Bacterial Secretion Systems for Use in Biotechnology: Autotransporter-Based Cell Surface Display and Ultrahigh-Throughput Screening of Large Protein Libraries

In recent years, continuous progress was made in our understanding of bacterial secretion pathways and the application of protein secretion for biotechnology. Efficient protein export is a prerequisite for cost-effective downstream processing, and secretion of a protein of interest may also be useful for certain enzyme assays, for biotransformation reactions, and, in particular, for screening enzyme variants in libraries generated by directed evolution. Cells that display a particular enzyme variant can be exposed to a broad spectrum of different chemical environments, can sustain a broad pH range, and can therefore allow one to probe the desired target protein under defined conditions. In recent years, fluorescent-activated cell sorting (FACS) in combination with cell surface display has become a powerful tool for the activity-based ultrahigh-throughput screening of mutant proteins from large libraries. The below protocol provides the detailed description for the generation of protein libraries, E. coli cell surface display, and library screening using magnetic- and fluorescence-activated cell sorting technologies with an emphasis on activity and selectivity screening of lipases and esterases.
Source: Springer protocols feed by Microbiology - Category: Microbiology Source Type: news