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Genomic Approaches to Antibacterial Discovery

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This chapter describes two key strategies for the discovery of new antibacterial agents and illustrates the critical role played by genomics in each. The first approach is genomic target-based screening. Comparative genomics and bioinformatics are used to identify novel, selective antibacterial targets of the appropriate antibacterial spectrum. Genetic technologies integral for the success of this approach, such as essentiality testing, are also described. An unprecedented number of novel targets have been discovered via this approach, and a plethora of examples are discussed. This section concludes with the case history of a target successfully progressed from identification by genomics, to high-throughput screening, and onto proof of concept in curing experimental infections. The second approach is based on screening for compounds with antibacterial activity and then employing a broad variety of newer technologies to identify the molecular target of the antibacterial agent. The advantage of this approach is that compounds already possess antibacterial activity, which is a property often challenging to engineer into molecules obtained from enzyme-based screening approaches. The recent development of novel biochemical and genomic technologies that facilitate identification and characterization of the mode of action of these agents has made this approach as attractive as the genomic target-based screening strategy.
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