| abstract |
A novel peptide represented by the following general formula and a process for producing the same: X-A-Trp-B-Gly-Thr-E-G-Y wherein, A represents Asn or Asp; B represents His or Lys; E represents Ala or Ser; G represents Ala or Pro; X represents X¹-Gly or X³-Cys-X²; and Y represents hydroxy, lower alkoxy, amino, Y¹-Asp-Z or Y²-Cys-Z. The peptide is isolated from the product of culture of a streptomyces and has an endothelin antagonism and an activity of suppressing the rise of an intracellular calcium or cyclic guanosine-3,5-phosphate concentration caused by endothelin. |