on the passive membranepermeability by means of parallel artificial membranepermeability assay (PAMPA). Photoreaction of peptides containing one or two NB groups proceeded cleanly in moderate to high yields, releasing the unprotected parent linear peptide. The NB-modified peptides showed a cis/trans conformational equilibrium, while after photolysis, the unprotected linear peptides showed only the
在这项研究中,我们通过实验和计算研究探索了光可去除的硝基苯甲基(NB)基团作为操纵膜渗透性和调节线性肽构象的工具的潜力。我们发现,与相应的未修饰肽相比,引入一个或多个 NB 基团显着增加了渗透性并改变了构象。我们通过平行人工膜通透性测定(PAMPA)彻底研究了肽长度、NB基团数量NB插入位置以及N端和C端保护基团的引入对被动膜通透性的影响。含有一个或两个 NB 基团的肽的光反应以中等到高产率干净地进行,释放出未受保护的母体线性肽。 NB修饰的肽表现出顺/反构象平衡,而光解后,未保护的线性肽仅表现出α-酰胺构象。此外,对NB修饰肽和甲基化肽进行了全面比较,包括构象分析和理化性质。 -取代的肽有利于折叠状结构,这可能有助于改善渗透性。
Amino Acids and Peptides. XXXIV. Synthesis of Mouse Metallothionein I.(1). Synthesis of Dotriacontapeptide Corresponding to C-Terminal Sequence 30-61 (.ALPHA.-Fragment) of Mouse Metallothionein I and Related Peptides and Examination of Their Heavy Metal-Binding Properties.
The dotriacontapeptide corresponding to the C-terminal sequence of mouse metallothionein (MT) I and related peptides which contain Cys-X-Cys-Cys (X : amino acid residue except for Cys) sequence were synthesized by the conventional solution method employing the HF deprotection method and their heavy metals (Cd2+, Cu2+ and Cu+)-binding properties were examined.
合成了对应于小鼠金属硫蛋白 (MT) I C末端序列的三十二肽及相关肽,这些肽包含Cys-X-Cys-Cys(X:除Cys外的氨基酸残基)序列,采用传统溶液法结合HF去保护法,并对它们与重金属(Cd2+、Cu2+和Cu+)的结合特性进行了研究。
Reaction of [(Cp2TiCH3)(THF)+][BPh4] with Tripeptide Derivatives: Formation of Cationic (Peptide)titanocene Complexes
tripeptide methyl esters [Z-/Boc-5 to -12(pept)] was prepared using the amino acids glycine, alanine and valine. In both the alanine and the valine series a single glycine unit was introduced and its position inside the tripeptide framework was systematically varied. Reaction of these 16 tripeptide derivatives with the organometallic reagent [Cp2TiCH3(THF)+][BPh4−] (13) resulted in the formation of