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.
A sulfanyl-PEG derivative of relaxin-like peptide utilizable for the conjugation with KLH and the antibody production
作者:Hidekazu Katayama、Masatoshi Mita
DOI:10.1016/j.bmc.2016.05.068
日期:2016.8
is generally used as an antigen for producing specific antibodies. However, preparation of a disulfide-rich heterodimeric peptide–KLH conjugates is difficult. In this study, we developed a novel method for preparation of the conjugate, and applied it to the production of specific antibodies against the relaxin-like gonad-stimulating peptide (RGP) from the starfish. In this method, a sulfanyl group
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
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.