Hinmon JA, King JM, Mayo LJ, Faries CR, Lockett YT, Crawford DW, Beardslee PC, Hendricks A, McNaughton BR. Cell surface β-lactamase recruitment: A facile selection to identify protein-protein interactions.
Protein Sci 2024;
33:e4919. [PMID:
38501433 PMCID:
PMC10949332 DOI:
10.1002/pro.4919]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 12/17/2023] [Accepted: 01/25/2024] [Indexed: 03/20/2024]
Abstract
Protein-protein interactions (PPIs) are central to many cellular processes, and the identification of novel PPIs is a critical step in the discovery of protein therapeutics. Simple methods to identify naturally existing or laboratory evolved PPIs are therefore valuable research tools. We have developed a facile selection that links PPI-dependent β-lactamase recruitment on the surface of Escherichia coli with resistance to ampicillin. Bacteria displaying a protein that forms a complex with a specific protein-β-lactamase fusion are protected from ampicillin-dependent cell death. In contrast, bacteria that do not recruit β-lactamase to the cell surface are killed by ampicillin. Given its simplicity and tunability, we anticipate this selection will be a valuable addition to the palette of methods for illuminating and interrogating PPIs.
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