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We have performed FlexX docking experiments to predict the best docking poses of 5-androst-16-en-3-ol or 5-androst-16-en-3-one to Boar salivary lipocalin (SAL). Since no steroids were found inside of the binding pocket of the X-ray structure of 1GM6, we tried to find docking structures after opening the pocket using the random tweak option implemented in SYBYL. This operation allowed the ligand to enter the pocket. The best poses generated from FlexX were different from the structures reported earlier, which calculated docking poses by manual docking followed by minimization. Analysis of docking poses allowed us to identify pharmacophores. From this information, virtual screening experiments using UNITY were performed. Among six candidates, 3-(3,7-dimethyloct-6-enylamino)propane-1,2-diol (Leadquest code name: 5755) was chosen for further development. Future work will involve synthesis of some derivatives of 5755 and biological experiments if any derivatives can control the biostimulation and improve reproductive efficiency in pigs.

Docking and Virtual Screening Studies for New Leads of Boar Salivary Lipocalin