化学
多糖
无规线圈
位阻效应
右旋糖酐
聚糖
分子
生物化学
立体化学
有机化学
圆二色性
糖蛋白
作者
I.C.M. Dea,Edwin R. Morris,David A. Rees,E. Jane Welsh,Howard A. Barnes,Jeffrey Price
标识
DOI:10.1016/s0008-6215(00)81935-7
摘要
Chiroptical, rheological, and n.m.r.-relaxation evidence is presented, to identify interactions of two types between different polysaccharides: (1) mutual exclusion of incompatible molecules, with consequent increase in the effective concentration of both; and (2) energetically favourable association of structurally and sterically regular chain-segments. β-1,4-linked plant polysaccharides interact by association of unsubstituted backbone regions, either with like chians, or with sterically compatible, unlike molecules. Extracellular polysaccharides (xanthans) of Xanthomonas plant pathogens maintain their ordered native conformation in solution, and this accounts for their industrially valuable, rheological peculiarities. These materials bind strongly to the plant glycans. Random-coil bacterial gums show no such interactions, although dextran enhances autogelation of galactomannans by exclusion. Extracellular polysaccharides from Arthrobacter species also have ordered native conformations in solution, but do not share the specific interactions of xanthan. Native xanthan shows marked specificity in its interactions with plant glycans, indicating a possible biological role in host-pathogen recognition.
科研通智能强力驱动
Strongly Powered by AbleSci AI