This invention relates to a method for producing an LH-RH derivative, characterized in that a peptide fragment shown by general formula (1): pGlu-His-Trp-OR1 (where R1 denotes a lower alkyl) and a peptide fragment shown by general formula (2): H-Ser-Tyr-X-Leu-Arg-Pro-Y (where X denotes an amino acid selected from the group consisting of D-amino acids such as D-Leu, D-Ser(But), D-Trp, and (2-napthyl)-D-Ala, and Gly, and Y denotes Gly-NH2, Azgly(Azaglycine)-NH2 or NHR2 (R2 is lower alkyl)) are allowed to react in the presence of chymotrypsin or a chymotrypsin-like enzymes, to produce the LH-RH derivative shown by general formula (3): pGlu-His-Trp-Ser-Tyr-X-Leu-Arg-Pro-Y (where X and Y are as defined above). Since the method does not accompany a side reaction such as racemization, it enables simple separation and purification of LH-RH derivatives. Moreover the method enables to provide high yields, as well as recovery and recycling of unreacted peptide fragments, therefore it is valuable in industrial use.
本发明涉及一种生产LH-RH衍
生物的方法,其特征在于在胰
蛋白酶或类胰
蛋白酶的存在下,让一般式(1)所示的肽片段:pGlu-His-Trp-OR1(其中R1表示低碳基)和一般式(2)所示的肽片段:H-Ser-Tyr-X-Leu-Arg-Pro-Y(其中X表示从D-
氨基酸中选择的
氨基酸,例如D-Leu、D-Ser(But)、D-Trp和(2-
萘基)-D-Ala,以及Gly,Y表示Gly-NH2、Azgly(Azaglycine)-NH2或NHR2(其中R2是低碳基))反应,以产生一般式(3)所示的LH-RH衍
生物:pGlu-His-Trp-Ser-Tyr-X-Leu-Arg-Pro-Y(其中X和Y如上所定义)。由于该方法不伴随着类似于旋光异构化的副反应,因此可以简单地分离和纯化LH-RH衍
生物。此外,该方法能够提供高产率,并回收和再利用未反应的肽片段,因此在工业用途上具有重要价值。