Carboxamidomethyl esters (CAM esters) as carboxyl protecting groups.
作者:Jean Martinez、Jeanine Laur、Bertrand Castro
DOI:10.1016/s0040-4039(00)88401-4
日期:1983.1
The carboxamidomethyl esters (CAM esters) are proposed for carboxyl protection in peptide synthesis. Amino acid CAM ester derivatives were easily prepared and showed good stability in the deblocking conditions of other common protectinggroups used in peptide synthesis. The CAM esters were selectively and rapidly hydrolyzed in an alcaline medium.
Development of a Hypusine Reagent for Peptide Synthesis
作者:Raymond J. Bergeron、Christian Ludin、Ralf Müller、Richard E. Smith、Phanstiel
DOI:10.1021/jo970119z
日期:1997.5.1
The synthesis of a reagent that enables the incorporation of the unusual amino acid (2S,9R)hypusine (Hpu) into peptide sequences is described. The reagent, (2S,SR)-11-[(benzyloxycarbonyl)amino]-7-(carbobenzyloxy)-2- [(9-fluorenylmethoxycarbonyl)amino]-9-(tetrahydropyran-2-yloxy)- 7-azaundecanoic acid, is utilized in the synthesis of a hexapeptide containing the primary pentapeptide sequence of the eukaryotic initiation factor eIF-5A, L-Cys-L-Thr-Gly-Hpu-L-His-Gly. The reagent is shown to be effective for both solution phase and Merrifield resin synthesis.
Synthesis and biological activity of new peptide segments of gastrin exhibiting gastrin antagonist property
作者:Jean Martinez、Richard Magous、Marie Francoise Lignon、Jeanine Laur、Bertrand Castro、Jean Pierre Bali
DOI:10.1021/jm00378a012
日期:1984.12
A series of C-terminal peptide segments of gastrin, i.e., (tert-butyloxycarbonyl)-L-tryptophyl-L-methionyl-L-aspartic acid amide, (tert-butyloxycarbonyl)-glycyl-L-tryptophyl-L-methionyl-L-aspartic acid amide, (tert-butyloxy-carbonyl)-L-tyrosyl-glycyl-L-tryptophyl-L-methionyl-L-asp artic acid amide, and (benzyloxycarbonyl)-L-glutamyl-L-alanyl-L-tyrosyl-glycyl-L-tryptophyl-L -methionyl-L-aspartic acid amide were prepared and were shown to competitively inhibit the binding of labeled human gastrin to its receptors in an isolated gastric mucosal cell preparation and to antagonize the action of gastrin on gastric acid secretion (ED50 from 1.5 to 7 mg/kg) in vivo in the reperfused rat stomach, determined according to the method of Ghosh and Schild. From these studies, it could be concluded that the C-terminal phenylalanine residue, which is of primary importance for intrinsic biological gastrin-like activity, is not essential for binding to gastrin receptors.
On the use of carboxamidomethyl esters (cam esters) in the synthesis of model peptides. scope and limitations
作者:Jean Martinez、Janine Laur、Bertrand Castro
DOI:10.1016/s0040-4020(01)96451-8
日期:1985.1
protecting group for peptide synthesis was demonstrated. The synthesis of the chemotactic peptide For-Met-Leu-Phe-OH as well as the synthesis of Met-enkephalin using CAM ester as carboxyl terminal protection were performed. These esters showed good stability during acidolytic removal of BOC N-protecting group, during hydrogenolysis of Z N-protecting group and during removal of FMOC N-protecting group. CAM
证明了羧酰胺基甲基酯(CAM酯)作为用于肽合成的羧基保护基的用途。进行了趋化肽For-Met-Leu-Phe-OH的合成以及使用CAM酯作为羧基末端保护的Met-脑啡肽的合成。这些酯在酸解去除BOC N-保护基期间,Z N-保护基的氢解期间和FMOC N-保护基的去除期间显示出良好的稳定性。CAM酯可被NaOH 0.5 N或Na 2 CO 3迅速裂解。但是,当序列中存在天冬氨酸的β-苄基酯时,我们未能成功地选择性除去CAM酯。
Enhancement in the rate of conversion of peptide Cys-Pro esters to peptide thioesters by structural modification
We previously reported that the peptide containing a Cys-Pro ester (CPE) moiety is spontaneously transformed into a peptidethioestervia an N to S acyl shift followed by diketopiperazine formation. In an attempt to identify more reactive structures for the formation of a peptidethioester, we modified the CPE structure, in which the Pro residue in the CPE moiety was replaced with N-substituted glycine