Cysteine/Penicillamine Ligation Independent of Terminal Steric Demands for Chemical Protein Synthesis
作者:Yi Tan、Jiasheng Li、Kang Jin、Jiamei Liu、Ziyong Chen、Jun Yang、Xuechen Li
DOI:10.1002/anie.202003652
日期:2020.7.27
The chemicalligation of two unprotected peptides to generate a natural peptidic linkage specifically at the C‐ and N‐termini is a desirable goal in chemicalproteinsynthesis but is challenging because it demands high reactivity and selectivity (chemo‐, regio‐, and stereoselectivity). We report an operationally simple and highly effective chemicalpeptideligation involving the ligation of peptides
Probing the Frontiers of Glycoprotein Synthesis: The Fully Elaborated β-Subunit of the Human Follicle-Stimulating Hormone
作者:Pavel Nagorny、Neeraj Sane、Bernhard Fasching、Baptiste Aussedat、Samuel J. Danishefsky
DOI:10.1002/anie.201107482
日期:2012.1.23
β‐subunit of the human follicle‐stimulating hormone (hFSH) displaying a N‐linked consensus sequence oligosaccharide at each of the two wild‐type sites was synthesized. The glycoprotein has been designed with acetamidomethyl protected cysteine residues, anticipating folding and association with the α‐subunit. This represents the largest realistically glycosylated homogeneous glycoprotein obtained by using
雄心勃勃的任务:合成了在两个野生型位点上显示 N 连接共有序列寡糖的人卵泡刺激素 (hFSH) 的 β 亚基。该糖蛋白被设计为具有乙酰氨基甲基保护的半胱氨酸残基,预期折叠并与 α 亚基结合。这代表了通过严格使用化学方法获得的最大的实际糖基化均质糖蛋白。
Solid-phase Synthesis of 2,3,5-Triketopiperadine
作者:Shingo Makino、Eiji Nakanishi、Takashi Tsuji
DOI:10.1055/s-2003-38757
日期:——
The synthesis of 2,3,5-triketopiperadines on solid-support has been achieved for the first time. Cyclization of 4 using oxalyl diimidazole proceeded excellently with N-methyl amino acids except for Sarcosine (Sar). On the other hand, this cyclization did not proceed well when amino acids without N-methyl substitution were used. This can be explained by the lower energy difference between the trans and cis configurations of oxalyl amide 5 by the introduction of N-methyl substitution, because cis conformation is necessary for the cyclization to proceed. This cyclization also worked well with amino acids with a six-membered ring such as tetrahydroisoquinoline-3-carboxylic acid (Tic) and piperidine-2-carboxylic acid (Pic), which are N-alkylated amino acids. Although the purity of the target compounds was found to be low in the case of Sar and amino acids with a five-membered ring such as proline (Pro) and thiazolidine-4-carboxylic acid (Thz) under the same cyclization conditions, we were able to successfully optimize the reaction conditions to give the target compounds with good purity. Furthermore, it was demonstrated that 2,3,5-triketopiperadines with three points diversity could be prepared on solid-support with high purity, showing the generality of this method.
be deprotected with concomitant formation of a disulphide bond connecting the two Cys residues. A mechanistic study on the disulphide formation led to a general protocol for deprotection of the S-Acm group by CuSO4 and a 1,2-aminothiol under aerobic conditions. Application of this new deprotection reaction allowed for the synthesis of Apamin, a peptide with two-disulphides in a one-pot/stepwise disulphide-bridging
Selection of DNA‐Encoded Dynamic Chemical Libraries for Direct Inhibitor Discovery
作者:Yuqing Deng、Jianzhao Peng、Feng Xiong、Yinan Song、Yu Zhou、Jianfu Zhang、Fong Sang Lam、Chao Xie、Wenyin Shen、Yiran Huang、Ling Meng、Xiaoyu Li
DOI:10.1002/anie.202005070
日期:2020.8.24
that can identify full ligand structures from large‐scale DEDLs. This method is also able to convert unbiased libraries into focused ones targeting specific protein classes. We demonstrated this method by selecting DEDLs against five proteins, and novel inhibitors were identified for all targets. Notably, several selective BD1/BD2 inhibitors were identified from the selections against bromodomain 4 (BRD4)