高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (12): 20230378.doi: 10.7503/cjcu20230378

• 有机化学 • 上一篇    下一篇

丝胶蛋白源Tn和T抗原的释放制备及质谱分析

满丽娟1, 叶佳佳1, 张德锋1, 邹籽华2, 黄琳娟1, 王仲孚1, 王承健1()   

  1. 1.陕西省天然多糖资源利用工程研究中心, 西北大学食品科学与工程学院, 西安 710069
    2.西北大学生命科学学院, 西安 710069
  • 收稿日期:2023-08-23 出版日期:2023-12-10 发布日期:2023-10-27
  • 通讯作者: 王承健 E-mail:wangchj@nwu.edu.cn
  • 基金资助:
    国家自然科学基金(31971215)

Preparative Release and Mass Spectrometric Analysis of Tn and T Antigens Existing in Sericin

MAN Lijuan1, YE Jiajia1, ZHANG Defeng1, ZOU Zihua2, HUANG Linjuan1, WANG Zhongfu1, WANG Chengjian1()   

  1. 1.Shaanxi Natural Carbohydrate Resource Engineering Research Center,College of Food Science and Technology,Northwest University,Xi’an 710069,China
    2.College of Life Sciences,Northwest University,Xi’an 710069,China
  • Received:2023-08-23 Online:2023-12-10 Published:2023-10-27
  • Contact: WANG Chengjian E-mail:wangchj@nwu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(31971215)

摘要:

以蚕茧丝胶蛋白源Tn抗原和T抗原为研究对象, 采用“一釜法”、 氨水催化法和链霉蛋白酶E(Pronase E)水解法对丝胶蛋白O-糖链进行释放, 并通过固相萃取柱进行分级纯化, 以高效液相色谱仪(HPLC)进行分离制备; 利用电喷雾质谱(ESI-MS)、 串联质谱(MS/MS)及在线液相色谱-质谱联用仪(Online LC-MS)进行了结构鉴定和定量分析. 结果表明, 丝胶蛋白中O-GalNAc含量为1.58 μg/g, O-GalNAcGal含量为0.54 μg/g, 二者丰度比约为5.3∶1; 并且氨水可高效释放出其还原性O-连接单糖GalNAc, 通过液相色谱法可实现其精细分离纯化, 而以等量Pronase E对丝胶蛋白水解可有效释放出Tn抗原和T抗原.

关键词: Tn和T抗原, 丝胶蛋白, O-糖链释放, 高效液相色谱, 质谱

Abstract:

Silkworm sericin-derived Tn and T antigens, a group of biomarkers of many cancers, were targeted in this study. The O-glycans of sericin were first released using the “one-pot” non-reductive release method, the ammonia-catalyzed non-reductive release strategy and the pronase E digestion approach. The samples were subsequently fractionated for purification using solid-phase extraction columns and separated for preparation via high-performance liquid chromatography(HPLC). The generated glycan samples were finally analyzed in detail by means of electrospray ionization mass spectrometry(ESI-MS), tandem mass spectrometry(MS/MS) and liquid chromatography coupling online with mass spectrometry(Online LC-MS). The obtained results showed that the O-glycans of sericin just include O-GalNAc and O-GalNAcGal, the contents of which have been determined to be 1.58 μg/g and 0.54 μg/g, respectively. Their molar ratio in sericin is approximately 5.3∶1. The O-linked monosaccharide of sericin, GalNAc, allows efficient non-reductive release as a reducing form in ammonium hydroxide and fine separation by liquid chromatography. Tn and T antigens can be efficiently generated from sericin using pronase E with an amount equal to the raw glycoprotein.

Key words: Tn and T antigens, Sericin, O-Glycan release, High-performance liquid chromatography, Mass spectrometry

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