Lamprey fibrinopeptide B is a relatively large peptide made up of about 40 amino acid residues. The peptide is highly electronegative, containing a large number of aspartic acid residues and a tyrosine O-sulphate residue. 2. The amino acid sequence of the first 18 residues from the N-terminal end of fibrinopeptide B has been established. The C-terminal ends with the sequence Val-Arg. Fibrino-peptide B is released by both lamprey and bovine thrombins. 3. Lamprey fibrino-peptide A is a short peptide containing only eight residues. The proposed amino acid sequence is: Asp-Asp-Ser-Ile/Leu-Asp-Ser-Leu/Ile-ArgThis peptide is released by lamprey thrombin but not by bovine thrombin.
摘要
七鳃鳗纤维蛋白肽B是一种相对较大的肽,由约40个氨基酸残基组成。该肽具有高度的负电性,含有大量天冬氨酸残基和一个酪氨酸O - 硫酸酯残基。2. 已经确定了纤维蛋白肽B从N端开始的前18个残基的氨基酸序列。C端序列为Val - Arg。七鳃鳗和牛凝血酶均可释放纤维蛋白肽B。3. 七鳃鳗纤维蛋白肽A是一种仅含8个残基的短肽。推测的氨基酸序列为:Asp - Asp - Ser - Ile/Leu - Asp - Ser - Leu/Ile - Arg。该肽由七鳃鳗凝血酶释放,但不由牛凝血酶释放。