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Antonio LM, Martins GH, Aragão AZB, Quel NG, Zazeri G, Houry WA, Ramos CHI. Unveiling the Role of Sorghum RPAP3 in the Function of R2TP Complex: Insights into Protein Assembly in Plants. PLANTS (BASEL, SWITZERLAND) 2023; 12:2925. [PMID: 37631136 PMCID: PMC10458388 DOI: 10.3390/plants12162925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/04/2023] [Accepted: 08/10/2023] [Indexed: 08/27/2023]
Abstract
The chaperone R2TP has multiple subunits that assist in the proper folding, assembly, and stabilization of various protein complexes in cells and its study can offer valuable insights into the regulation and maintenance of protein assemblies in plant systems. The 'T' component of R2TP is Tah1 in yeast, consisting of 111 residues, while its counterpart in humans is RPAP3, with 665 residues. RPAP3 acts as a co-chaperone of Hsp90 and facilitates interactions between RUVBL proteins and other complex components, enhancing the recruitment of client proteins by the R2TP complex. These facts further underscore the relevance of studying this complex in different organisms. The putative gene corresponding to the RPAP3 in Sorghum bicolor, a monocotyledon plant, was cloned, and the protein (396 residues) purified for biochemical characterization. SbRPAP3 exists as a folded monomer and has a RPAP3 domain, which is present in human RPAP3 but absent in yeast Tah1. SbRPAP3 retains its functional capabilities, including binding with RUVBLs, Hsp90, and Hsp70. By elucidating the role of RPAP3 in plant R2TP complex, we can further comprehend the molecular mechanisms underlying plant-specific protein assembly and contribute to advancements in plant biology and biotechnological applications.
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Affiliation(s)
- Larissa Machado Antonio
- Institute of Chemistry, University of Campinas—UNICAMP, Campinas 13100-104, SP, Brazil; (L.M.A.); (G.H.M.); (A.Z.B.A.); (N.G.Q.); (G.Z.)
| | - Gustavo Henrique Martins
- Institute of Chemistry, University of Campinas—UNICAMP, Campinas 13100-104, SP, Brazil; (L.M.A.); (G.H.M.); (A.Z.B.A.); (N.G.Q.); (G.Z.)
| | - Annelize Zambon Barbosa Aragão
- Institute of Chemistry, University of Campinas—UNICAMP, Campinas 13100-104, SP, Brazil; (L.M.A.); (G.H.M.); (A.Z.B.A.); (N.G.Q.); (G.Z.)
| | - Natália Galdi Quel
- Institute of Chemistry, University of Campinas—UNICAMP, Campinas 13100-104, SP, Brazil; (L.M.A.); (G.H.M.); (A.Z.B.A.); (N.G.Q.); (G.Z.)
| | - Gabriel Zazeri
- Institute of Chemistry, University of Campinas—UNICAMP, Campinas 13100-104, SP, Brazil; (L.M.A.); (G.H.M.); (A.Z.B.A.); (N.G.Q.); (G.Z.)
| | - Walid A. Houry
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada;
- Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada
| | - Carlos Henrique Inacio Ramos
- Institute of Chemistry, University of Campinas—UNICAMP, Campinas 13100-104, SP, Brazil; (L.M.A.); (G.H.M.); (A.Z.B.A.); (N.G.Q.); (G.Z.)
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Araujo SA, Martins GH, Quel NG, Aragão AZB, Morea EGO, Borges JC, Houry WA, Cano MIN, Ramos CHI. Purification and characterization of a novel and conserved TPR-domain protein that binds both Hsp90 and Hsp70 and is expressed in all developmental stages of Leishmania major. Biochimie 2021; 182:51-60. [PMID: 33421500 DOI: 10.1016/j.biochi.2020.12.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 12/14/2020] [Accepted: 12/26/2020] [Indexed: 12/01/2022]
Abstract
Heat shock proteins (Hsps) are involved in several important aspects of the cell proteostasis. Hsp90 interacts with at least a tenth of the cell proteome helping a large number of proteins to fold correctly. Hsp90 function is modulated by several co-chaperones having TPR (tetratricopeptide repeat) domains that allow for interaction with the C-terminal MEEVD motif of the chaperone. Another important chaperone, Hsp70, has a C-terminal EEVD motif that binds to TPR. Leishmania is a protozoan that causes leishmaniasis, a neglected disease in humans and other animals. There is still no effective treatment for leishmaniasis, however the study of structure and function of the proteins of the parasite may generate potential targets for future therapeutic intervention studies. In this work, the genome of Leishmania major was searched for a novel TPR-domain gene, which is conserved in Leishmania. The recombinant protein, LmTPR, was produced in pure and folded state and was characterized by biophysical tools as a monomer with an elongated conformation. Studies in Leishmania major were also preformed to complement these in vitro experiments. Splice Leader RNA-seq analysis and Western blot indicated that the protein was expressed in all developmental stages of the parasite. Binding assays confirmed that both Hsp90 and Hsp70 bind specifically to LmTPR. Finally, sequence and structural predictions indicated a C-terminal region as a RPAP3 domain. Altogether, this study identified a novel TPR-domain co-chaperone of Hsp90 that is conserved and expressed in all developmental stages of Leishmania major.
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Affiliation(s)
- Sara A Araujo
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, 13083-970 Brazil
| | - Gustavo H Martins
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, 13083-970 Brazil
| | - Natália G Quel
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, 13083-970 Brazil; National Institute of Science & Technology of Structural Biology and Bioimage (INCTBEB), Brazil
| | - Annelize Z B Aragão
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, 13083-970 Brazil
| | - Edna G O Morea
- Department of Chemical and Biological Sciences, Biosciences Institute, Sao Paulo State University, Botucatu, SP, 18618689, Brazil
| | - Julio C Borges
- National Institute of Science & Technology of Structural Biology and Bioimage (INCTBEB), Brazil; São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP, Brazil
| | - Walid A Houry
- Department of Biochemistry, University of Toronto, Toronto, Ontario, M5G 1M1, Canada; Department of Chemistry, University of Toronto, Toronto, Ontario, M5S 3H6, Canada
| | - Maria I N Cano
- Department of Chemical and Biological Sciences, Biosciences Institute, Sao Paulo State University, Botucatu, SP, 18618689, Brazil
| | - Carlos H I Ramos
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, 13083-970 Brazil; National Institute of Science & Technology of Structural Biology and Bioimage (INCTBEB), Brazil.
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