Anticoagulant Peptides; Synthesis, Stability and Antithrombin Activity of Hirudin C-Terminal-Related Peptides and Their Disulfated Analog.
作者:Toru OKAYAMA、Ryo MURAMATSU、Sumie SEKI、Eriko NUKUI、Masaki HAGIWARA、Hideya HAYASHI、Tadanori MORIKAWA
DOI:10.1248/cpb.44.1344
日期:——
We designed a unique anticoagulant decapeptide, which possesses two O-sulfated tyrosine residues, based on the structure of hirudin's C-terminal functional domain. We first prepared a series of octa-, nona- and decapeptides with no sulfation, Suc-Phe-Glu-Pro-Ile-Pro-Glu-Tyr-Tyr-X-OH [X=bond, Leu or Leu-Gln], by a solution phase method and measured their thrombin times (TT) using human thrombin and rabbit plasma. The shortest octapeptide (3a) showed full antithrombin activity compareble to that of the lead compound hirudin (54-65), and the longest decapeptide (3c) prolonged TT most potently with an IC50 value of 5.8 μM. We consequently converted 3c to a disulfated decapeptide (NF-22) with SO3·pyridine complex and compared its antithrombin activity with that of known hirudin-related peptides : hirugen, MDL28050 and hirulog-1. NF-22 showed potent antithrombin activity with an IC50 value of 0.3 μM, being more potent than hirugen and MDL28050 (IC50 values of 4.0 μM and 1.1 μM, respectively). NF-22 was as potent as hirulog-1. NF-22 showed no change in activity in aqueous solution for 10 d at 60°C, and remained about 90% unchanged in rat plasma on incubation for 24 h at 37°C, whereas the corresponding unsulfated peptide (3c) was completely digested under the same condition. NF-22 appears to be one of the most potent and stable peptide anticoagulants among the hirudin analogs.
我们根据水蛭素C端功能域的结构设计了一种独特的抗凝血十肽,它具有两个O-硫酸化酪氨酸残基。我们首先制备了一系列未硫酸化的八肽、九肽和十肽,Suc-Phe-Glu-Pro-Ile-Pro-Glu-Tyr-Tyr-X-OH [X=键、Leu或Leu-Gln],通过溶液相法并使用人凝血酶和兔血浆测量它们的凝血酶时间(TT)。最短的八肽 (3a) 显示出与先导化合物水蛭素 (54-65) 相当的完整抗凝血酶活性,而最长的十肽 (3c) 最有效地延长 TT,IC50 值为 5.8 μM。因此,我们用 SO3·吡啶复合物将 3c 转化为二硫酸化十肽 (NF-22),并将其抗凝血酶活性与已知的水蛭素相关肽:hirugen、MDL28050 和 hirulog-1 进行比较。 NF-22 显示出有效的抗凝血酶活性,IC50 值为 0.3 μM,比 hirugen 和 MDL28050(IC50 值分别为 4.0 μM 和 1.1 μM)更有效。 NF-22 与 hirulog-1 一样有效。 NF-22 在 60°C 的水溶液中 10 天没有表现出活性变化,并且在 37°C 孵育 24 小时后在大鼠血浆中保持约 90% 的变化,而相应的非硫酸化肽 (3c) 在相同的条件。 NF-22 似乎是水蛭素类似物中最有效和最稳定的肽抗凝剂之一。