title: GFP reporter screens for the engineering of amino acid degrading enzymes from libraries expressed in bacteria.
abstract: There is significant interest in engineering human amino acid degrading enzymes as non-immunogenic chemotherapeutic agents. We describe a high-throughput fluorescence activated cell sorting (FACS) assay for detecting the catalytic activity of amino acid degrading enzymes in bacteria, at the single cell level. This assay relies on coupling the synthesis of the GFP reporter to the catalytic activity of the desired amino acid degrading enzyme in an appropriate E. coli genetic background. The method described here allows facile screening of much larger libraries (10(6)-10(7)) than was previously possible. We demonstrate the application of this technique in the screening of libraries of bacterial and human asparaginases and also for the catalytic optimization of an engineered human methionine gamma lyase.
authors: Department of Chemical Engineering, University of Texas, Austin, TX, USA.
authors: Olga
authors: O
authors: Paley
authors: Giulia
authors: G
authors: Agnello
authors: Jason
authors: J
authors: Cantor
authors: Tae Hyun
authors: TH
authors: Yoo
authors: George
authors: G
authors: Georgiou
authors: Everett
authors: E
authors: Stone
mesh_terms: D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005434:Flow Cytometry; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism*; D015202:Protein Engineering / Q000379:methods*
chemical_list: D049452:Green Fluorescent Proteins