Peptidomimetic Inhibitors of the Human Cytomegalovirus Protease
摘要:
The development of peptidomimetic inhibitors of the human cytomegalovirus (HCMV) :protease showing sub-micromolar potency in an enzymatic assay is described. Selective substitution of the amino acid residues of these inhibitors led to the identification of tripeptide inhibitors showing improvements in inhibitor potency cf 27-fold relative to inhibitor 39 based upon the natural tetrapeptide sequence. Small side chains at P-1 were well tolerated by this enzyme, a fact consistent with previous observations. The S-2 binding pocket of HCMV protease was very permissive, tolerating lipophilic and basic residues. The substitutions tried at P-3 indicated that a small increase in inhibitor potency could be realized by the substitution of a tert-leucine residue for valine. Substitutions of the N-terminal capping group did not significantly affect inhibitor potency. Pentafluoroethyl ketones, alpha,alpha-difluoro-beta-keto amides, phosphonates and a-keto amides were all effective substitutions for the activated carbonyl component and gave inhibitors which were selective for HCMV protease. A slight increase in potency was observed by lengthening the P-1' residue of the alpha-keto amide series of inhibitors. This position also tolerated a variety of groups making this a potential site for future modifications which could modulate the physicochemical properties of these molecules.
new family of uronium salts (HTMU, HMMU, and HDmPyMU) based on isonitroso Meldrum's acid (HONM) are reported as stand-alone couplingreagents. Amide bond formation with the use of these reagents occurred more quickly than that with other uronium salts as a result of the presence of a neighboring group effect with a cyclic structure. Thus, these novel onium salts were often moreeffective in the acylation
Application of 2,2′‐dipyridyl disulfide‐mediated thiazolidine ring‐opening reaction to glycoprotein synthesis: Total chemical synthesis of evasin‐3
作者:Hidekazu Katayama、Koji Nagata
DOI:10.1002/psc.3290
日期:2021.2
Thiazolidine ring‐openingreaction is one of the key steps in protein chemical synthesis via sequential native chemical ligation strategy. We recently developed a novel thiazolidine ring‐openingreaction with 2,2′‐dipyridyl disulfide (DPDS). In order to investigate the applicability of this reaction to glycoprotein synthesis, we synthesized evasin‐3, a cysteine‐rich glycoprotein with chemokine‐binding
噻唑烷开环反应是通过顺序天然化学连接策略进行蛋白质化学合成的关键步骤之一。我们最近开发了一种新的噻唑烷与 2,2'-二吡啶基二硫化物 (DPDS) 的开环反应。为了研究该反应对糖蛋白合成的适用性,我们合成了 evasin-3,这是一种富含半胱氨酸的糖蛋白,具有最初在蜱唾液中发现的趋化因子结合能力。evasin-3的序列分为三个片段,这些片段分别用普通固相肽合成方法合成。在第一次连接中间和 C 端片段后,用作中间片段 N 端 Cys 残基保护基的噻唑烷用 DPDS 转化为 Cys。在这个噻唑烷开环反应中,N-连接的聚糖部分。在与 N 端片段的第二次连接和重折叠反应后,可以以良好的收率获得 evasin-3。合成的 evasin-3 显示出对 CXCL 趋化因子的特异性结合能力。这些结果清楚地表明这种 DPDS 方法可用于糖蛋白合成。
Unwanted hydrolysis or α/β-peptide bond formation: how long should the rate-limiting coupling step take?
branched aminoacids (Ile, Thr) with slowly hydrolyzing (6 < t < 24 h) propensities, and (iii) non-hydrolyzing ones, such as the hard-to-couple β-amino acids or β-sugar aminoacidderivatives, stable for longer times (t > 24 h) in solution. The current insight into the kinetics of this key hydrolysis side reaction serves as a guide to optimize the coupling conditions of α- and β-amino acids, thereby
Fluorine and Rhenium Substituted Ghrelin Analogues as Potential Imaging Probes for the Growth Hormone Secretagogue Receptor
作者:Dina Rosita、Matthew A. DeWit、Leonard G. Luyt
DOI:10.1021/jm8014519
日期:2009.4.23
prepared containing rhenium, as a surrogate metal for technetium-99m, with a cyclopentadienylrhenium tricarbonyl being situated at the terminus of the residue-3 side chain, yielding compounds the best of which had a 35 nM IC50. This represents a rare case of incorporating rhenium into a peptide structure where the metal complex is required for biological activity. These fluorine and rhenium derivatives demonstrate
在努力创建针对生长激素促分泌素受体(GHSR)的成像探针的过程中,我们现在报告了通过修饰正辛酰基Ser-3侧链设计和合成含氟和rh的生长素释放肽类似物的过程。使用二氨基丙酸(Dpr)作为残基-3,设计了氟类似物,使氟原子位于脂族链的末端。制备了截短的ghrelin(1-5)和ghrelin(1-14)含氟类似物,其中最好的类似物具有用于GHSR的28 nM IC 50。还制备了Ghrelin(1-14)类似物,其中含有rh,作为m 99m的替代金属,三羰基环戊二烯基r位于残基3侧链的末端,产生的化合物中最好的是35 nM IC50。这代表了将rh掺入肽结构的罕见情况,其中金属配合物是生物活性所必需的。这些氟和rh衍生物表现出修饰ghrelin的Ser-3侧链的能力,以便为GHSR创建成像探针。
Chemo-Enzymatic Synthesis of Fmoc-Peptide Fragments
作者:Shui-Tein Chen、Shu-Chyong Hsiao、Chung-Ho Chang、Kung-Tsung Wang
DOI:10.1080/00397919208055416
日期:1992.1
Optically pure Fmoc-peptide fragments have been prepared via dicyclohexylcarbodiimide coupling of N-protected amino acids with amino acid esters, followed by enzyme-catalyzed ester hydrolysis by alcalase with a high concentration of organic solvent in a high yield.