The invention relates to a method for synthesising a peptide comprising the sequence His-X-Glu-Gly-Thr-Phe-Thr-Ser-Asp-Val-Ser-Ser-Tyr-Leu-Glu-Gly-Gln-Ala-Ala-Y-Glu-Phe-lle-Ala-Trp-Leu-Val-Z-Gly-Arg-Gly, comprising enzymatically coupling (a) a peptide C-terminal ester or thioester comprising a first peptide fragment comprising the sequence His-X- Glu-Gly-Thr-Phe-Thr-Ser-Asp-Val-Ser-(thio)ester; and (b) a peptide nudeophile having an N-terminally unprotected amine comprising a second peptide fragment comprising the sequence H-Ser-Tyr-Leu-Glu-Gly-Gln-Ala -Ala-Y-Glu-Phe-lle-Ala-Trp-Leu-Val-Z- Gly-Arg-Gly wherein - X is Ala or an α-amino-isobutyric acid (Aib) residue - Y is Lys, which Lys has a free side-chain ε-amino group or of which Lys the side-chain ε-amino group is protected with a protective group or of which Lys the side-chain ε-amino group is functionalised with an amino acid or another functional group - Z is Arg or Lys.
该发明涉及一种合成肽的方法,包括序列His-X-Glu-Gly-Thr-Phe-Thr-Ser-Asp-Val-Ser-Ser-Tyr-Leu-Glu-Gly-Gln-Ala-Ala-Y-Glu-Phe-Ile-Ala-Trp-Leu-Val-Z-Gly-Arg-Gly,包括酶催化偶联(a) 包含第一肽片段His-X-Glu-Gly-Thr-Phe-Thr-Ser-Asp-Val-Ser-(
硫)酯的肽C末端酯或
硫酯;和(b) 具有N-末端未保护胺基的肽亲核试剂,包括序列H-Ser-Tyr-Leu-Glu-Gly-Gln-Ala-Ala-Y-Glu-Phe-Ile-Ala-Trp-Leu-Val-Z-Gly-Arg-Gly,其中- X为Ala或α-
氨基
异丁酸(Aib)残基,- Y为Lys,该Lys具有自由侧链ε-
氨基基团或该Lys的侧链ε-
氨基基团被保护基保护或该Lys的侧链ε-
氨基基团被
氨基酸或其他功能基官能化,- Z为Arg或Lys。