Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (12): 20230378.doi: 10.7503/cjcu20230378

• Organic Chemistry • Previous Articles     Next Articles

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)

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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