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Kelly C, Ahmed Y, Elghawy O, Pachon NF, Fontanese MS, Kim S, Kitterman E, Marley A, Terrenzio D, Wike R, Zeibekis T, Cameron DM. The human ribosome-associated complex suppresses prion formation in yeast. Proteins 2023; 91:715-723. [PMID: 36604744 PMCID: PMC10159891 DOI: 10.1002/prot.26461] [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: 08/23/2022] [Revised: 12/21/2022] [Accepted: 12/27/2022] [Indexed: 01/07/2023]
Abstract
Many human diseases are associated with the misfolding of amyloidogenic proteins. Understanding the mechanisms cells employ to ensure the integrity of the proteome is therefore a crucial step in the development of potential therapeutic interventions. Yeast cells possess numerous prion-forming proteins capable of adopting amyloid conformations, possibly as an epigenetic mechanism to cope with changing environmental conditions. The ribosome-associated complex (RAC), which docks near the ribosomal polypeptide exit tunnel and recruits the Hsp70 Ssb to chaperone nascent chains, can moderate the acquisition of these amyloid conformations in yeast. Here we examine the ability of the human RAC chaperone proteins Mpp11 and Hsp70L1 to function in place of their yeast RAC orthologues Zuo1 and Ssz1 in yeast lacking endogenous RAC and investigate the extent to which the human orthologues can perform RAC chaperone activities in yeast. We found that the Mpp11/Hsp70L1 complex can partially correct the growth defect seen in RAC-deficient yeast cells, although yeast/human hetero species complexes were variable in this ability. The proportion of cells in which the Sup35 protein undergoes spontaneous conversion to a [PSI+ ] prion conformation, which is increased in the absence of RAC, was reduced by the presence of the human RAC complex. However, the toxicity in yeast from expression of a pathogenically expanded polyQ protein was unable to be countered by the human RAC chaperones. This yeast system can serve as a facile model for studying the extent to which the human RAC chaperones contribute to combating cotranslational misfolding of other mammalian disease-associated proteins.
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Affiliation(s)
- Christina Kelly
- Biology Department, Ursinus College, Collegeville, PA, 19426, USA
| | - Yusef Ahmed
- Biology Department, Ursinus College, Collegeville, PA, 19426, USA
- Present address: Department of Chemistry, University of California – Davis, Davis, California 95616, USA
| | - Omar Elghawy
- Biology Department, Ursinus College, Collegeville, PA, 19426, USA
- Present address: University of Virginia School of Medicine, Charlottesville, VA, 22903, USA
| | | | - Matthew S. Fontanese
- Biology Department, Ursinus College, Collegeville, PA, 19426, USA
- Present address: Department of clinical psychology; University of Texas at Tyler, Tyler, TX, 75799, USA
| | - Seongchan Kim
- Biology Department, Ursinus College, Collegeville, PA, 19426, USA
| | - Erica Kitterman
- Biology Department, Ursinus College, Collegeville, PA, 19426, USA
- Present address: Department of Cancer Biology, Thomas Jefferson University, Philadelphia, PA, 19107, USA
| | - Amanda Marley
- Biology Department, Ursinus College, Collegeville, PA, 19426, USA
| | - Danielle Terrenzio
- Biology Department, Ursinus College, Collegeville, PA, 19426, USA
- Present address: Doctor of Osteopathic Medicine Program, Philadelphia College of Osteopathic Medicine, Philadelphia, PA, 19131, USA
| | - Richard Wike
- Biology Department, Ursinus College, Collegeville, PA, 19426, USA
- Present address: Physiology Department, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19104, USA
| | | | - Dale M. Cameron
- Biology Department, Ursinus College, Collegeville, PA, 19426, USA
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