Specific inhibitions of annonaceous acetogenins on class II 3-hydroxy-3-methylglutaryl coenzyme A reductase from Streptococcus pneumoniae.

3-Hydroxy-3-methylglutaryl coenzyme A reductase (class II HMGR) could serve as a potential target to discover drugs fighting against the invasive diseases originated from Streptococcus pneumoniae, one of the major causes of bacterial disease in human. However, no strongly effective inhibitors of class II HMGR have been found so far. In the present study, for the first time, four annonaceous acetogenins (ACGs) were explored for the inhibition on S. pneumoniae HMGR. The results showed that the ACGs had higher inhibitory activities against S. pneumoniae HMGR with K(i) values in the range of 6.45-20.49 μM than the statin drug lovastatin (K(i)=116.25 μM), a classical inhibitor of class I HMGR. Then, three-dimensional modeling and docking simulations analyzed the possible binding mode of ACGs to S. pneumoniae HMGR and suggested a kind of novel structural and binding mode for designing promising inhibitor candidates of the targeted enzyme S. pneumoniae II HMGR.

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