重组毕赤酵母产β-甘露聚糖酶的高密度发酵研究
Study on high-density fermentation ofβ-mannanase produced by constitutivePichia pastoris
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摘要:通过摇瓶实验,对重组毕赤酵母X-33/pGAPZαA-Man26A-39发酵培养基的碳源、氮源进行筛选,并在50 L发酵罐中采用间歇流加策略,对其发酵条件进行调控,以实现重组毕赤酵母高密度发酵产 β-甘露聚糖酶.结果表明:葡萄糖为发酵培养基的最适碳源,其初始添加质量浓度为30 g/L;初始质量分数为6%的玉米浆作为发酵培养基的氮源较为适宜;在间歇补料发酵调控中,通过间歇流加体积分数为25%的氨水、质量分数为50%的葡萄糖溶液和质量分数为20%的玉米浆,可使发酵液pH值维持在5.0~5.5之间,且保证发酵培养基的碳源、氮源充足;发酵60 h时采取放罐措施,此时酶活力可达2 685.5 U/mL,菌体质量浓度达331.1 g/L, OD 600达302.8,实现了 β-甘露聚糖酶的高效表达.Abstract:The carbon and nitrogen sources of the constitutive Pichia pastorisX-33/pGAPZαA-Man26A-39 fermentation medium were optimized by shake flask experiment,and the fermentation conditions were regulated in a 50 L fermentor by using intermittent feeding strategy,in order to realize high-density fermentation of constitutive Pichia pastoristo produce β-mannanase.The results showed that glucose was the most suitable carbon source for fermentation medium,and its initial centration was 30 g/L;corn syrup was the most suitable nitrogen source,and its initial mass fraction was 6%;during the regulation of intermittent fed fermentation,the pH value of bacteria could be maintained between 5.0~5.5 by intermittent flow adding 25% ammonia hydroxide,50% glucose solution and 20% corn syrup,and make sure the carbon and nitrogen sources of the fermentation medium were sufficient;after 60 h fermentation,took measures to put the fermentater tank,at this time,the maximum enzyme activity was 2 685.5 U/mL,the mass concentration of bacteria reached 331.1 g/L,and the OD 600reached 302.8,which achieved the high expression of β-mannanase.
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