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Core oligosaccharide : ウィキペディア英語版 | Core oligosaccharide
Core oligosaccharide (or Core-OS) is a short chain of sugar residues within Gram-negative lipopolysaccharide (LPS). Core-OS are highly diverse among bacterial species and even within strains of species ==Structure==
The core domain always contains an oligosaccharide component which attaches directly to lipid A and commonly contains sugars such as heptose and 3-deoxy-D-mannooctulosonic acid (also known as KDO, keto-deoxyoctulosonate). The LPS Cores of many bacteria also contain non-carbohydrate components, such as phosphate, amino acids, and ethanolamine substitutents. Many core structures have been described in the literature, this description is based on the ''traditional'' general structure (as found in enteric bacteria and ''Pseudomonads''). See the figure above for an overview of the structure found in ''E. coli'' R1.
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