A selective stepwise arylation of S−H and N−H bonds in unprotected peptides by air- and moisture- stable PtIV complexes is reported. These compounds showed high reactivity and selectivity toward the N terminal NH2 group over other N−H bonds in complex biologically relevant substrates.
Peptide synthesis catalyzed by modified .alpha.-chymotrypsin in low-water organic media
作者:H. Gaertner、T. Watanabe、J. V. Sinisterra、A. Puigserver
DOI:10.1021/jo00009a041
日期:1991.4
Enzyme-catalyzed synthesis of peptide bonds in organic solvents has been investigated by using alpha-chymotrypsin either modified with poly(ethylene glycol) or immobilized on different supports, in order to find out the importance of water content in the reaction. High yields of peptide synthesis were obtained whatever the type of enzyme derivative used. By varying the type of support, a modification in the enzyme environment was observed and resulted in a significant increase in the reaction yield when nucleophiles with poor affinity for the enzyme were used. Since organic solvents also affected substrate specificity with respect to the donor ester, a general methodology was proposed for the enzymatic synthesis of peptides in low-water organic media.
Novel Aminopeptidase N Inhibitors with Improved Antitumor Activities
作者:Qiang Wang、Qiao Shi、Lu Huang
DOI:10.2174/1570180812666150611190608
日期:2015.10.30
A series of aminopeptidase N (APN) inhibitors were designed and synthesized. Enzyme inhibitory,
docking and antiproliferative studies were performed to evaluate the derived molecules.
Molecule D15, with IC50 values of 10.9 μM, showed the best performance in the APN enzymatic inhibition
assay. The binding pattern of molecule D9 and D15 in the active site of APN was predicted by
docking studies. Hydrophobic and H-bond interactions were discovered to make key roles in the ligand-receptor bindings.
Compared with the previous C7, several molecules such as D9, D14 and D15, exhibited significantly improved activities
in inhibiting the growth of HL-60, ES-2, A549 and PLC cell lines.
Reactions of osmium tetraoxide with protein side chains and unsaturated lipids
作者:Alastair J. Nielson、William P. Griffith
DOI:10.1039/dt9790001084
日期:——
The reactions of OsO4 with derivatives or model systems (L) for the side chains of tissue proteins have been studied, alone and in the presence of unsaturated lipids (R). The following new complexes have been isolated and their structures studied by vibrational and 1H n.m.r. spectroscopy: Os2O6L4(L =α-N-benzoyl-L-histidine isobutyl ester, imidazole, 1-methylimidazole, 5,6-dimethylbenzimidazole, n-butylamine
已经研究了OsO 4与组织蛋白侧链的衍生物或模型系统(L)的反应,这些反应单独或在不饱和脂质(R)存在下进行。已分离出以下新的配合物,并通过振动和1 H nmr光谱研究了其结构:Os 2 O 6 L 4(L =α- N-N-苯甲酰基-L-组氨酸异丁酯,咪唑,1-甲基咪唑,5,6-二甲基苯并咪唑,正丁胺或α- N-苯甲酰基-DL-蛋氨酸); OsL 2(L =谷胱甘肽或L-半胱氨酸);混合物种Os 2 O 6 L3 L'(L = 1-甲基咪唑,L'=大号-脯氨酸甲酯或α- ñ -benzoyl-大号精氨酸乙酯)和OsLL' Ñ(L = 1-甲基咪唑,L'=α- ñ -苯甲酰-大号-半胱氨酸或α- ñ乙酰基大号-半胱氨酸); OsO 2(O 2 R)L 2(R =环己烯,油酸,油酸甲酯或乙酸胆固醇酯; L = 1-甲基-和5,6-二甲基苯并咪唑,α- N-苯甲酰基-L-组氨酸异丁酯或吡啶);Os