The Pel polysaccharide is predominantly composed of a dimeric repeat of α-1,4 linked galactosamine and N-acetylgalactosamine.

The Pel polysaccharide is predominantly composed of a dimeric repeat of α-1,4 linked galactosamine and N-acetylgalactosamine.
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DOI:
10.1038/s42003-022-03453-2
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发表时间:
2022-05-26
影响因子:
5.9
通讯作者:
--
中科院分区:
生物学2区
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--
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合成生物膜基质胞外多糖 Pel 的遗传能力在革兰氏阴性和革兰氏阳性细菌中广泛存在。然而,其确切的化学结构一直难以确定。使用经过工程设计可过量产生 Pel 的铜绿假单胞菌菌株,改进分离程序,并用糖苷水解酶 PelAh 进行选择性水解,我们证明 Pel 是 α-1,4-N-乙酰半乳糖胺的部分脱 N-乙酰化线性聚合物,主要由半乳糖胺和 N-乙酰半乳糖胺的二聚重复组成。铜绿假单胞菌 Pel 胞外多糖的结构已得到充分表征。
The genetic capacity to synthesize the biofilm matrix exopolysaccharide Pel is widespread among Gram-negative and Gram-positive bacteria. However, its exact chemical structure has been challenging to determine. Using a Pseudomonas aeruginosa strain engineered to overproduce Pel, improvements to the isolation procedure, and selective hydrolysis with the glycoside hydrolase PelAh, we demonstrate that Pel is a partially de-N-acetylated linear polymer of α-1,4-N-acetylgalactosamine comprised predominantly of dimeric repeats of galactosamine and N-acetylgalactosamine. The structure of the Pel exopolysaccharide from Pseudomonas aeruginosa is fully characterized.
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