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Ng M, Zhang H, Weil A, Singh V, Jamiolkowski R, Baradaran-Heravi A, Roberge M, Jacobson A, Friesen W, Welch E, Goldman YE, Cooperman BS. New in Vitro Assay Measuring Direct Interaction of Nonsense Suppressors with the Eukaryotic Protein Synthesis Machinery. ACS Med Chem Lett 2018; 9:1285-1291. [PMID: 30613341 PMCID: PMC6295867 DOI: 10.1021/acsmedchemlett.8b00472] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 11/21/2018] [Indexed: 02/06/2023] Open
Abstract
Nonsense suppressors (NonSups) induce "readthrough", i.e., the selection of near cognate tRNAs at premature termination codons and insertion of the corresponding amino acid into nascent polypeptide. Prior readthrough measurements utilized contexts in which NonSups can promote readthrough directly, by binding to one or more of the components of the protein synthesis machinery, or indirectly, by several other mechanisms. Here we utilize a new, highly purified in vitro assay to measure exclusively direct nonsense suppressor-induced readthrough. Of 16 NonSups tested, 12 display direct readthrough, with results suggesting that such NonSups act by at least two different mechanisms. In preliminary work we demonstrate the potential of single molecule fluorescence energy transfer measurements to elucidate mechanisms of NonSup-induced direct readthrough, which will aid efforts to identify NonSups having improved clinical efficacy.
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Affiliation(s)
- Martin
Y. Ng
- Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Haibo Zhang
- Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Amy Weil
- Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Vijay Singh
- Department
of Physiology, Perelman School of Medicine,
University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Ryan Jamiolkowski
- Department
of Physiology, Perelman School of Medicine,
University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Alireza Baradaran-Heravi
- Department
of Biochemistry and Molecular Biology, University
of British Columbia, Vancouver, BC, Canada V6T 1Z3
| | - Michel Roberge
- Department
of Biochemistry and Molecular Biology, University
of British Columbia, Vancouver, BC, Canada V6T 1Z3
| | - Allan Jacobson
- Department
of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts 01655, United States
| | - Westley Friesen
- PTC
Therapeutics, 100 Corporate Court, South Plainfield, New Jersey 07080, United States
| | - Ellen Welch
- PTC
Therapeutics, 100 Corporate Court, South Plainfield, New Jersey 07080, United States
| | - Yale E. Goldman
- Department
of Physiology, Perelman School of Medicine,
University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Barry S. Cooperman
- Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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