Cyclobutanone Mimics of Intermediates in Metallo-β-Lactamase Catalysis.

Cyclobutanone Mimics of Intermediates in Metallo-β-Lactamase Catalysis.
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DOI:
10.1002/chem.201705886
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发表时间:
2018-04-17
期刊:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
--
通讯作者:
Dmitrienko GI
Dmitrienko GI
中科院分区:
其他
文献类型:
--
作者:
Abboud MI;Kosmopoulou M;Krismanich AP;Johnson JW;Hinchliffe P;Brem J;Claridge TDW;Spencer J;Schofield CJ;Dmitrienko GI

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The most important resistance mechanism to β‐lactam antibiotics involves hydrolysis by two β‐lactamase categories: the nucleophilic serine and the metallo‐β‐lactamases (SBLs and MBLs, respectively). Cyclobutanones are hydrolytically stable β‐lactam analogues with potential to inhibit both SBLs and MBLs. We describe solution and crystallographic studies on the interaction of a cyclobutanone penem analogue with the clinically important MBL SPM‐1. NMR experiments using 19F‐labeled SPM‐1 imply the cyclobutanone binds to SPM‐1 with micromolar affinity. A crystal structure of the SPM‐1:cyclobutanone complex reveals binding of the hydrated cyclobutanone through interactions with one of the zinc ions, stabilisation of the hydrate by hydrogen bonding to zinc‐bound water, and hydrophobic contacts with aromatic residues. NMR analyses using a 13C‐labeled cyclobutanone support assignment of the bound species as the hydrated ketone. The results inform on how MBLs bind substrates and stabilize tetrahedral intermediates. They support further investigations on the use of transition‐state and/or intermediate analogues as inhibitors of all β‐lactamase classes.
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