Toward the chemoenzymatic synthesis of heparan sulfate oligosaccharides: oxidative cleavage of p-nitrophenyl group with ceric ammonium salts
作者:Chao Cai、Lingyun Li、Cate Harvey、Jian Liu、Robert J. Linhardt
DOI:10.1016/j.tetlet.2013.06.044
日期:2013.8
We have developed an efficient chemoenzymatic synthesis of heparan sulfate oligosaccharides employing the para-nitrophenyl (p-NP) β-glucuronide as an acceptor compatible with enzymatic elongation and one that significantly simplifies oligosaccharide purification on C-18 resin. Employing ceric ammonium nitrate as oxidative reagent to remove the p-NP group unexpectedly also removed the glucuronic acid
我们开发了一种高效的硫酸乙酰肝素寡糖化学酶法合成方法,采用对硝基苯基( p -NP) β-葡萄糖醛酸作为与酶促延伸相容的受体,并且显着简化了 C-18 树脂上寡糖的纯化。使用硝酸高铈铵作为氧化剂去除p -NP基团出乎意料地也去除了还原端的葡萄糖醛酸残基,得到更小的寡糖。硫酸高铈铵的应用可以去除p -NP,而不会同时损失相邻的葡萄糖醛酸,从而为更长的硫酸肝素寡糖产品提供了一条途径。
Facile chemoenzymatic synthesis of unmodified anticoagulant ultra-low molecular weight heparin
作者:Guijiao Zhang、Kaihua Yang、Lin Wang、Yanzhen Cheng、Chunhui Liu
DOI:10.1039/d2ob01221a
日期:——
A chemoenzymatic approach, mimicking the biosynthetic pathway of heparin and heparan sulfate (HS), has been well developed to prepare a series of structurally well-defined heparin oligosaccharides with excellent anticoagulant activity in good overall yields. The current chemoenzymaticsynthesis typically begins with an unnatural glycosyl acceptor, p-nitrophenyl glucuronide (GlcA-PNP), which is convenient
模仿肝素和硫酸乙酰肝素 (HS) 生物合成途径的化学酶法已得到很好的开发,可制备一系列结构明确的肝素寡糖,具有优异的抗凝活性,总产率高。目前的化学酶促合成通常以非天然糖基受体对硝基苯基葡萄糖醛酸苷 (GlcA-PNP) 开始,尽管它提供了具有不良结构特征的肝素分子,但它便于检测回收和纯化。在此,我们描述了一种简便的化学酶促策略,该策略由肝素酶 III 的特异性裂解辅助,用于高效合成未修饰的肝素七糖,该肝素七糖在体外表现出强大的抗凝血活性以及与磺达肝素相称的药代动力学特征。这种成功的通用策略适用于具有完全天然结构特征的多种 HS/肝素分子的可扩展合成,作为有前途的治疗剂。