The invention relates to a method for preparing a coupling product comprising the sequence Pq-Wv-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 represented by the formula Pq-Wv- His-X-Glu-(thio)ester; and (b) a peptide nucleophile having an N-terminally unprotected amine comprising a second peptide fragment comprising the sequence H-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 wherein - P represents a protective group at the N-terminal a-amino function of said peptide C-terminal ester or thioester and q is an integer having a value of 1 or 0; - W represents one or more amino acid residues, which may be the same or different and v is an integer having a value of 1 or more representing the number of amino acid residues W; - X is Ala or an α-amino-isobutyric acid unit (Aib); - Y is Lys, which Lys has a free side-chain ε-amino group or a side-chain ε-amino group that is protected with a protective group or a side-chain ε-amino group that is functionalised with an amino acid or another functional group; - Z is Arg or Lys.
该发明涉及一种制备偶联产物的方法,其包括序列Pq-Wv-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)包括由公式Pq-Wv-His-X-Glu-(
硫)酯代表的第一肽段的肽C-末端酯或
硫酯;以及(b)包括具有N-末端未保护胺基的肽亲核的第二肽段,其包括序列H-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,其中 - P代表所述肽C-末端酯或
硫酯的N-末端α-
氨基功能处的保护基,q是具有值为1或0的整数;- W代表一个或多个
氨基酸残基,可以相同也可以不同,v是具有值为1或更多的整数,表示
氨基酸残基W的数量;- X为Ala或α-
氨基
异丁酸单元(Aib);- Y为Lys,该Lys具有自由的侧链ε-
氨基基团或使用保护基保护的侧链ε-
氨基基团或使用
氨基酸或另一功能基团功能化的侧链ε-
氨基基团;- Z为Arg或Lys。