复合氮源对土曲霉洛伐他汀生物合成的影响

Effect of complex nitrogen source on lovastatin biosynthesis from Aspergillus terreus

【目的】研究不同复合氮源对土曲霉生物合成洛伐他汀的影响。【方法】以酵母粉、蛋白胨、花生粉、燕麦粉、玉米浆和黄豆粉分别为复合氮源,通过摇瓶培养检测培养过程中洛伐他汀产量及其关键中间代谢物2-甲基丁酸盐和monacolinJ的积累量。【结果】以蛋白胨为氮源时,土曲霉细胞比生长速率最大,为8.06d-1;以花生粉为氮源时,洛伐他汀比产物合成速率最大,为1.44mg/(g·h),同时培养过程中2-甲基丁酸盐和monacolinJ对细胞得率明显高于其他氮源,均约为玉米浆的4倍;以酵母粉为氮源时,2-甲基丁酸盐的合成速率是monacolinJ的4倍,其monacolinJ转化率最高(92.0%),约是玉米浆的1.6倍。【结论】不同复合氮源不仅影响次级代谢的碳代谢流,还可能通过调控洛伐他汀合成途径中的关键酶(LovD或LovF)影响其生产。

【Objective】Effects of various complex nitrogen sources on lovastatin biosynthesis from As-pergillusterreus were investigated.【Method】The production of lovastatin and the accumulation of its key intermediate metabolites such as 2-methylbutyrate and monacolin J were determined in the cultures by shake flask cultivation when yeast extract powder,peptone,peanut meal,oat meal,corn steep liquor,and soybean meal were regarded as the complex nitrogen source,respectively.【Result】The highest specific growth rate of 8...