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Compartmentalized Self-Replication for Evolution of a DNA Polymerase.
Current Protocols in Chemical Biology 2018 March
Compartmentalized self-replication (CSR) is an emulsion PCR-based method for the selection of DNA polymerases. E. coli host cells expressing a library of DNA polymerases are emulsified so that no more than a single cell is present in a single emulsion droplet. In a subsequent emulsion PCR step, the DNA polymerase protein, as well as the plasmid encoding it are released into the emulsion droplet and the genes that created the most active or abundant polymerase variants are exponentially amplified and can be passed to the next round of CSR. CSR is a powerful method for engineering of polymerases since it allows selection under a variety of conditions, including the use of non-standard substrates. In this unit, we provide a step-by-step procedure for the selection of polymerases, using as an example the selection of reverse transcriptase activity starting from a library of Thermococcus kodakaraensis (KOD) DNA polymerase variants. © 2018 by John Wiley & Sons, Inc.
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