Synthesis and evaluation of novel 3-C-alkylated-Neu5Ac2en derivatives as probes of influenza virus sialidase 150-loop flexibility
作者:Santosh Rudrawar、Philip S. Kerry、Marie-Anne Rameix-Welti、Andrea Maggioni、Jeffrey C. Dyason、Faith J. Rose、Sylvie van der Werf、Robin J. Thomson、Nadia Naffakh、Rupert J. M. Russell、Mark von Itzstein
DOI:10.1039/c2ob25627d
日期:——
Novel 3-C-alkylated-Neu5Ac2en derivatives have been designed to target the expanded active site cavity of influenza virus sialidases with an open 150-loop, currently seen in X-ray crystal structures of influenza A virus group-1 (N1, N4, N5, N8), but not group-2 (N2, N9), sialidases. The compounds show selectivity for inhibition of H5N1 and pdm09 H1N1 sialidases over an N2 sialidase, providing evidence of the relative 150-loop flexibility of these sialidases. In a complex with N8 sialidase, the C3 substituent of 3-phenylally-Neu5Ac2en occupies the 150-cavity while the central ring and the remaining substituents bind the active site as seen for the unsubstituted template. This new class of inhibitors, which can ‘trap’ the open 150-loop form of the sialidase, should prove useful as probes of 150-loop flexibility.
我们设计了新型 3-C 烷基化-Neu5Ac2en 衍生物,用于靶向具有开放式 150 环的流感病毒表面糖苷酶的扩展活性位点空腔,目前在甲型流感病毒第 1 组(N1、N4、N5、N8)而非第 2 组(N2、N9)表面糖苷酶的 X 射线晶体结构中可以看到这种空腔。这些化合物对 H5N1 和 pdm09 H1N1 sialid 酶的抑制作用优于对 N2 sialid 酶的抑制作用,证明了这些 sialid 酶的 150 环具有相对的灵活性。在与 N8 sialid 酶的复合物中,3-phenylally-Neu5Ac2en 的 C3 取代基占据了 150 腔,而中心环和其余取代基则与未取代模板的活性位点结合。这一类新的抑制剂可以 "捕获 "开放的 150 环形式的硅糖苷酶,应被证明是 150 环灵活性的有用探针。