Identification of novel inhibitors of the streptogramin group A acetyltransferase via virtual screening
- VernacularTitle:应用虚拟筛选方法寻找链阳霉素A乙酰转移酶抑制剂
- Author:
Guangfeng WANG
;
Niu HUANG
;
Zhihong MENG
;
Quanhai LIU
- Publication Type:Journal Article
- Keywords:
streptogramin A;
virginiamycin acetyltransferase D;
virtual screening;
inhibitor design
- From:
Acta Pharmaceutica Sinica
2007;42(1):47-53
- CountryChina
- Language:Chinese
-
Abstract:
Virginiamycin acetyltransferase D (VatD) plays a vital rule in streptogramins resistance by chemically inactivating streptogramin A. Therefore, it is desirable to discover novel small molecular weight inhibitors of VatD via state-of-the-art virtual screening techniques. This "cocktail" strategy by combining VatD inhibitor with streptogramins may provide new therapeutic opportunity for resistant bacteria infections. Structure-based virtual screening method (molecular docking) was applied to rank and score a chemical database containing 300 000 commercially available compounds against the VatD substrate binding site. Twenty six out of the 200 top scored compounds from the docking calculation were selected and submitted to the VatD enzymatic inhibition assay. The plasmid pRSET B/vatD was constructed and transformed into E.coli (trxB) host cells for over-expression, and VatD enzyme was purified and validated by showing acetyltransferase activity to Virginiamycin M1. Three out of these 26 tested compounds showed enzymatic inhibition on VatD with IC50 168.6, 91.0 and 55.2 μmol·L-1, separately. Other compounds could not be dissolved in the system and/or had little effect on the enzyme (IC50>200 μmol·L-1). To our knowledge, it is first time that small molecular weight organic compounds were identified as VatD inhibitors. It is expected that the VatD inhibitors identified at present study could serve as lead compounds for the further development of the novel therapeutic agents to overcome streptogramins resistance.
