Fig. 4

GABA fermentation of gadB2-expressing C. glutamicum strains controlled by sigB promoter and some σ^B-recognized promoters. a Glu concentration, b GABA concentration, c GAD activity, d gadB2 transcription level. Circles R4a-B2, triangles PsigB-B2, diamonds Phmp-B2, empty squares in dotted line Ppqo-B2, empty circles in dotted line PilvE-B2, empty diamonds in dotted line PgapA-B2, empty triangles in dotted line Pcg1417-B2. White bars at 20 h, black bars at 40 h. Each point represents the average of three independent experiments