MLSCN

The Molecular Libraries Screening Center Network (MLSCN) Identifying Chemical Probes of Biological Systems... 

The NIH has set up a consortium called the Molecular Libraries Screening Center Network (MLSCN), which performs HTS on assays provided by the research community. It currently has more than 100,000 chemically diverse compounds. This is an initiative of the Molecular Libraries Roadmap, which also has another two components Cheminformatics and Technology Development. The aim is to generate a comprehensive database of chemical compounds and their bioactivities to enhance the capability for the development of new drug entities. 

An HTS campaign of 66,000 compounds using a luminescence-based assay was performed under the MLSCN... 

Huryn, D.M., Cosford, N.D.P. The Molecular Libraries Screening Center Network (MLSCN) Identifying chemical probes of biological systems. Ann. Rep. Med. Chem. 2007,42,401-16. 

PubChem archives the molecular structure and bioassay data from the MLSCN and other contributors. PubChem provides search, retrieval, and data analysis tools to optimize the utility of these results. PubChem further enhances the research utility of the MLSCN output by including other public sources of chemical structure and bioactivity information and by integration of this data with other NIH biomedical knowledgebases. The primary aim of PubChem is to provide a public on-line resource of comprehensive information on the biological activities of small molecules accessible to molecular biologists as well as computational and medicinal chemists. 

NIH Molecular Ubiiiries Screenir>g Centers Network [MLSCN]... 

Essential to this pilot phase was the creation of a chemical library the Molecular Libraries Small Molecule Repository, or MLSMR. This library, which is accessible by querying MLSMR in PubChem Substance, was subjected to MLSCN bioactivity screening between 2004 and 2008 for a total of 691 assays that were uploaded to PubChem. These included 242 primary, 402 confirmatory and 8 summary assays, which covered 171 targets and 29 phenotypic screens. These numbers continue to grow as pilot phase projects are completed. 

Chemical Probe 1.0 (2005). A probe is a chemical compound with activity in the primary and any secondary assays with adequate potency and aqueous solubility to be useful For in vitro (that is, cell-based) experimentation. The specifications For a probe are likely to vary depending on the target and may need to be set jointly by the assay provider and the MLSCN Steering Committee. An example of the specifications for a chemical probe that would define an endpoint for MLSCN activities would be expected potency of 1 pM and solubility in 1% DMSO. Source http //mli.nih.gov/mli/ wp-content/u ploads/data-shari ng-and-i p. pd f. 

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