Fig. 1

Construction of ΔadhE1 and ΔadhE2. The single construction of ΔadhE2 and three different constructions of ΔadhE1 are described: ΔCA_C1502ΔuppΔadhE2::catP (a), ΔCA_C1502ΔuppΔadhE1::catP (b), ΔCA_C1502ΔuppΔadhE1 (c), and ΔCA_C1502ΔuppΔadhE1::catP-A1A4 (d). P1 indicating the promoter of the sol operon and ORF L were previously proposed by Fischer et al. [11]