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Colón EM, Haddock LA, Lasalde C, Lin Q, Ramírez-Lugo JS, González CI. Characterization of the mIF4G Domains in the RNA Surveillance Protein Upf2p. Curr Issues Mol Biol 2023; 46:244-261. [PMID: 38248319 PMCID: PMC10814901 DOI: 10.3390/cimb46010017] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 12/11/2023] [Accepted: 12/22/2023] [Indexed: 01/23/2024] Open
Abstract
Thirty percent of all mutations causing human disease generate mRNAs with premature termination codons (PTCs). Recognition and degradation of these PTC-containing mRNAs is carried out by the mechanism known as nonsense-mediated mRNA decay (NMD). Upf2 is a scaffold protein known to be a central component of the NMD surveillance pathway. It harbors three middle domains of eukaryotic initiation factor 4G (mIF4G-1, mIF4G-2, mIF4G-3) in its N-terminal region that are potentially important in regulating the surveillance pathway. In this study, we defined regions within the mIF4G-1 and mIF4G-2 that are required for proper function of Upf2p in NMD and translation termination in Saccharomyces cerevisiae. In addition, we narrowed down the activity of these regions to an aspartic acid (D59) in mIF4G-1 that is important for NMD activity and translation termination accuracy. Taken together, these studies suggest that inherently charged residues within mIF4G-1 of Upf2p play a role in the regulation of the NMD surveillance mechanism in S. cerevisiae.
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Affiliation(s)
- Edgardo M. Colón
- Department of Biology, Río Piedras Campus, University of Puerto Rico, San Juan, PR 00931, USA (C.L.); (J.S.R.-L.)
- Molecular Sciences Research Center, University of Puerto Rico, San Juan, PR 00926, USA
| | - Luis A. Haddock
- Department of Biology, Río Piedras Campus, University of Puerto Rico, San Juan, PR 00931, USA (C.L.); (J.S.R.-L.)
- Molecular Sciences Research Center, University of Puerto Rico, San Juan, PR 00926, USA
| | - Clarivel Lasalde
- Department of Biology, Río Piedras Campus, University of Puerto Rico, San Juan, PR 00931, USA (C.L.); (J.S.R.-L.)
| | - Qishan Lin
- Department of Chemistry, University at Albany, Albany, NY 12222, USA;
- RNA Epitranscriptomics and Proteomics Resource, University at Albany, Albany, NY 12222, USA
| | - Juan S. Ramírez-Lugo
- Department of Biology, Río Piedras Campus, University of Puerto Rico, San Juan, PR 00931, USA (C.L.); (J.S.R.-L.)
| | - Carlos I. González
- Department of Biology, Río Piedras Campus, University of Puerto Rico, San Juan, PR 00931, USA (C.L.); (J.S.R.-L.)
- Molecular Sciences Research Center, University of Puerto Rico, San Juan, PR 00926, USA
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Affiliation(s)
- Kirk U Knowlton
- Intermountain Medical Center Heart Institute, Salt Lake City, UT. University of Utah School of Medicine, Salt Lake City
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