Study on the Breeding of Histidine Producing Mutant and Its Properties / 微生物学通报

A L-histidine producing mutant was derived from Corynebacterium glutamicum HZ4221(TRA R DCP R AMT R histidase - )by means of mutagenesis with N-methy-N′-nitro- N-nitrosoguanidine(NTG).Contrast to original strain,the amount of histidine accumulation reached to a level of 5.31g/L in a medium containing 80g/Lglucose and 30g/L ammonium sulfate after cultured for 72 hours; the transketolase activity reduced to a degree of 15.7%.The utilization of the carbon sources,genetic stability,effect of metal ions were also been investigated in this paper.