Bacterial cell-free system for high-throughput protein expression and a comparative analysis of Escherichia coli cell-free and whole cell expression systems

Protein Expression and Purification
T V S MurthyLeonardo Brizuela

Abstract

Sixty-three proteins of Pseudomonas aeruginosa in the size range of 18-159 kDa were tested for expression in a bacterial cell-free system. Fifty-one of the 63 proteins could be expressed and partially purified under denaturing conditions. Most of the expressed proteins showed yields greater than 500 ng after a single affinity purification step from 50 microl in vitro protein synthesis reactions. The in vitro protein expression plus purification in a 96-well format and analysis of the proteins by SDS-PAGE were performed by one person in 4 h. A comparison of in vitro and in vivo expression suggests that despite lower yields and less pure protein preparations, bacterial in vitro protein expression coupled with single-step affinity purification offers a rapid, efficient alternative for the high-throughput screening of clones for protein expression and solubility.

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