Peptide Synthesis in Aqueous Solution. II. Synthesis and Biological Activity of a Molluscan Neuropeptide, FMRFamide (Phe–Met–Arg–Phe–NH<sub>2</sub>) Analogs for N-Terminal Moiety
In order to elucidate the contribution of the N-terminal moiety (Phe1 or Met2) of FMRFamide to the activity, 16 kinds of FMRFamide analogs were synthesized and their structure-activity relations are discussed. From the results, it was found that hydrophobic or bulky group in N-terminal contributes to the contractile effect, while the precise length of the side chain of amino acid at 2-position is due
found to be an excellent coupling reagent having a water-soluble property and a high reactivity; it worked as satisfactory as usual activeesters in regard to the reactivity, product purity, and racemization. The marked advantage of the HODMSP·MeSO4− activeester method was the fact that bifunctional residues such as Arg, Lys, Cys, and Tyr could be selectively acylated when the pH of the reaction mixture
Peptide Synthesis in Aqueous Solution. III. Synthesis and Biological Activity of Cyclohexylamide Derivatives of Peptides Related to a Molluscan Neuropeptide, FMRFamide (Phe–Met–Arg–Phe–NH<sub>2</sub>)
C-terminal Phe4–NH2 of FMRFamide (Phe–Met–Arg–Phe–NH2) to the biologicalactivity, 30 kinds of cyclohexylamide derivatives of peptides related to FMRFamide were synthesized and their FMRFamide-like activity was measured. From the results, it was found that the peptide which was placed at C-terminal Phe4–NH2 by D-Ala–CHA showed only a relaxing activity. Furthermore, it was recognized that Met–Arg–Asp–diCHA
The hydrolysis (deacylation) of enantiomeric substrates by the chemically modified enzymes decanoyl-alpha-chymotrypsin and decanoyl-trypsin was studied. Reaction activity for decanoyl-alpha-chymotrypsin was lower than that for the native enzyme, although intriguingly the enantioselectivity was markedly enhanced as compared with the native enzyme. In particular, the apparently complete enantioselective
The onium salt of the present invention contains predetermined compound A represented by the general formula (1). The composition of the present invention contains the onium salt of the present invention, and an onium salt containing predetermined compound B represented by the general formula (2). The onium salt and the composition of the present invention exert well-balanced excellent physical properties in terms of cold curing properties, storage stability, thermal shock resistance after curing, and moisture resistance.