针对PlyCYU内素的Streptococcus agalactiae表现出一种CHAP活性和一种调解多元化的葡萄糖胺酶域
Sakunrat Ubonprasert1, Wachiraporn Wachiradusit1, Wichai Pornthanakasem1
1National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Khlong Luang, Pathum Thani, Thailand.
Applied and environmental microbiology
|August 19, 2025
概括
像PlyCYU这样的菌体内素显示出强烈的杀菌活性,可以对菌菌种进行杀菌,这为抗生素提供了有前途的替代品. 葡萄糖氨基酶域对于PlyCYU至关重要.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 菌体内素是具有较低耐药性潜力的强效抗菌剂.
- 杆菌 (Streptococcus agalactiae) 在新生儿,牲畜和鱼类中引起重大感染.
- 抗生素耐药性需要开发新的抗菌战略.
研究的目的:
- 为了识别和表征一种新型的细菌体内溶素,PlyCYU,来自Streptococcus suis prophages.
- 评估PlyCYU对各种链球菌菌种的杀菌活性.
- 阐明PlyCYU域在其抗菌活性中的结构功能关系.
主要方法:
- 预兆序列的生物信息分析.
- 局部导向的突变发生和子域切断.
- 最低杀菌度 (MBC) 的测定.
- 尺寸排除色谱 (SEC) 结合多角度光散射和SEC-UV.
主要成果:
- PlyCYU对S. agalactiae,S. dysgalactiae和S. uberis表现出强大的杀菌活性 (MBC1.2540微米).
- N端氨基酶_5 (CHAP) 域具有催化活性,而C端葡萄糖氨基酶 (cyuLyz2) 域对于多元化和最大活性至关重要.
- PlyCYU和cyuLyz2形成同型多元体,有助于增强细菌解毒活性.
结论:
- PlyCYU是一种强效的内溶酶,具有针对关键链球菌病原体的显著杀菌活性.
- 葡萄糖氨基酶域在PlyCYU的四级结构和整体疗效中发挥着关键作用.
- PlyCYU代表了对新型抗生素开发的有希望的候选人,用于对抗链球菌感染和食品安全应用.
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