The chemical synthesis of a bicycle inspired by the natural lasso peptide sungsanpin using a combination of solid‐phase and in‐solution chemistries is described. The bicyclic‐derived topoisomer was designed by introducing a covalent linkage between the ring and the loop, which allowed the tying of these two parts of the peptide, rendering the bicyclic structure. Several structural techniques, such
selectively cleaved by treatment with tetrazines via an inverse electron-demand Diels–Alder reaction. This represents a new orthogonal protecting group for solid-phasepeptidesynthesis, with Fmoc-Lys(VeZ)-OH as a versatile alternative to Fmoc-Lys(Alloc)-OH and Fmoc-Lys(Dde)-OH, as demonstrated by the synthesis of two biologically relevant cyclic peptides.
Chemical Synthesis of the β-Subunit of Human Luteinizing (hLH) and Chorionic Gonadotropin (hCG) Glycoprotein Hormones
作者:Alberto Fernández-Tejada、Paul A. Vadola、Samuel J. Danishefsky
DOI:10.1021/ja503545r
日期:2014.6.11
glycoforms due to limitations of biological methods in producing homogeneous samples of these glycoproteins. Using the powerful tools of chemicalsynthesis, the work presented herein focuses on the highly convergent syntheses of homogeneous β-hLH and β-hCG bearing model glycans at all native glycosylation sites. Key steps in these syntheses include a successful double Lansbury glycosylation en route to the
人黄体生成素 (hLH) 和人绒毛膜促性腺激素 (hCG) 是人糖蛋白激素,每个都由两个亚基组成,一个相同的 α 亚基和一个独特的 β 亚基,它们形成非共价异二聚体。在结构上,β-hCG 与 β-hLH 具有高度的序列相似性,包括在 N 端有一个共同的 N-糖基化位点,但主要区别在于存在一个延伸的 C 端部分,其中包含四个紧密间隔的 O-连接聚糖. 这些糖蛋白在生殖中起重要作用,并在临床上用于治疗不孕症。此外,hCG 作为肿瘤标志物在多种癌症中的作用也引起了癌症疫苗开发的极大兴趣。在临床应用中,由于生产这些糖蛋白均质样品的生物学方法的局限性,这些激素以糖型混合物的形式给药。使用强大的化学合成工具,本文介绍的工作重点是在所有天然糖基化位点上均质 β-hLH 和带有 β-hCG 的模型聚糖的高度收敛合成。这些合成中的关键步骤包括在通往 β-hCG N 末端片段的途中成功进行双 Lansbury
Enzyme-cleavable linkers for peptide and glycopeptide synthesis
作者:Beatrice A. Maltman、Mallesham Bejugam、Sabine L. Flitsch
DOI:10.1039/b506154g
日期:——
Hydroxymethylphenoxy linkers that are commonly used in solid phase peptide synthesis are surprisingly susceptible to efficient cleavage by the protease chymotrypsin with a broad range of amino acid residues being tolerated at the scissile bond; this enzyme-cleavable linker system has been applied to peptide and glycopeptide synthesis.