糖载体对Streptococcus thermophilus中的银河糖利用的影响
Jiancun Zhao1, Yan Liang2,3, Susu Zhang4
1Department of Pharmacy and Biotechnology, Zibo Vocational Institute, Zibo, China.
Frontiers in microbiology
|December 11, 2023
概括
热菌 (Streptococcus thermophilus) 使用乳糖和银河糖,但银河糖的使用是特定于菌株的. 这项研究确定了影响S. thermophilus中银河糖代谢的关键糖载体特性.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 热菌 (Streptococcus thermophilus) 是一种重要的乳制品初始培养物.
- 牛奶中的乳糖是其主要的碳来源,但银河糖的利用在各个菌株之间有所不同.
- 遗传因素显著影响S. thermophilus的糖代谢.
研究的目的:
- 研究乳糖浸透酶在S. thermophilus糖利用中的作用.
- 为了确定特定的载体域对乳糖和银河糖代谢的影响.
- 探索异质载体在S. thermophilus中吸收银河糖的潜力.
主要方法:
- 一个缺乏乳糖透酶的S. thermophilus突变体 (ΔlacS) 的构建.
- 与表达S. thermophilus和E. coli乳糖浸透和载体的载体进行补充.
- 在乳糖和银河糖介质中复合菌株的生长分析.
主要成果:
- 德拉克斯突变体失去了代谢乳糖和银河糖的能力.
- 全长的S. thermophilus乳糖浸透恢复了两种糖的生长.
- 乳糖浸透酶的N端域使乳糖能够利用,但不能利用银河糖.
- 大肠杆菌的银河糖/质子同载体促进了突变体中银河糖的生长.
结论:
- 糖载体特性对于S. thermophilus的银河糖利用至关重要.
- 乳糖浸透酶的特定域对于银河糖运输至关重要.
- 异质载体,如大肠杆菌的银河糖/质子同载体,可以赋予银河糖代谢能力.
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