三种Streptococcus pneumoniae sialidases:三种不同的产品
Guogang Xu1, Milton J Kiefel, Jennifer C Wilson
1Biomedical Sciences Research Complex, University of St. Andrews, KY16 9ST, UK.
Journal of the American Chemical Society
|January 20, 2011
概括
肺炎 estreptococcus sialidases NanA,NanB和NanC是其生存和潜在的药物标的关键. 这项研究详细介绍了NanC.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 酶学 是一种酶学.
背景情况:
- 肺炎链球菌 (Streptococcus pneumoniae) 是一个重要的人类病原体,可引起肺炎,败血症和脑膜炎等严重疾病.
- 肺炎球菌化酶 (NanA,NanB,NanC) 是关键的毒性因素和潜在的治疗点.
- 了解这些化酶的特定酶活性对于开发新疗法至关重要.
研究的目的:
- 为了阐明Streptococcus pneumoniae sialidases,NanA,NanB和NanC的催化机制和产物.
- 描述NanC活动的初始产物及其随后的水化.
- 为了比较三种肺炎球菌化酶的催化机制.
主要方法:
- 核磁共振 (NMR) 光谱检测证实纳米的活性和产品的配置.
- 酶定量测试以确定NanB和NanC的产物.
- 纳米的初始产品及其化动态的表征.
主要成果:
- 纳纳作为一个乱交的 sialidase,释放Neu5Ac与保留的异构构的配置.
- B作为一个分子内转酸酶起作用,从α2,3-酸中选择性地产生2,7-酸-Neu5Ac.
- NanC的初始产品是2-脱氧-2,3-二二-N-乙烯基神经胺酸 (Neu5Ac2en),可以缓慢水到Neu5Ac.
结论:
- 这三种肺炎球菌化酶 (NanA,NanB,NanC) 可能共享一个共同的催化机制,直到最终产品形成.
- 独特的产品和机制表明,每种 sialidase 在 S. pneumoniae 病变发生过程中都有专门的作用.
- 对这些酶的进一步研究可能会导致针对S. pneumoniae的向抗菌策略.
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