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拉姆诺格卢干的结构,这是从Streptococcus mutans细胞壁中提取的意想不到的稳定的多糖

Ana Carolina Dos Santos Ré¹, Jaime Aparecido Cury², Guilherme Lanzi Sassaki³

¹Department of BioMolecular Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, CEP 14040-903 Ribeirão Preto, SP, Brazil.

International journal of biological macromolecules

|February 13, 2024

概括

研究人员在Streptococcus mutans生物膜中发现了一种新的含拉姆诺斯的细胞壁多糖 (RhaCWP) 与细胞内多糖 (IPS) 一起存在. 热提取有效地将这些聚合物分离出来用于结构分析.

科学领域:

微生物学微生物学
生物化学生物化学
聚合物化学聚合物化学

背景情况:

突变性链球菌 (Streptococcus mutans) 是导致牙的关键病原体.
了解S. mutans多糖的结构对于开发有针对性的干预措施至关重要.
以前的研究集中在细胞内多糖体 (IPS) 上,但提取物中的细胞壁成分的特征较少.

研究的目的:

为了识别和表征在热提取物中存在的多糖体的Streptococcus mutans生物膜.
阐明一种新的含拉姆诺斯的细胞壁多糖体 (RhaCWP) 的化学结构,并将其与细胞内多糖体 (IPS) 进行比较.
评估热提取方法,同时分析细胞壁和细胞内多糖.

主要方法:

在热中提取Streptococcus mutans生物膜.
核磁共振 (NMR) 光谱用于结构阐明.
甲基化分析以确定糖酸链接.
扩散顺序的NMR光谱法用于确定分子量 (MW).

主要成果:

在提取物中发现了一种含拉姆诺斯的细胞壁多糖 (RhaCWP).
IPS的特征是具有1,6-α-葡萄糖分支点的1,4-α-D-葡萄糖.
RhaCWP具有1,2-α-L-和1,3-α-L-rhamnose的骨干,并具有1,2-α-D-葡萄糖侧链.
无论是IPS还是RhaCWP,它们的分子量均为11,298 Da.
热方法成功共提取并允许分析两种多糖类型.

结论:

从S. mutans生物膜中确定了一个新的RhaCWP结构.
热提取方法有效地同时获得和分析RhaCWP和IPS.
这种方法有助于进一步研究S. mutans聚合物的结构功能关系.

关键词:

生物膜是一种生物膜.牙腐烂是指牙的腐烂.细胞内部的多糖化物.拉姆诺格卢坎是一种葡萄糖.

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