一种新的酸酶逆转了Leloir路径,促进了从葡萄糖中合成塔加的合成
Aaron M Love1,2, Christopher G Toomey1,3, Abhishek Kumar4
1Manus Bio, Waltham, MA 02453.
bioRxiv : the preprint server for biology
|August 6, 2025
概括
研究人员开发了一种新方法,利用工程化大肠杆菌*从葡萄糖中制造罕见的糖d-塔加. 这种新的生物化学途径为生产这种低热量甜味剂提供了一种更有效和更具成本效益的方法.
科学领域:
- 生物化学和代谢工程
- 碳水化合物化学和酶学
- 食品科学与技术 食品科学与技术
背景情况:
- d-Tagatose是一种低热量单糖甜味剂,具有健康益处,如低血糖指数和益生菌性质.
- 目前从银河糖中生产d-塔加的工业生产是低效和昂贵的.
- 现有的替代生物合成途径在产量和原料成本方面存在局限性.
研究的目的:
- 通过使用*Escherichia coli*全细胞过程,证明一种用于直接从葡萄糖中产生d-塔加的新生化学途径.
- 设计大肠杆菌以利用新发现的银河糖-1-酸盐选择性酸酶来逆转Leoir路径.
- 为了实现d-塔加生物合成的高理论产量.
主要方法:
- 用一种新型的银河糖-1-酸盐选择性酸酶改造的 *Escherichia coli* 逆转了 Leloir 途径,将葡萄糖转化为银河糖.
- 酸酶与l-阿拉比诺酸异构酶的联合表达,将银河糖转化为塔加.
- 对酶基质相互作用的分析,重点关注控制特异性的分子间键.
主要成果:
- 从葡萄糖中证明了从葡萄糖中产生银河糖的产量,产量为35% (从30g/L葡萄糖中约10.5g/L).
- 在初步研究中,直接从葡萄糖中产生超过1g/L的d-塔加.
- 确定了d-塔加生产的理论途径收益率为94.9%,远高于以前的方法.
结论:
- 已经成功地证明了一种新的,高效的*in vivo*生物化学途径,用于直接从葡萄糖中产生d-塔加.
- 工程 * Escherichia coli * 系统为当前低效和昂贵的d-塔加制造工艺提供了一个有前途的替代方案.
- 这些发现突显了酶工程和代谢途径操纵在可持续甜味剂生产中的潜力.
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