FIG 1 .

Growth characteristics of strain 22A and its MDH mutant derivatives. (A) Growth of strain 22A on 0.5% methanol or succinate in the presence of 30 µM La³⁺, Ho³⁺, and Lu³⁺. Cell yield is shown as OD₆₀₀ values at 120 h. (B) Growth of strain 22A on methanol at different concentrations in the absence (open symbols) or presence (gray symbols) of 30 µM La³⁺. Cell yield is shown as OD₆₀₀ values at 144 h. Statistical analysis was done using two-way analysis of variance with Bonferroni’s post hoc test. Only a P value of <0.05 for the effect of La³⁺ addition is shown. (C) Growth of the strain 22A wild type and mxaF, mxaF xoxF1, and xoxF1 mutants on 0.5% methanol in the absence (open symbols) or presence (gray symbols) of 30 µM La³⁺. Cell yield is shown as OD₆₀₀ values at 161 h. Statistical analysis was done using two-way analysis of variance with Tukey’s post hoc tests. Only P values of interest are shown. ns, not significant statistically (P > 0.05) between the wild type and the mxaF mutant in the presence of La³⁺. (D) Growth of the strain 22A wild type (open symbols) and mxaF mutant (gray symbols) on 0.5% methanol in the presence of different concentrations of La³⁺. Cell yield is shown as OD₆₀₀ values at 209 h. All experiments were performed in triplicate, and error bars show the standard deviation (SD). The specific growth rate and cell yield are shown as bars and circles, respectively.