斯塔菲洛科克斯肉毒菌的主要自解素 (AtlC) 的表征
Maximilian Merz1, Carolin J Schiffer1, Andreas Klingl2
1Chair of Microbiology, Technical University of Munich, Gregor-Mendel-Straße 4, 85354, Freising, Germany.
BMC microbiology
|March 8, 2024
概括
葡萄球菌肉毒菌的自溶主要由AtlC酶介导. 在发酵过程中,AtlC被降解成更小,活跃的碎片.
科学领域:
- 微生物学 微生物学
- 食品科学 食品科学 食品科学
- 生物化学 生化学
背景情况:
- 已知细菌通过糖酸酶 (PGH) 自溶,影响食品发酵,如奶酪成熟.
- 肉毒杆菌对生香肠发酵至关重要,有助于酸盐的减少和风味的发展.
- 在S. carnosus自解中,尤其是主要的自解素 (Atl) 中,PGHs的作用尚不清楚.
研究的目的:
- 为了研究来自S. carnosus菌株的PGHs对自溶性行为的影响.
- 为了确定负责S. carnosus. autolysis的关键酶.
- 分析自溶过程和自溶的潜在降解.
主要方法:
- 在S. carnosus.中为特定的PGH基因生成淘汰突变物.
- 用显微镜分析突变的表型分析,包括生长,细胞分裂和形态学.
- 细胞图分析用于识别和表征酸酶及其碎片.
主要成果:
- AtlC突变菌株表现出生长受损,自解显著减少,细胞分离失败,形成.
- 突变者表面粗和不规则,与光滑的野生类型表面形成鲜明对比.
- 细胞图显示了AtlC的八种加工中间体,表明它随着时间的推移被降解成更小的细胞壁活跃碎片.
结论:
- AtlC 是一个关键的因素,它调解了Staphylococcus carnosus的自解.
- AtlC的失活会导致显著的表型变化,包括生长受损和细胞分裂.
- 在自溶性过程中,Autolysin AtlC被加工成更小,活跃的碎片.
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