首页> 外文期刊>Journal of mass spectrometry: JMS >Revealing the glycation sites in synthetic neoglycoconjugates formed by conjugation of the antigenic monosaccharide hapten of Vibrio cholerae O1, serotype Ogawa with the BSA protein carrier using LC-ESI-QqTOF-MS/MS
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Revealing the glycation sites in synthetic neoglycoconjugates formed by conjugation of the antigenic monosaccharide hapten of Vibrio cholerae O1, serotype Ogawa with the BSA protein carrier using LC-ESI-QqTOF-MS/MS

机译:使用LC-ESI-QqTOF-MS / MS揭示霍乱弧菌O1血清型Ogawa的抗原性单糖半抗原与BSA蛋白载体缀合形成的合成新糖缀合物中的糖基化位点

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In this manuscript, we present the determination of glycation sites in synthetic neoglycoconjugates formed by conjugation of the antigenic monosaccharide hapten of Vibrio cholerae O1 serotype Ogawa to BSA using nano- liquid chromatography electrospray ionization quadrupole time-of-flight tandem mass spectroscopy (LC-ESI-QqTOF-MS/MS). The matrix-assisted laser desorption/ionization-TOF/TOF-MS/MS analyses of the tryptic digests of the glycoconjugates having a hapten:BSA ratio of 4.3:1, 6.6:1 and 13.2:1 revealed only three glycation sites, on the following lysine residues: Lys 235, Lys 437 and Lys 455. Digestion of the neoglycoconjugates with the proteases trypsin and GluC V8 gave complementary structural information and was shown to maximize the number of recognized glycation sites. Here, we report identification of 20, 27 and 33 glycation sites using LC-ESI-QqTOF-MS/MS analysis of a series of synthetic neoglycoconjugates with a hapten:BSA ratio of, respectively, 4.3:1, 6.6:1 and 13.2:1. We also tentatively propose that all the glycated lysine residues are located mainly near the outer surface of the protein.
机译:在本手稿中,我们使用纳米液相色谱电喷雾电离四极杆飞行时间串联质谱(LC-ESI),确定了由霍乱弧菌O1血清型Ogawa抗原性单糖半抗原与BSA缀合形成的合成新糖缀合物中的糖基化位点-QqTOF-MS / MS)。半抗原:BSA比为4.3:1、6.6:1和13.2:1的糖缀合物的胰蛋白酶消化物的基质辅助激光解吸/电离-TOF / TOF-MS / MS分析显示,在糖基上只有三个糖基化位点。赖氨酸残基:Lys 235,Lys 437和Lys455。用蛋白酶胰蛋白酶和GluC V8消化新糖缀合物可得到互补的结构信息,并显示出可最大化识别的糖基化位点。在这里,我们报告了使用LC-ESI-QqTOF-MS / MS分析一系列半抗原:BSA比分别为4.3:1、6.6:1和13.2的合成新糖缀合物鉴定出20、27和33个糖基化位点的方法: 1。我们还初步提议所有糖基化的赖氨酸残基主要位于蛋白质的外表面附近。

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