Fig. 1

Effects of phosphate concentration on erythromycin (ErA) production and ery transcription. a ErA production and biomass yield of S. erythraea strain in low (40 μM (MG-P−) and high (10 mM, MG-P+) concentrations of phosphate in MG medium (50 g/L starch, 60 mM glutamate). b The transcriptional profiles of some genes in ery cluster responding to high (MG-P+) and low (MG-P−) phosphate