Enzymatic process for producing immunomodulating pentapeptides and intermediates for use in the process
申请人:CARLBIOTECH LTD. A/S
公开号:EP0324659A2
公开(公告)日:1989-07-19
Synthesis of peptides
Ri-A-B-C-D-E-R2
wherein A, B, C, D and E represent amino acid residues coupled with peptide bonds and
A is a ω-amino-or ω-guanidino substituted basic L-or D-amino acid residue or a desamino derivative thereof,
B is a (o-amino- or ω-guanidino substituted basic L-amino acid residue, L-Pro or L-dehydroPro, preferably Asp or Glu, C is an acidic L- or D-amino acid residue, preferably Asp or Glu, D is an unpolar, hydrophobic aliphatic or aromatic aryl- or aralkyl group containing L-amino acid residue, preferably Val, lie or Leu,
E is an unpolar, hydrophobic aliphatic or aromatic aryl- or aralkyl group containing L- or D-amino acid residue or a decarboxy derivative thereof, preferably Tyr, Trp, Phe, His or Val, Ri is H or an a-amino substituting group, and R2 is OH or an a-carboxy substituting group, by sequential coupling of reactive derivatives of said amino acids and/or by fragment coupling of reactive oligopeptide derivatives on the basis of said amino acids.
At least one of these coupling reactions is carried out in a completely or partly aqueous medium at pH 3-12, in the presence of a proteolytic enzyme capable of catalyzing the formation of a peptide which, if desired, is coupled with a reactive amino acid derivative or peptide derivative in the presence of the same or another proteolytic enzyme, further enzymatic or chemical coupling reactions being carried out, if necessary.
The process, which is particularly suited for synthesizing the immunomodufating pentapeptides thymopentin and spleninopentin and their analogues, comprises several coupling strategies, the preferred enzymes for use in these strategies i.a. including thermolysin, trypsin, subtilisin, carboxypeptidase Y, elastase and bromelain.
The process i.a. uses the intermediates Z1ABOR, Z1ABC(OR')(OR") and Z1ABC(OR)OH, wherein Z1 has the same meaning as Ri, and R is alkyl or benzyl.
肽的合成
Ri-A-B-C-D-E-R2
其中 A、B、C、D 和 E 代表以肽键连接的氨基酸残基,并且
A 是被ω-氨基或ω-胍基取代的碱性 L-或 D-氨基酸残基或其去氨基衍生物、
B 是邻氨基或ω-胍基取代的碱性 L-氨基酸残基、L-Pro 或 L-脱氢 Pro,最好是 Asp 或 Glu, C 是酸性 L-或 D-氨基酸残基,最好是 Asp 或 Glu, D 是含有 L-氨基酸残基的非极性、疏水性脂肪族或芳香族芳基或芳烷基,最好是 Val、lie 或 Leu、
E是含有 L-或 D-氨基酸残基或其羧基衍生物的非极性、疏水性脂肪族或芳香族芳基或烷基,优选 Tyr、Trp、Phe、His 或 Val,Ri 是 H 或 a-氨基取代基,R2 是 OH 或 a-羧基取代基。
这些偶联反应中至少有一种是在 pH 值为 3-12 的完全或部分水性介质中,在能催化形成肽的蛋白水解酶存在下进行的,如果需要,可在相同或另一种蛋白水解酶存在下与活性氨基酸衍生物或肽衍生物偶联,必要时还可进行进一步的酶或化学偶联反应。
该工艺特别适用于合成免疫调节五肽胸腺五肽和脾脏五肽及其类似物,包括几种偶联策略,在这些策略中使用的首选酶包括热溶解酶、胰蛋白酶、枯草酶、羧肽酶 Y、弹性蛋白酶和菠萝蛋白酶。
工艺 i.a. 使用中间体 Z1ABOR、Z1ABC(OR')(OR") 和 Z1ABC(OR)OH,其中 Z1 的含义与 Ri 相同,R 是烷基或苄基。