Structural basis for the broad-spectrum inhibition of metallo-β-lactamases by thiols
作者:Benoît M. R. Liénard、Gianpiero Garau、Louise Horsfall、Andreas I. Karsisiotis、Christian Damblon、Patricia Lassaux、Cyril Papamicael、Gordon C. K. Roberts、Moreno Galleni、Otto Dideberg、Jean-Marie Frère、Christopher J. Schofield
DOI:10.1039/b802311e
日期:——
The development of broad-spectrum metallo-β-lactamase (MBL) inhibitors is challenging due to structural diversity and differences in metal utilisation by these enzymes. Analysis of structural data, followed by non-denturing mass spectrometric analyses, identified thiols proposed to inhibit representative MBLs from all three sub-classes: B1, B2 and B3. Solution analyses led to the identification of broad spectrum inhibitors, including potent inhibitors of the CphA MBL (Aeromonas hydrophila). Structural studies revealed that, as observed for other B1 and B3 MBLs, inhibition of the L1 MBL thiols involves metal chelation. Evidence is reported that this is not the case for inhibition of the CphA enzyme by some thiols; the crystal structure of the CphAâZnâinhibitor complex reveals a binding mode in which the thiol does not interact with the zinc. The structural data enabled the design and the production of further more potent inhibitors. Overall the results suggest that the development of reasonably broad-spectrum MBL inhibitors should be possible.
由于金属δ-内酰胺酶(MBL)结构的多样性和这些酶对金属利用的差异,开发广谱金属δ-内酰胺酶(MBL)抑制剂具有挑战性。通过对结构数据进行分析,然后进行非定点质谱分析,确定了可抑制所有三个亚类中具有代表性的 MBL 的硫醇:B1、B2 和 B3。溶液分析确定了广谱抑制剂,包括对 CphA MBL(嗜水气单胞菌)的强效抑制剂。结构研究表明,正如在其他 B1 和 B3 MBL 中观察到的那样,L1 MBL 硫醇的抑制作用涉及金属螯合。有证据表明,某些硫醇对 CphA 酶的抑制作用并非如此;CphAâZnâ抑制剂复合物的晶体结构揭示了硫醇与锌不相互作用的结合模式。这些结构数据有助于设计和生产更多更有效的抑制剂。总之,研究结果表明,开发合理广谱的 MBL 抑制剂是有可能的。