Sialic acid C-glycosides with aromatic residues: Investigating enzyme binding and inhibition of Trypanosoma cruzi trans-sialidase
作者:Sebastian Meinke、Andreas Schroven、Joachim Thiem
DOI:10.1039/c0ob01176b
日期:——
Several α-configured C-sialosides were synthesised by cross metathesis and further synthetic derivatisation to obtain ligands for Trypanosoma cruzi trans-sialidase (TcTS), a key enzyme in Chagas disease. Affinities of these compounds to immobilised TcTS were measured by surface plasmon resonance (SPR). The KD values thus obtained are in the lower millimolar range and will be discussed. The results show the importance of addressing Tyr119 and Trp312 side chains of TcTS in target oriented ligand synthesis, since these amino acids constitute the acceptor binding region in the active site of TcTS. The best ligand showed a significant decrease of TcTS activity in a preliminary NMR based inhibition assay.
通过交叉复分解及进一步的衍生化合成,得到了几种α构型的C-唾液酸苷,作为锥虫锥体变形虫(Trypanosoma cruzi)的转运唾液酸酶(TcTS)的配体,TcTS是查加斯病中的关键酶。我们利用表面等离子共振(SPR)技术测定了这些化合物与固定化TcTS间的亲和力,所得到的KD值处于较低的毫摩尔范围内,将进行讨论。结果显示,在以靶点为导向的配体合成中,考虑到TcTS的酪氨酸119和色氨酸312侧链的重要性,因为这些氨基酸构成了TcTS活性位点的受体结合区域。在基于核磁共振的初步抑制试验中,最佳配体显著降低了TcTS的活性。