyamines were derivatized with dansyl chloride and quantified by LC–MS/MS. The data represent mean ± s.d.; n = 3 biologically independent samples. Unpaired two-tailed Student’s t-test: wild-type pYX212 versus WT LDC in non-supplemented conditions ***P = 0.0003 and supplemented conditions ***P = 0.0007 for a; and **P = 0.0054 and ***P = 0.0007 for non-supplemented and supplemented conditions for b. c, Growth curves showing the effect of lysine (250 µg ml−1) on growth when the wild-type strain is overexpressing E. coli LdcC. The data represent mean ± s.d.; n = 3 biologically independent samples. Source data
Extended Data Fig. 9 Cadaverine can partially substitute for canonical polyamines, but only at non-physiologically high concentrations and at a certain pH, and does not protect S. cerevisiae against H2O2 stress.
a, b, Growth curves of Δspe1 strain depleted from spermidine grown in SM media alone or supplemented with 250 mM cadaverine in the absence (a) or presence (b) of 0.1 mM spermidine. The data represent mean ± s.d.; n = 3 biologically independent samples. c, Growth curves showing the effect of lysine supplementation on wild-type and Δspe1 strains carrying a control plasmid (empty) or overexpressing E. coli LdcC (LDC), when grown in SM media buffered or not buffered at pH 5.0. The data represent mean ± s.d.; n = 4 biologically independent samples per experiment. The experiment was repeated twice. d, H2O2 tolerances were determined as described above, but substituting lysine with 5 mM cadaverine. The data represent mean ± s.d.; n = 4 independent experiments. Even in the presence of this high level of cadaverine, the yeast cells do not tolerate higher levels of H2O2. Source data