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Title: Structure based virtual screening identifies small molecule effectors for the sialoglycan binding protein Hsa

Journal Article · · Biochemical Journal
DOI:https://doi.org/10.1042/bcj20200332· OSTI ID:1785206
 [1];  [2];  [3];  [3];  [4];  [3]; ORCiD logo [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of California, San Francisco, CA (United States)
  3. Vanderbilt Univ., Nashville, TN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Infective endocarditis (IE) is a cardiovascular disease often caused by bacteria of the viridans group of streptococci, which includes Streptococcus gordonii and Streptococcus sanguinis. Previous research has found that serine-rich repeat (SRR) proteins on the S. gordonii bacterial surface play a critical role in pathogenesis by facilitating bacterial attachment to sialylated glycans displayed on human platelets. Despite their important role in disease progression, there are currently no anti-adhesive drugs available on the market. Here, we performed structure-based virtual screening using an ensemble docking approach followed by consensus scoring to identify novel small molecule effectors against the sialoglycan binding domain of the SRR adhesin protein Hsa from the S. gordonii strain DL1. The screening successfully predicted nine compounds which were able to displace the native ligand (sialyl-T antigen) in an in vitro assay and bind competitively to Hsa. Furthermore, hierarchical clustering based on the MACCS fingerprints showed that eight of these small molecules do not share a common scaffold with the native ligand. This study indicates that SRR family of adhesin proteins can be inhibited by diverse small molecules and thus prevent the interaction of the protein with the sialoglycans. This opens new avenues for discovering potential drugs against IE.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1785206
Journal Information:
Biochemical Journal, Vol. 477, Issue 19; ISSN 0264-6021
Publisher:
Biochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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