COX-2 metabolized the pentapeptide into small fragments consisting mainly of di- and tripeptides that ensured the safe breakdown of the peptide under in vivo conditions. The kinetic parameter Kcat/Km for COX-2-mediated metabolism of the peptide (6.3 × 105 M-1 s-1) was quite similar to 9.5 × 105 M-1 s-1 for arachidonic acid. Evidenced by the molecular dynamic studies and the use of Y385F COX-2, it was
除了通过酶抑制作用来作用抗炎剂的常规方式外,本文中还为COX-2提供了另一种底物。以脯
氨酸为中心的五肽与
花生四烯酸同构,其对COX-2具有明显的选择性,克服了
乙酸和
福尔马林引起的大鼠疼痛,几乎达到80%,被该酶作为底物处理。值得注意的是,COX-2将五肽代谢成主要由二肽和三肽组成的小片段,从而确保了该肽在体内条件下的安全分解。肽的COX-2介导的代谢动力学参数Kcat / Km(6.3×105 M-1 s-1)与
花生四烯酸的9.5×105 M-1 s-1非常相似。通过分子动力学研究和Y385F COX-2的使用证明,