Antifungal and Anti-Cariogenic Cellobio-Oligosaccharides Produced by Dextransucrase
申请人:Day Donal F.
公开号:US20110076240A1
公开(公告)日:2011-03-31
Cellobio-oligosaccharides (CBO) produced by the dextransucrase-catalyzed transglycosylation reaction of sucrose and cellobiose were discovered to be effective as antifungal agents against dental caries and against fungi who rely on glucan as an integral part of the cell wall, e.g.,
A. terreus
. The cellobio-oligosaccharides were found to be inhibitors of β-(1,3)-glucan synthase, an important enzyme involving in fungal cell wall component synthesis. The CBO caused structural changes in the growing fungal cells. In addition, the CBO were shown to be effective as anti-cariogenic agents in preventing bacterial adherence to teeth by inhibiting the formation of the bacterial plaque (glucans), e.g., that formed by
Streptococcus mutans
. Cellobio-oligosaccharides produced by dextransucrase were analyzed and shown to have a degree of polymerization (DP) ranging from 3 to 6 glucosyl groups. Examples of these cellobio-oligosaccharides produced by this method include, but are not limited to, trisaccharides such as α-D-glucopyranosyl-(1→2)-β-D-glucopyranosyl-(1→4)-D-glucopyranose and α-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl-(1→4)-D-glucopyranose.
通过蔗糖和纤维二糖的葡萄糖转移酶催化反应产生的纤维素寡糖(CBO)被发现对抗牙齿龋齿和依赖葡聚糖作为细胞壁重要组成部分的真菌,如A. terreus,具有抗真菌作用。发现纤维素寡糖是β-(1,3)-葡聚糖合酶的抑制剂,这是涉及真菌细胞壁组分合成的重要酶。CBO导致生长中的真菌细胞结构变化。此外,CBO被证明是预防细菌附着于牙齿的抗龋齿剂,通过抑制细菌斑(葡聚糖)的形成,例如Streptococcus mutans。通过葡糖转移酶产生的纤维素寡糖进行分析,显示具有3到6个葡萄糖基的聚合度(DP)。这种方法产生的纤维素寡糖的例子包括但不限于三糖,例如α-D-葡萄糖吡喃糖(1→2)-β-D-葡萄糖吡喃糖(1→4)-D-葡萄糖吡喃糖和α-D-葡萄糖吡喃糖(1→6)-β-D-葡萄糖吡喃糖(1→4)-D-葡萄糖吡喃糖。