CN110904063A - 一种核苷磷酸化酶的发酵工艺及其应用方法 - Google Patents
一种核苷磷酸化酶的发酵工艺及其应用方法 Download PDFInfo
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Abstract
本发明公开了一种核苷磷酸化酶的发酵工艺及其应用方法,它是核苷磷酸化酶的种子接种到培养基上,经过发酵培养,制得含有核苷磷酸化酶的发酵液;培养基包碳源、氮源、硫酸铵、磷酸二氢钾、磷酸氢二铵、硫酸镁、柠檬酸和消泡剂,在发酵培养过程中控制好温度为、空气流量、罐压、溶氧水平、pH值和发酵周期。它的应用方法是将核苷磷酸化酶加入到含有胞苷、肌苷、鸟苷和腺苷的一种或多种的底物水溶液或者发酵液中,控制好底物浓度、核苷磷酸化酶加入量、转化温度、pH值和转化时间。该工艺技术控制简易,容易工业化放大,且发酵终点生物量大;转化胞苷、肌苷、鸟苷和腺苷效率高。
Description
技术领域
本发明属于生物制药技术领域,尤其是一种核苷磷酸化酶的发酵工艺及其应用方法。
背景技术
核苷磷酸化酶,是核苷补救代谢途径中的关键酶,能够可逆地催化嘌呤核苷、嘧啶核苷磷酸化的酶,属于N-水解和转移酶家族,广泛存在于真核或者原核细胞中。
随着全球艾滋病感染群体日益增多,作为“鸡尾酒”疗法中的拉米夫定、替诺福韦需求量急剧增加,作为拉米夫定、替诺福韦的关键中间体的胞嘧啶和腺嘌呤,开发廉价、大规模生产这两个游离碱基的工艺成为关注的焦点。传统的化学合成法,工艺路线长、有机溶剂使用量大,存在着生产成本高、安全风险大的缺点。生物酶法催化核苷生产游离碱基,是一种绿色、低成本的生产工艺,但目前这一类的技术报道都停留在实验室阶段,同时存在着底物浓度低、催化效率慢的缺点。
本发明通过对核苷磷酸化酶发酵配方、工艺控制进行研究,获得高生物量的核苷磷酸化酶发酵液,并通过研究其转化条件,解决上述技术难题。
发明内容
本发明的目的在于提供一种核苷磷酸化酶的发酵工艺,该工艺技术控制简易,容易工业化放大,且发酵终点生物量大。
本发明的另一目的在于提供一种核苷磷酸化酶在转化胞苷、肌苷、鸟苷和腺苷中的应用方法,该方法转化率高。
本发明的技术方案是这样实现的:
一种核苷磷酸化酶的发酵工艺,它是核苷磷酸化酶的种子接种到培养基上,经过发酵培养,制得含有核苷磷酸化酶的发酵液;其特征在于:
所述的培养基包含如下组分:碳源5-30g/L,氮源5-35g/L,硫酸铵0.5-1.5g/L,磷酸二氢钾2-20g/L,磷酸氢二铵2-20g/L,硫酸镁0.5-1.5g/L,柠檬酸0.2-1.0g/L,消泡剂0.1-0.2ml/L。
进一步,所述的碳源是指葡萄糖、甘油、果糖中的一种或多种。
进一步,所述的氮源是指大豆蛋白胨、酵母粉、玉米浆、黄豆粉的一种或多种。
进一步,所述的酵母粉是指啤酒或者面包酵母粉。
进一步,在核苷磷酸化酶的发酵培养过程中,发酵温度为35-39℃,空气流量0.5-1VVM,罐压0.03-0.05MPa,溶氧水平10-40%,pH值6.0-7.5,发酵周期20-35小时。
上述工艺方法制备的核苷磷酸化酶在转化胞苷、肌苷、鸟苷和腺苷中的应用方法,它是将核苷磷酸化酶加入到含有胞苷、肌苷、鸟苷和腺苷的一种或多种的底物水溶液或者发酵液中,底物浓度为30-200g/L(底物水溶液中含有的胞苷、肌苷、鸟苷和腺苷合计浓度),核苷磷酸化酶相对底物加入量为0.25-2.5ml/g,转化温度35-39℃,pH值6.0-7.0,转化时间1-6小时。
本发明和现有技术相比的优点为:
(1)发酵配方中无特殊来源的培养基,且原料价格低廉。
(2)发酵工艺控制简易,容易工业化放大,且发酵终点生物量大。
(3)由于发酵终点生物量大,在转化过程中底物浓度高,加入酶的比例低,且转化时间短。
具体实施方式
为使本发明的技术方案更加清楚,下面通过具体实施例对本发明作进一步详细的描述。
实施例1:将核苷磷酸化酶的种子接种到如下培养基中,葡萄糖10g/L,大豆蛋白胨5g/L,黄豆粉10g/L,玉米浆10g/L,硫酸铵0.8g/L,磷酸二氢钾10g/L,磷酸氢二铵5g/L,硫酸镁0.5g/L,柠檬酸0.5g/L,消泡剂0.15ml/L,在温度37℃,空气流量:0-18小时0.8VVM,18-28小时0.6VVM,罐压0.04MPa,溶氧水平10-20%,pH6.5,培养28小时发酵结束。测得菌体生物量75g/L。
实施例2:将核苷磷酸化酶的种子接种到如下培养基中,葡萄糖5g/L,甘油5g/L,酵母粉10g/L,黄豆粉5g/L,玉米浆20g/L,硫酸铵0.8g/L,磷酸二氢钾10g/L,磷酸氢二铵5g/L,硫酸镁0.5g/L,柠檬酸0.5g/L,消泡剂0.20ml/L,在温度39℃,空气流量:0-16小时0.8VVM,16-28小时0.6VVM,罐压0.04MPa,溶氧水平15-25%,pH6.2,培养28小时发酵结束。测得菌体生物量88g/L。
实施例3:将核苷磷酸化酶的种子接种到如下培养基中,果糖5g/L,甘油10g/L,酵母粉10g/L,大豆蛋白胨5g/L,玉米浆15g/L,硫酸铵1.0g/L,磷酸二氢钾5g/L,磷酸氢二铵15g/L,硫酸镁1.0g/L,柠檬酸1.0g/L,消泡剂0.20ml/L,在温度35℃,空气流量:0-10小时0.6VVM,10-25小时0.8VVM,25-32小时1.0VVM,罐压0.04MPa,溶氧水平10-25%,pH6.8,培养32小时发酵结束。测得菌体生物量105g/L。
实施例4:取例1中的酶发酵液200ml,加入到胞苷浓度50g/L、鸟苷浓度100g/L的1L水溶液中,调节pH至6.5,在37℃转化4小时,取样进HPLC检测转化液各组分纯度,胞苷0.13%,鸟苷纯度0.13%,两种底物的转化率超过99.5%。
实施例5:取例1中的酶发酵液100ml,加入到腺苷浓度70g/L、肌苷浓度100g/L的1L水溶液中,调节pH至6.5,在37℃转化5小时,取样进HPLC检测转化液各组分纯度,腺苷0.22%,肌苷纯度0.05%,两种底物的转化率超过99.2%。
实施例6:取例2中的酶发酵液150ml,加入到胞苷浓度100g/L、腺苷浓度100g/L的1L水溶液中,调节pH至6.2,在39℃转化3.5小时,取样进HPLC检测转化液各组分纯度,胞苷0.22%,腺苷纯度0.11%,两种底物的转化率超过99.3%。
实施例7:取例3中的酶发酵液50ml,加入到腺苷浓度50g/L、鸟苷浓度100g/L的1L水溶液中,调节pH至6.8,在35℃转化3小时,取样进HPLC检测转化液各组分纯度,腺苷0.08%,鸟苷纯度0.10%,两种底物的转化率超过99.5%。
实施例8:取例3中的酶发酵液150ml,加入到肌苷发酵液88g/L、鸟苷发酵液47g/L的1L混合液中,调节pH至6.8,在35℃转化5小时,取样进HPLC检测转化液各组分纯度,肌苷0.18%,鸟苷纯度0.11%,两种底物的转化率超过99.5%。
实施例9:取例2中的酶发酵液150ml,加入到鸟苷发酵液38g/L、腺苷发酵液41g/L的1L混合液中,调节pH至6.2,在39℃转化4.5小时,取样进HPLC检测转化液各组分纯度,鸟苷0.27%,腺苷纯度0.16%,两种底物的转化率超过99.3%。
Claims (6)
1.一种核苷磷酸化酶的发酵工艺,它是核苷磷酸化酶的种子接种到培养基上,经过发酵培养,制得含有核苷磷酸化酶的发酵液;其特征在于:所述的培养基包含如下组分:碳源5-30g/L,氮源5-35g/L,硫酸铵0.5-1.5g/L,磷酸二氢钾2-20g/L,磷酸氢二铵2-20g/L,硫酸镁0.5-1.5g/L,柠檬酸0.2-1.0g/L,消泡剂0.1-0.2ml/L。
2.根据权利要求1所述的核苷磷酸化酶的发酵工艺,其特征在于:所述的碳源是指葡萄糖、甘油、果糖中的一种或多种。
3.根据权利要求2所述的核苷磷酸化酶的发酵工艺,其特征在于:所述的氮源是指大豆蛋白胨、酵母粉、玉米浆、黄豆粉的一种或多种。
4.根据权利要求3所述的核苷磷酸化酶的发酵工艺,其特征在于:所述的酵母粉是指啤酒或者面包酵母粉。
5.根据权利要求4所述的核苷磷酸化酶的发酵工艺,其特征在于:在核苷磷酸化酶的发酵培养过程中,发酵温度为35-39℃,空气流量0.5-1VVM,罐压0.03-0.05MPa,溶氧水平10-40%,pH值6.0-7.5,发酵周期20-35小时。
6.权利要求1至5任意一项所述的工艺制备的核苷磷酸化酶在转化胞苷、肌苷、鸟苷和腺苷中的应用方法,它是将核苷磷酸化酶加入到含有胞苷、肌苷、鸟苷和腺苷的一种或多种的底物水溶液或者发酵液中,底物浓度为30-200g/L,核苷磷酸化酶相对底物加入量为0.25-2.5ml/g,转化温度35-39℃,pH值6.0-7.0,转化时间1-6小时。
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