Traditionally, it is highly time consuming and expensive process to design ,development and launching of new drug. Natural process research is increasingly Being combined with computer aided drug design technique by the application of chemo informatics method ,we analyze (quantify ) chemical diversity and structural complexity and distribution in chemical space. During this period of new drug development involves around 10-15 yrs and invest high cost,This is done by various researchers and scientist from various field and discipline .The discovery of new drug from natural product are new strategic option in the field of new drug discovery and used as a lead for the further process. During the last decades a large number of biological active compound was screened out from the natural product as a new drug lead compound .The natural product as a new drug lead compound .the natural sources include Plant ,Animal ,Marine-organism ,mineral and micro –organism etc..
The application of Virtual screening method as an important tool in our quest to access novel drug like compounds. There are a large range of comparable and contrasting methodological protocols available in screening databases for the lead compounds. The number of methods and software packages which employ the target and ligand based virtual screening are increasing at a rapid rate. However, the general understanding on the applicability and limitations of these methodologies is not emerging as fast as the developments of various methods. Virtual screening uses computer based methods to discover new ligands on the basis of biological structures. Virtual screening is divided into structural based screening (docking) and screening using active compounds as templates (ligand based virtual screening). Ligand based screening techniques mainly focus on comparing molecular similarity analyses of compounds with known and unknown moiety, regardless of the methods of the used algorithm. Docking is a computational tool of structure based drug design to predict protein ligand interaction geometries and binding affinities. In this review we provide an overview of the already used ligand based virtual screening and the docking with various databases, filters, scores and applications in the recent research in the pharmaceutical field.
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