高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (6): 1776.doi: 10.7503/cjcu20200671

• 化学生物学 • 上一篇    下一篇

肝素非还原端饱和结构的紫外吸收研究及在肝素寡糖测序中的应用

梁群焘1, 邹强3, 林江慧2, 刘树滔1, 魏峥2()   

  1. 1.福州大学生物科学与工程学院, 福州 350108
    2.福州大学化肥催化剂国家工程研究中心糖生化研究所, 福州 350002
    3.泉州海关综合技术服务中心, 泉州 362000
  • 收稿日期:2020-09-09 出版日期:2021-06-10 发布日期:2021-06-08
  • 通讯作者: 魏峥 E-mail:zheng0wei@hotmail.com
  • 基金资助:
    福州大学科研启动项目(GXRC-20010)

Ultraviolet Absorbance of Saturated Structure in the Non-reducing End of Heparin/Heparan Sulfate Disaccharides and Its Application in Sequence of Heparin Oligosaccharides

LIANG Quntao1, ZOU Qiang3, LIN Jianghui2, LIU Shutao1, WEI Zheng2()   

  1. 1.College of Biological Science and Engineering,Fuzhou University,Fuzhou 350108,China
    2.Institute of Glycobiochemistry,National Engineering Research Centre of Chemical Fertilizer Catalyst,Fuzhou University 350002,China
    3.Comprehensive Technical Service Center of Quanzhou Customs,Quanzhou 362000,China
  • Received:2020-09-09 Online:2021-06-10 Published:2021-06-08
  • Contact: WEI Zheng E-mail:zheng0wei@hotmail.com
  • Supported by:
    the Faculty Research Startup Grant of Fuzhou University, China(GXRC?20010)

摘要:

为了进一步探讨非还原端饱和结构的肝素寡糖在UV 232 nm的吸收情况, 制备了4种饱和结构的肝素二糖, 并用离子对反相液相色谱/离子阱飞行时间质谱(RPIP-LC/MS-IT-TOF)光电二极管阵列检测器分析了它们在UV 232 nm的吸收情况. 分析结果表明, 饱和结构的肝素二糖在UV 232 nm的检出限为9 μg(S/N=10), UV 232 nm/UV 206 nm约为不饱和结构肝素二糖UV 232 nm的7%~40%. 结果还表明, 肝素二糖UV 232 nm的吸收强度受亚硫酸基团(SO32?)影响较大. 另外, 通过比较不饱和结构的肝素/硫酸类肝素(Hep/HS)标样二糖发现, 含N-未取代葡萄糖胺(GlcNH3+)基团的二糖在UV 232 nm的吸收值较低. 最后, 通过简单的UV检测方法, 结合 HNO2(pH=4.0)裂解法和RPIP-LC/MS-IT-TOF分析, 简化了含GlcNH3+肝素六糖的测序方法. 本研究为以后用 HNO2(pH=1.5)裂解法对混合组分N-硫酸化的肝素寡糖结构序列分析提供了可能.

关键词: 肝素, 饱和结构, 紫外吸收, 质谱, 测序

Abstract:

It is well known that the saturated structure in the non-reducing end(NRE) of heparin/heparan sulfate(HS) oligosaccharides is lacking ultraviolet(UV) 232 nm absorbance(normally used for specific detection of C4―C5 unsaturated oligosaccharides), which poses a significant challenge for structure analysis. However, we found that saturated heparin oligosaccharides can be detected at UV 232 nm with sufficient sensitivity in our previous research. In order to further study the UV 232 nm absorbance of the saturated structure, four saturated heparin disaccharides were prepared, and then their UV 232 nm absorptions were analyzed by ion-pair reversed-phase liquid chromatography ion-trap/time-of-flight mass spectrometry(RPIP-LC/MS-IT-TOF) with photodiode array detector. The results show that the saturated heparin disaccharides can be detected with sufficient sensitivity by absorbance at UV 232 nm, which still with 7%―40% of UV 232 nm intensity of heparin unsaturated disaccharides. It seems that the UV 232 nm intensity might be affected by the sulfate groups in the disaccharides. In addition, comparing to the common unsaturated heparin/HS disaccharides as references, the disaccharides with GlcNH3+ residues also showed less sensitivity at UV 232 nm. Finally, we simplified the sequencing method of the N-unsubstituted dp6 oligosaccharides by a simple UV detection method, combined with pH 4.0 HNO2 scission and RPIP-LC/MS-IT-TOF analysis. This strategy offers possibilities for sequencing at N-sulfated residues using alternative pH 1.5 HNO2 scission.

Key words: Heparin, Saturated structure, Ultraviolet absorption, Mass spectrometry, Sequencing

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