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. 2020 Jan 23;11:27. doi: 10.3389/fmicb.2020.00027

TABLE 1.

Mutational analysis and fermentation profiles of anaerobically adapted ΔptsG mutants.

Metabolites (mM)
Strain Genotype Fermentation time (h)a OD600nm Residual D-glucoseb Acetate Ethanol Formate Lactate Succinate Succinate ratioc (fold)
BW25113 Wild-type 6 5.63 ± 0.13 NDd 38.6 ± 0.2 36.4 ± 0.3 73.1 ± 0.1 10.3 ± 0.1 6.0 ± 0.0 0.04 (1.0)
HK620* ΔptsG 48 2.68 ± 0.07 ND 40.8 ± 0.2 29.1 ± 0.2 58.3 ± 0.8 5.21 ± 0.4 21.8 ± 0.6 0.15 (3.9)
HK622* ΔptsG mlc:IS5 (1203 bp) 9 4.98 ± 0.37 ND 35.9 ± 0.4 34.6 ± 0.4 65.0 ± 1.2 18.7 ± 0.1 7.4 ± 0.1 0.05 (1.3)
HK623 ΔptsG Δmlc (∼6 kb deletion) 9 5.01 ± 0.15 ND 35.8 ± 0.2 33.1 ± 1.8 64.6 ± 0.4 17.6 ± 0.6 7.2 ± 0.1 0.05 (1.3)
HK633 ΔptsG mlc:IS1 (768 bp) 9 5.18 ± 0.24 ND 35.5 ± 0.3 31.8 ± 1.0 64.2 ± 0.9 17.8 ± 0.9 7.2 ± 0.1 0.05 (1.3)
HK635* ΔptsG (adapted) mlc C904T (Q302Z) 9 5.06 ± 0.28 ND 35.8 ± 0.3 34.5 ± 1.1 64.7 ± 0.6 17.1 ± 0.2 6.9 ± 0.1 0.05 (1.2)
HK638* ΔptsG (adapted) mlc C649T (Q217Z) 9 4.86 ± 0.09 ND 35.7 ± 0.3 34.9 ± 0.4 63.2 ± 0.5 17.7 ± 0.6 7.2 ± 0.2 0.05 (1.3)
HK639 ΔptsG (adapted) mlc Δ1101G 9 5.14 ± 0.22 ND 36.0 ± 0.1 35.1 ± 0.1 64.0 ± 0.4 17.0 ± 0.1 7.1 ± 0.0 0.05 (1.2)
HK641 ΔptsG (adapted) mlc C43T (G14Z) 9 5.14 ± 0.14 ND 35.7 ± 0.1 35.3 ± 0.3 63.5 ± 0.2 17.6 ± 0.7 7.2 ± 0.2 0.05 (1.2)

*Whole genomic sequencing was performed. aFermentation time (h) when glucose was completely consumed. bResidual D-glucose concentration. 50 mM glucose was added initially in the fermentation medium. cCalculated as succinic acid/(succinate + lactate + formate + acetate + ethanol). dND, not detected.