Amino Acids and Peptides. XVIII. Synthetic Peptides Related to N-Terminal Portion of Fibrin .ALPHA.-Chain and Their Inhibitory Effect on Fibrinogen/Thrombin Clotting.
Peptide analogs of the N-terminal portion of fibrin α-chain were prepared and their inhibitory effects on fibrinogen/thrombin clotting were examined. Of the synthetic peptides, H-Gly-Pro-Arg-Pro-Pro-NH2 exhibited the most potent inhibitory effect.
Amino Acids and Peptides. XX. Preparation of .BETA.-Cyclododecyl Aspartate and Its Application to Synthesis of Fibronectin- and Laminin-Related Peptides.
beta-Cyclododecyl aspartate was prepared and its application to peptidesynthesis was examined. Derivatives of beta-cyclododecyl aspartate are more likely to crystallize and should be useful for peptidesynthesis. The cyclododecyl ester was much stable to bases than the benzyl ester and rather more stable than the cyclohexyl ester. It was removable by HF treatment and trifluoromethanesulfonic acid treatment
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
The tripentacontapeptide corresponding to the entire linear sequence of epidermal growth factor was synthesized by assembling 15 peptide fragments and one His residue (position 22), followed by deprotection with trifluoromethanesulfonic acid-thioanisole in trifluoroacetic acid. The deprotected peptide was subjected to air-oxidation. After purification by ion-exchange chromatography on diethyl aminoethyl cellulose followed by high performance liquid chromatography, a peptide with powerful anti-gastric activity was obtained.