敲除pknG提高谷氨酸棒杆菌L-谷氨酸和GABA产量
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Deletion of pknG Improves the Production of L-Glutamate and GABA in Recombinant Corynbacterium glutamicum
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    摘要:

    γ-氨基丁酸(GABA)具有多种生理功能,被广泛应用于食品、医药等行业。在谷氨酸棒杆菌ATCC13032中表达来自短乳杆菌的两个谷氨酸脱羧酶(GAD)编码基因gadB1、gadB2,可将其自身积累的L-谷氨酸有效转变成GABA。为了进一步提高GABA产量,首先在ATCC13032中敲除了丝氨酸/苏氨酸蛋白激酶PknG的编码基因pknG,以提高GABA的前体物质L-谷氨酸的供应,然后将GAD表达质粒pJYW-4-gadB1-gadB2转入pknG敲除菌株和ATCC13032中,构建出重组菌SNW203和SNW200,最后对两个重组菌进行上罐发酵。结果表明:相对于SNW200,菌株SNW203的L-谷氨酸和GABA产量都有所提高。发酵72 h后,GABA产量为(30.2±0.3) g/L,相对于SNW200提高了55.4%,L-谷氨酸和GABA的总摩尔浓度为0.3 mol/L,提高了36.4%。这说明敲除pknG能够促进重组谷氨酸棒杆菌的L-谷氨酸和GABA生物合成。

    Abstract:

    Gama(γ)-aminobutyric acid(GABA),which has a variety of physiological functions,is widely used in food,pharmaceutical and other industries. Two L-glutamate decarboxylase(GAD) genes(gadB1 and gadB2) were co-expressed previously in an L-glutamate producing strain Corynebacterium glutamicum ATCC13032,making the own accumulated L-glutamate be effectively transformed into GABA. To further enhance GABA production,the pknG gene encoding serine/threonine protein kinase PknG was deleted to improve the supply of GABA precursor L-glutamate. Then the co-expression plasmid pJYW-4-gadB1-gadB2 was transformed into pknG deletion strain and ATCC13032,generating the recombinant C. glutamicum strains SNW203 and SNW200. After the strains were fermented in fermenters,the production of both L-glutamate and GABA in SNW203 increased greatly when compared with SNW200. At 72 h of fermentation,GABA production in SNW203 increased to (30.2±0.3) g/L,55.4% higher than that in SNW200 and the total concentration of L-glutamate and GABA reached up to 0.3 mol/L,36.4% higher than that in SNW200. This result indicates that the deletion of pknG improves the biosynthesis of L-glutamate and GABA in recombinant C. glutamicum.

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王楠楠,倪亚兰,史锋.敲除pknG提高谷氨酸棒杆菌L-谷氨酸和GABA产量[J].食品与生物技术学报,2017,36(2):187-193.

WANG Nannan, NI Yalan, SHI Feng. Deletion of pknG Improves the Production of L-Glutamate and GABA in Recombinant Corynbacterium glutamicum[J]. Journal of Food Science and Biotechnology,2017,36(2):187-193.

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  • 在线发布日期: 2017-04-28
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