Correction to: High-yield production of l-serine from glycerol by engineered Escherichia coli

Correction to: Journal of Industrial Microbiology & Biotechnology (2019) 46:221–230 https://doi.org/10.1007/s10295-018-2113-6

Unfortunately, the order of the Figs. 1–4 has been positioned wrongly in the print published article. Following are the corrections: Fig. 1 of this article should be placed in the position of Fig. 2, Fig. 2 should be placed in the position of Fig. 3, Fig. 3 should be placed in the position of Fig. 4, and Fig. 4 should be placed in the position of Fig. 1. The correct figures (Figs. 1, 2, 3, 4) are given below.

Fig. 1

l-serine biosynthesis pathways from glycerol in E. coli. Genes and enzymes: glycerol facilitator (glpF); glycerol kinase (glpK); glycerol 3-phosphate dehydrogenase (glpD); 3-phosphoglycerate dehydrogenase (serA); phosphoserine aminotransferase (serC); phosphoserine phosphatase (serB); cysteine/acetyl serine transporter (eamA); serine hydroxymethyltransferase (glyA); l-serine deaminases (sdaA, sdaB, and tdcG). Intermediates: dihydroxyacetone phosphate (DHAP); phosphoenolpyruvate (PEP); tricarboxylic acid cycle (TCA). Highlighted arrows indicate pathways in which genes were upregulated by overexpression eamA. Red crosses on solid lines ( ) indicate genes that were deleted. Crosses on dashed lines ( ) indicate the removal of feedback inhibition (color figure online)

Fig. 2

Comparison of glycerol consumption, cell growth, and l-serine production of strains W3110, G, GA and GAA. a Profiles of residual glycerol and cell density with strains W3110, G, and GA. Squares represent W3110, circles represent G, triangles represent GA, open symbols represent OD₆₀₀, closed symbols represent residual glycerol. b Profiles of glycerol consumption, cell growth and l-serine production in GAA. Squares represent residual glycerol, circles represent cell growth, triangles represent l-serine. Values denote the average of three independent experiments, and error bars indicate standard deviation

Fig. 3

Time course of l-serine production in the 4W strain during batch fermentation. Squares represent residual glycerol, circles represent cell growth, triangles represent l-serine. Values denote the average of three independent experiments, and error bars indicate standard deviation

Fig. 4

Comparison of glycerol consumption, cell growth and l-serine production in strains 4W-glpD–glpK and 4WA. a Profiles of 4W-glpD–glpK. b Profiles 4WA. Squares represent residual glycerol, circles represent cell growth, triangles represent l-serine. Values denote the average of three independent experiments, and error bars indicate standard deviation