Fig. 3
From: Genetic and nutrient modulation of acetyl-CoA levels in Synechocystis for n-butanol production
Overview of metabolic effects on Synechocystis during nitrogen starvation. Metabolites (red squares) with potential influence on butanol synthesis were quantified at nitrogen replete (N+) and deplete (N−) conditions. Glycogen levels are relative to wild type at N−, which is defined as 100 %. Heterologous enzymes (in blue): xfpk (phosphoketolase, B. breve), phaJ (enoyl-CoA hydratase, A. caviae), ter (trans-enoyl-CoA reductase, T. denticola) and adhE2 (bifunctional aldehyde/alcohol dehydrogenase, C. acetobutylicum). Native enzymes (in green): phaA (beta-ketothiolase), phaB (acetoacetyl-CoA reductase), pta (phosphotransacetylase), ackA (acetate kinase), acs (acetyl-CoA synthetase). Error bars represent SD of biological duplicates for the acetyl-CoA, acetate and NAD+/NADH quantifications and biological triplicates for the glycogen and PHB quantifications. ND not detectable. Absolute metabolite values are listed in Additional file 1: Table S1