Capsular polysaccharides containing multiple sialic acid residues, particularly the Group B polysaccharide of Neisseria meningitidis, are modified by chemical reaction to randomly introduce pendant reactive residues of heterobifunctional linker molecules to the polysaccharide backbone. The capsular polysaccharide is deacetylated and the heterobifunctional linker molecule is reacted with the deacetylated material and any residual amino groups are blocked by reaction with alkyl acid anhydride. The introduction of the linker molecules to the polysaccharide chain between the termini enables the polysaccharide to be linked to a carrier molecule, such as a protein, to enhance the immunogenicity of the polysaccharide. The conjugate molecule may be formulated as an immunogenic composition for raising antibodies in a host to the polysaccharide.
通过化学反应对含有多个硅铝酸残基的胶囊多糖,特别是脑膜炎奈瑟氏菌的 B 组多糖进行修饰,在多糖骨架上随机引入杂双官能团连接分子的悬垂反应残基。胶囊多糖经过脱乙酰化处理,杂多官能团连接分子与脱乙酰化材料发生反应,任何残留的氨基基团通过与烷基酸酐反应被阻断。将连接分子引入多糖链的端部之间,可使多糖与蛋白质等载体分子连接,从而增强多糖的免疫原性。共轭分子可配制成免疫原性组合物,用于在宿主体内产生针对多糖的抗体。
Methods for purifying sialic acid-specific antibodies and composition comprising affinity-purified antibodies
申请人:The Regents of The University of California
公开号:EP2261255A1
公开(公告)日:2010-12-15
The present invention relates to a method of purifying sialic acid-specific antibodies, comprising the steps of:
(a) preparing antibodies to sialic acids;
(b) contacting the antibodies from step (a) with a first solid phase to which a sialic having a side chain has been attached; and
(c) contacting the antibodies that bound to the first solid phase with a second solid phase to which the sialic acid without the side chain has been attached.
Methods for detecting and analyzing n-glycolylneuraminic acid (Neu5Gc) specific antibodies in biological materials
申请人:The Regents of The University of California
公开号:EP2302390A1
公开(公告)日:2011-03-30
The present invention relates to a method of detecting anti-Neu5Gc specific antibodies in a biological material comprising the steps of:
(a) determining the amount of anti-Neu5Ac antibodies present in the material using Neu5Ac as an antigen target;
(b) determining the amount of anti-Neu5Gc antibodies present in the material using anti-Neu5Gc as an antigen target; and
(c) subtracting the amount of anti-Neu5Ac antibodies from the amount of anti-Neu5Gc antibodies to determine the amount of anti-Neu5Gc specific antibodies.
Multivalent immunogenic molecules comprise a carrier molecule containing at least one functional T-cell epitope and multiple different carbohydrate fragments each linker to the carrier molecule and each containing at least one functional B-cell epitope. The carrier molecule inputs enhanced immunogenicity to the multiple carbohydrate fragments. The carbohydrate fragments may be capsular oligosaccharide fragments from
Streptococcus pneumoniae
, which may be serotypes 1, 4, 5, 6B, 9V, 14, 18C, 19F or 23F, or
Neisseria meningitidis
, which may be serotype A, B, C, W-135 or Y. Such oligosaccharide fragments may be sized from 2 to 5 kDa. Alternatively, the carbohydrate fragments may be fragments of carbohydrate-based tumor antigens, such as Globo H, Le
Y
or STn. The multivalent molecules may be produced by random conjugation or site-directed conjugation of the carbohydrate fragments to the carrier molecule. The multivalent molecules may be employed in vaccines or in the generation of antibodies for diagnostic application.
多价免疫原分子包括一个含有至少一个功能性 T 细胞表位的载体分子和多个不同的碳水化合物片段,每个片段都与载体分子连接,且每个片段都含有至少一个功能性 B 细胞表位。载体分子为多个碳水化合物片段输入增强的免疫原性。碳水化合物片段可以是来自于
肺炎链球菌
可以是血清型 1、4、5、6B、9V、14、18C、19F 或 23F 的肺炎链球菌,或
脑膜炎奈瑟菌
这些寡糖片段的大小可为 2 至 5 kDa。或者,碳水化合物片段可以是基于碳水化合物的肿瘤抗原片段,如 Globo H、Le
Y
或 STn。多价分子可通过碳水化合物片段与载体分子的随机共轭或定点共轭产生。多价分子可用于疫苗或产生用于诊断的抗体。
FUSION PROTEINS FOR USE IN ENZYMATIC SYNTHYESIS OF OLIGOSACCHARIDES
申请人:——
公开号:US20020034805A1
公开(公告)日:2002-03-21
This invention provides fusion polypeptides that include a glycosyltransferase catalytic domain and a catalytic domain from an accessory enzyme that is involved in making a substrate for a glycosyltransferase reaction. Nucleic acids that encode the fusion polypeptides are also provided, as are host cells for expressing the fusion polypeptides of the invention.