Abstract
Temperature is a key determinant of microbial behaviour and survival in the environment and within hosts. At intermediate temperatures, growth rate varies according to the Arrhenius law of thermodynamics, which describes the effect of temperature on the rate of a chemical reaction. However, the mechanistic basis for this behaviour remains unclear. Here we use single-cell microscopy to show that Escherichia coli exhibits a gradual response to temperature upshifts with a timescale of ~1.5 doublings at the higher temperature. The response was largely independent of initial or final temperature and nutrient source. Proteomic and genomic approaches demonstrated that adaptation to temperature is independent of transcriptional, translational or membrane fluidity changes. Instead, an autocatalytic enzyme network model incorporating temperature-sensitive Michaelis–Menten kinetics recapitulates all temperature-shift dynamics through metabolome rearrangement, resulting in a transient temperature memory. The model successfully predicts alterations in the temperature response across nutrient conditions, diverse E. coli strains from hosts with different body temperatures, soil-dwelling Bacillus subtilis and fission yeast. In sum, our model provides a mechanistic framework for Arrhenius-dependent growth.
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Data availability
Imaging datasets used to generate growth rate analyses are available from the corresponding author upon request. Processed and analysed imaging data sets of growth trajectories and FRAP measurements, liquid growth measurements, processed transposon sequencing and processed proteomics data are all available at the Harvard Dataverse72. Raw transposon sequencing data have been deposited in NCBI’s Sequence Read Archive (SRA) under project accession identifier PRJNA1138713. Mass spectrometry proteomics data have been deposited in the ProteomeXchange Consortium via the PRIDE73 partner repository with data set identifier PXD048941.
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Acknowledgements
We thank members of the Huang lab for helpful discussions. The E. coli BW25113 transposon mutant library was provided by the Deutschbauer lab (Lawrence Berkeley National Laboratory), with help from V. Trotter. This work was funded by a Stanford Interdisciplinary Graduate Fellowship (to B.D.K.), NIH RM1 GM135102 (to K.C.H.) and NSF Awards EF-2125383 and IOS-2032985 (to K.C.H.). K.C.H. is a Chan Zuckerberg Biohub Investigator.
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B.D.K. and K.C.H. conceived the study and designed the experiments. B.D.K. and C.G. performed experimental bench work. H.V., J.J.T. and H.S. helped design temperature-control devices. B.D.K., M.T. and K.C.H. analysed the data. B.D.K., L.W. and K.C.H. developed the TSEN model. J.R. contributed strains. H.S., J.E.E. and K.C.H. supervised the research. B.D.K. and K.C.H. wrote the manuscript with input from all authors.
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Extended data
Extended Data Fig. 1 E. coli exhibits robust Arrhenius behavior with a highly conserved activation energy.
a) Liquid-culture maximal growth rates across temperatures of diverse E. coli strains from various animal hosts (Methods). Each strain is labeled with its laboratory accession number (Supplementary Table 1), host source, and estimated host body temperature. Each data point represents the mean of eight biological replicates, with error bars representing the standard deviation. b) Arrhenius plots of growth rates from (a). The natural logarithm of maximal growth rate is plotted against the inverse absolute temperature for temperatures between 27 °C and 37 °C, along with weighted linear fits for each strain. c) Activation energies measured as the slope of the linear fit to the data in (b) for each E. coli strain, with errors reported as the standard error of the mean (SEM) from the weighted fit. Each strain is grouped according to host body temperature (blue: Ectothermic, green: Mammalian, red: Avian, gray: Laboratory (MG1655, BW25113)). Each bar represents the mean of eight biological replicates. d) Steady-state maximum growth rates in rich medium (LB) of E. coli BW25113, CS109, and BL21 between 18 °C and 47 °C (Methods). Each maximal growth rate is reported as the mean±1 standard deviation of eight biological replicates. e) Arrhenius plot of growth rates from (d). The natural logarithm of maximal growth rate is plotted against the inverse absolute temperature. Growth rates measured at temperatures between 25 °C and 37 °C were used for measuring the activation energy (slope, Ea).
Extended Data Fig. 2 Temperature upshifts to mild heat-shock temperatures are characterized by slower final growth rates but similar normalized response times.
a) Single-cell growth rates of E. coli MG1655 on rich medium (LB) undergoing temperature upshifts from 27 °C to 37 °C (blue, n=792 cells), 40 °C (purple, n=278 cells), or 42 °C (red, n=474 cells). Data are the mean±1 SEM (shaded region) at each time point. b) Normalized growth rate versus thermal time follows a common trajectory for each upshift in (a).
Extended Data Fig. 3 Effect of chaperones, oxygen, and the stringent response on temperature upshift responses.
a) Single-cell growth rates of E. coli MG1655 on rich medium (LB) undergoing a temperature upshift from 25 °C to 37 °C in aerobic (blue, n=773 cells) or anaerobic (orange, n=319 cells) conditions. Data are the mean±1 SEM (shaded region) at each time point. b) Normalized growth rate versus thermal time for each trajectory in (a). c) Single-cell growth rates of ΔdnaK (red, n=433 cells) and its parent BW25113 (blue, n=1011 cells) on rich medium (LB) undergoing a temperature upshift from 37 °C to 42 °C. Data are the mean±1 SEM (shaded region) at each time point. d) Single-cell growth rates of ΔdnaK (red, n=318 cells) and its parent BW25113 (blue, n=734 cells) on rich medium (LB) undergoing a temperature upshift from 27 °C to 37 °C. Data are the mean±1 SEM (shaded region) at each time point. e) Normalized growth rate versus thermal time for each trajectory in (d). f) Single-cell growth rates of a ppGppnull strain (ΔrelA ΔspoT) (purple, n=648 cells) and its parent MG1655 (blue, n=792 cells) on rich medium (LB) undergoing a temperature upshift from 27 °C to 37 °C. Data are the mean±1 SEM (shaded region) at each time point. g) Normalized growth rate versus thermal time for each trajectory in (f). h) Single-cell growth rates of ppGppnull (purple, n=47 cells) and its parent MG1655 (blue, n=474 cells) on rich medium (LB) undergoing a temperature upshift from 27 °C to 42 °C. Data are the mean±1 SEM (shaded region) at each time point.
Extended Data Fig. 4 Downshift pulses reveal temperature history.
a) Single-cell growth rates of E. coli MG1655 on rich medium (LB) starting at 37 °C subjected to 27 °C pulses for 2 min (red, n=519 cells), 5 min (purple, n=397 cells), 12 min (green, n=451 cells), or 17 min (dark red, n=422 cells). Dotted lines represent the time at which cells were subjected to a 27 °C downshift. The shift from steady-state growth at 27 °C to 37 °C is also shown for comparison (blue, n=773 cells). Data are the mean±1 SEM (shaded region). b) Single-cell growth rates of E. coli MG1655 on rich medium (LB) starting at 37 °C subjected to a 23 °C pulse for 5 min before an upshift to the intermediate temperature 30 °C (red, n=330 cells). The vertical dashed line indicates the start of cooling, which required ~2 min to reach 23 °C. The shift from steady-state growth at 23 °C to 30 °C is also shown for comparison (blue, n=396 cells).
Extended Data Fig. 5 E. coli growth rate responds rapidly to heat-shock and cold-shock pulses.
a) Single-cell growth rates of E. coli MG1655 on rich medium (LB) undergoing temperature upshifts from 37 °C to 40 °C (purple, n=479 cells), 42 °C (orange, n=1249 cells), 43 °C (red, n=819 cells), or 47 °C (dark red, n=474 cells). Data are the mean±1 SEM (shaded region) at each time point. b) Single-cell growth rates of E. coli MG1655 on rich medium (LB) starting at 37 °C and subjected to heat-shock pulses at 47 °C for 5 min (orange, n=381 cells) or 35 min (dark red, n=474 cells). Vertical dashed lines represent the times at which cells were shifted back to 37 °C. Data are the mean±1 SEM (shaded region) at each time point. c) Single-cell growth rates of E. coli MG1655 on rich medium (LB) starting at 37 °C and subjected to ~10-min cold-shock pulses at 18 °C (light blue, n=361 cells) or 12 °C (dark blue, n=390 cells). Data are the mean±1 SEM (shaded region) at each time point. d) Temperature readout of a 5-min pulse at 0 °C (Methods) starting from 37 °C. t=0 is when cells were shifted back to 37 °C. e) Single-cell growth rates of E. coli MG1655 on rich medium (LB) starting at 37 °C and subjected to a 5-min cold-shock pulse at 0 °C (purple, n=283 cells) shown in (d). Horizontal dashed line represents cell shrinkage defined as growth rate <0 h−1. Data are the mean±1 SEM (shaded region) at each time point. f) Images of E. coli MG1655 on rich medium (LB) during a 10-min pulse at 0 °C starting from 37 °C. At 37 °C, cells exhibited normal morphologies and growth (top). At 0 °C, cells shrank, as exemplified by the cell whose length at t=-10 min represented by a double-arrowed line extends beyond the cell boundary at t=0 (middle). Growth resumed quickly after the sample was heated back to 37 °C, without loss in cell viability (bottom).
Extended Data Fig. 6 Changes in membrane fluidity do not alter the response to temperature upshift but increase lysis at high temperatures.
a) FRAP recovery dynamics of the membrane dye MitoTracker in the parent strain BW25113 (blue, n=19 cells), the high-fluidity mutant ΔfabR (red, n=15 cells), and the low-fluidity mutant ΔfadR (purple, n=14 cells) grown on LB (Methods). Curves show the mean recovery and shaded regions represent ±1 SEM. b) Membrane viscosity (Methods) was significantly lower and higher in ΔfabR and ΔfadR, respectively, compared with the parent. Significance was determined using a two-sample t-test (two-sided); *: p=0.013, **: p<1.8×10−8. c) Membrane viscosity of E. coli BW25113 cells after an upshift at t=0 from 27 °C to 37 °C in LB (Methods). Points are estimates from a best fit (Methods) and error bars represent 1 standard error. Dotted line is the mean viscosity from steady-state measurements (b), and the shaded region represents ±1 standard deviation. d) Growth rate responses of E. coli BW25113 (blue, n=686 cells), ΔfabR (red, n=924 cells), and ΔfadR (purple, n=409 cells) to a temperature upshift from 27 °C to 37 °C in LB. Curves show mean growth rate and shaded regions represent ±1 SEM. e) Normalized growth rate followed a similar trajectory versus thermal time among the mutants and parent for the data in (d). f) Growth curves of wild-type (BW25113) (blue) and ΔfabR (red) cells grown in LB at 37 °C (n=3 replicates). Optical density (OD) was corrected for non-linearity at high OD values (Methods). Maximum growth rates are the mean across replicates and the error is ±1 standard deviation. g) Growth rate response to a temperature upshift from 37 °C to 42 °C in E. coli BW25113 (blue, n=1011 cells) and ΔfabR (red, n=554 cells). Both strains exhibited an initial decrease in growth rate followed by recovery to the steady-state growth rate at 37 °C, but recovery was more delayed for the high-fluidity ΔfabR mutant. Curves show mean growth rate and shaded regions represent ±1 SEM. h) (Left) Representative images of ΔfabR cells throughout a temperature upshift from 37 °C to 44 °C. At 37 °C, morphology and growth were wild-type-like (top left). Growth halted immediately after the shift to 44 °C (top right), with loss of turgor and cell death occurring within 30–40 min after the shift (bottom left, right). (Right) Representative images of wild-type MG1655 cells before and after an upshift from 37 °C to 44 °C. Cells maintained growth and shape.
Extended Data Fig. 7 Effects of changes in TSEN model parameters on temperature-shift response dynamics.
a) Increasing the catalytic rate (\({k}_{i}\)) for each reaction in a bottlenecked minimal TSEN model (gray box) from 1 min−1 to 1000 min−1 has virtually no effect on the response. b) Effect of model parameters on the normalized response time to a temperature upshift from 27 °C to 37 °C in the minimal TSEN model (gray box) for each reaction (import, production, growth). The definitions of each parameter are provided in Fig. 4a. All other parameters were set to default values (vertical gray bars) in each simulation. Notably, increases in the activation energy of the \({K}_{M}\) of the production reaction produced the largest increase in response times across all activation energies (right). c) The analytically tractable production-less TSEN model (gray box, Supplementary Text) predicts a non-zero response time. The simulation used default parameters (\({k}_{i}\)= 1 min−1, \({K}_{M}\) = 1 mM, \({E}_{a}^{{cat}}\) = 15 kcal/mol, \({E}_{a}^{M}\)= 15 kcal/mol), with the exception of the Michaelis-Menten constant of the second reaction \({K}_{1}\,\)= 20 mM. d) Normalized response time increases with increased activation energy of \({K}_{1}\) in the production-less TSEN model (gray box). e) Normalized response time increases with increased \({K}_{1}\) in the production-less TSEN model (gray box). f) Normalized response time was between 1 and 2 doublings when the cutoff used to define the adaptation was increased from 95% to 99% of the steady-state growth rate difference in the production-less TSEN model (gray box). g) Arrhenius plot of steady-state growth rate across temperatures predicted by the minimal TSEN model (gray box) exhibits slightly non-linear behavior.
Extended Data Fig. 8 TSEN model is compatible with reversible enzyme kinetics and predicts nutrient perturbation responses.
a) Predictions of the minimal TSEN (3 total reactions, single intermediate) with a reversible intermediate reaction for a temperature upshift from 27 °C to 37 °C (Supplementary Text). Simulations are shown for various values of the Michaelis-Menten constants for the reversible reaction. The standard bottleneck is defined as \({K}_{M}=20\) mM, which has an activation energy of \({E}_{a}=22.5\) kcal/mol. Standard reactions have \({K}_{M}=1\) mM and \({E}_{a}=15\) kcal/mol. Simulations were conducted with saturating external nutrients (\({c}_{0}=100\) mM). Other parameters of the minimal TSEN can be found in Fig. 4a, b. Green: with a forward bottleneck only, described by a very large reverse \({K}_{M}=1000\) mM. Red: with bottlenecks in both the forward and reverse reactions. Blue: with a forward bottleneck and standard reverse reaction. Purple: with forward and reverse reactions both possessing standard \({K}_{M}\) values. b) The TSEN model responds to a nutrient pulse from a steady state with low nutrient concentration through increased metabolite production. The full TSEN (5 intermediate reactions) with a single bottleneck (standard kinetic values in black, bottleneck values in red on left) was simulated under sub-saturating, low-nutrient conditions (\({c}_{0}=\,\)0.1 mM) until steady state was reached, and then an instantaneous nutrient pulse of 28 mM was added at \(t=\) 0 min, with no nutrients subsequently provided. Simulations were performed in a 1 L container. Left: growth rate dynamics predicted by the bottlenecked TSEN after the nutrient pulse. Standard (black) and bottleneck (red) parameter values are shown. Middle: predicted intracellular metabolite concentrations, colored by location in network during the nutrient pulse and subsequent depletion. Dynamics depend on network position. Right: External nutrient concentration throughout the simulation. c) The TSEN model responds to starvation exit through slow metabolite production. The full TSEN (5 intermediate reactions) with a single bottleneck (standard kinetic values in black, bottleneck values in red on left) was simulated under starvation-like conditions (\({c}_{0}=\,\)0.01 mM) until steady state was reached, and then the nutrient concentration was shifted to a saturating condition (\({c}_{0}=\)100 mM) at \(t=\) 0 min. Left: growth rate dynamics after the nutrient shift predicted by the bottlenecked TSEN. Standard (black) and bottleneck (red) parameter values are shown. Right: intracellular metabolite concentrations, colored by position in network, during the shift.
Extended Data Fig. 9 E. coli exhibits Michaelis-Menten kinetics across substrates.
a) Left: Liquid-culture growth rates of E. coli MG1655 grown on a variety of substrates at 37 °C (Methods). Data are the mean of the maximum growth rate extracted from three biological replicate growth curves and error bars represent ±1 standard deviation (SD). Right: Expanded view of growth rates versus concentration from the outlined box on the left. b) Liquid-culture growth rates of E. coli MG1655 in MOPS minimal medium supplemented with various concentrations of D-glucose at 25 °C (blue), 30 °C (black), or 37 °C (red). Data are the mean of the maximum growth rate extracted from three biological replicate growth curves and error bars represent ±1 SD. c) Michaelis-Menten constants (\({K}_{M}\)) of E. coli MG1655 growth rates across growth media and temperatures. Data are estimates from a non-linear weighted fit and error bars represent ±1 SEM. d) Arrhenius plots of ln(growth rate) versus 1/(absolute temperature) for E. coli MG1655 grown in MOPS minimal medium supplemented with glucose at concentrations between 0.17 mM and 11 mM (blue-to-red). Data are the mean across three biological replicates and error bars represent ±1 SD. Weighted linear fits were performed for each concentration. e) Arrhenius plots of ln(growth rate) versus 1/(absolute temperature) for E. coli MG1655 grown in MOPS minimal medium supplemented with casamino acids at concentrations between 0.9 mM and 923 mM (blue-to-red). Data are the mean across three biological replicates and error bars represent ±1 SD. Weighted linear fits were performed for each concentration. f) Activation energy versus substrate concentration of E. coli MG1655 grown in minimal media without amino acids supplemented with glucose, fructose, acetate, succinate, or maltose. Activation energies are estimates from a linear weighted fit of Arrhenius plots and error bars represent ±1 SEM. g) Activation energy versus substrate concentration of E. coli grown in LB (red) or MOPS minimal medium supplemented with casamino acids (green). Activation energies are estimates from a linear weighted fit of Arrhenius plots and error bars represent ±1 SEM.
Extended Data Fig. 10 Growth rate response to a temperature downshift is rapid across organisms.
Single-cell growth rate response to a temperature downshift on rich medium (LB) of laboratory-evolved (blue, CS109, n=911 cells) and naturally isolated E. coli strains (orange to red, n=417-1186 cells), Escherichia fergusonii (purple, n=902 cells), and Bacillus subtilis (green, n=117 cells). All downshifts were from 37 °C to 25 °C, except for B. subtilis (37 °C to 27 °C). Data are the mean±1 SEM (shaded region) at each time point.
Supplementary information
Supplementary Information
Supplementary Table 1, Figs. 1–8 and Text.
Supplementary Table 1
Strains used in this study.
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Knapp, B.D., Willis, L., Gonzalez, C. et al. Metabolic rearrangement enables adaptation of microbial growth rate to temperature shifts. Nat Microbiol 10, 185–201 (2025). https://doi.org/10.1038/s41564-024-01841-4
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DOI: https://doi.org/10.1038/s41564-024-01841-4