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Coto ALDS, Pereira AA, Oliveira SD, Moritz MNDO, Franco da Rocha AM, Dores-Silva PR, da Silva NSM, de Araújo Nogueira AR, Gava LM, Seraphim TV, Borges JC. Structural characterization of the human DjC20/HscB cochaperone in solution. BIOCHIMICA ET BIOPHYSICA ACTA. PROTEINS AND PROTEOMICS 2024; 1872:140970. [PMID: 37871810 DOI: 10.1016/j.bbapap.2023.140970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 09/27/2023] [Accepted: 10/14/2023] [Indexed: 10/25/2023]
Abstract
J-domain proteins (JDPs) form a very large molecular chaperone family involved in proteostasis processes, such as protein folding, trafficking through membranes and degradation/disaggregation. JDPs are Hsp70 co-chaperones capable of stimulating ATPase activity as well as selecting and presenting client proteins to Hsp70. In mitochondria, human DjC20/HscB (a type III JDP that possesses only the conserved J-domain in some region of the protein) is involved in [FeS] protein biogenesis and assists human mitochondrial Hsp70 (HSPA9). Human DjC20 possesses a zinc-finger domain in its N-terminus, which closely contacts the J-domain and appears to be essential for its function. Here, we investigated the hDjC20 structure in solution as well as the importance of Zn+2 for its stability. The recombinant hDjC20 was pure, folded and capable of stimulating HSPA9 ATPase activity. It behaved as a slightly elongated monomer, as attested by small-angle X-ray scattering and SEC-MALS. The presence of Zn2+ in the hDjC20 samples was verified, a stoichiometry of 1:1 was observed, and its removal by high concentrations of EDTA and DTPA was unfeasible. However, thermal and chemical denaturation in the presence of EDTA led to a reduction in protein stability, suggesting a synergistic action between the chelating agent and denaturators that facilitate protein unfolding depending on metal removal. These data suggest that the affinity of Zn+2 for the protein is very high, evidencing its importance for the hDjC20 structure.
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Affiliation(s)
| | - Arthur Alexandre Pereira
- São Carlos Institute of Chemistry, University of São Paulo - USP, 13560-970 São Carlos, SP, Brazil
| | - Sabrina Dorta Oliveira
- São Carlos Institute of Chemistry, University of São Paulo - USP, 13560-970 São Carlos, SP, Brazil
| | | | | | | | | | | | | | - Thiago Vagas Seraphim
- São Carlos Institute of Chemistry, University of São Paulo - USP, 13560-970 São Carlos, SP, Brazil
| | - Júlio César Borges
- São Carlos Institute of Chemistry, University of São Paulo - USP, 13560-970 São Carlos, SP, Brazil.
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2
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Mafethe O, Ntseane T, Dongola TH, Shonhai A, Gumede NJ, Mokoena F. Pharmacophore Model-Based Virtual Screening Workflow for Discovery of Inhibitors Targeting Plasmodium falciparum Hsp90. ACS OMEGA 2023; 8:38220-38232. [PMID: 37867657 PMCID: PMC10586269 DOI: 10.1021/acsomega.3c04494] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 09/07/2023] [Indexed: 10/24/2023]
Abstract
Plasmodium falciparum causes the most lethal and widespread form of malaria. Eradication of malaria remains a priority due to the increasing number of cases of drug resistance. The heat shock protein 90 of P. falciparum (PfHsp90) is a validated drug target essential for parasite survival. Most PfHsp90 inhibitors bind at the ATP binding pocket found in its N-terminal domain, abolishing the chaperone's activities, which leads to parasite death. The challenge is that the NTD of PfHsp90 is highly conserved, and its disruption requires selective inhibitors that can act without causing off-target human Hsp90 activities. We endeavored to discover selective inhibitors of PfHsp90 using pharmacophore modeling, virtual screening protocols, induced fit docking (IFD), and cell-based and biochemical assays. The pharmacophore model (DHHRR), composed of one hydrogen bond donor, two hydrophobic groups, and two aromatic rings, was used to mine commercial databases for initial hits, which were rescored to 20 potential hits using IFD. Eight of these compounds displayed moderate to high activity toward P. falciparum NF54 (i.e., IC50s ranging from 6.0 to 0.14 μM) and averaged >10 in terms of selectivity indices toward CHO and HepG2 cells. Additionally, four compounds inhibited PfHsp90 with greater selectivity than a known inhibitor, harmine, and bound to PfHsp90 with weak to moderate affinity. Our findings support the use of a pharmacophore model to discover diverse chemical scaffolds such as FM2, FM6, F10, and F11 exhibiting anti-Plasmodium activities and serving as valuable new PfHsp90 inhibitors. Optimization of these hits may enable their development into potent leads for future antimalarial drugs.
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Affiliation(s)
- Ofentse Mafethe
- Department
of Biochemistry, North-West University, Mmabatho 2735, South Africa
| | - Tlhalefo Ntseane
- Department
of Biochemistry, North-West University, Mmabatho 2735, South Africa
| | | | - Addmore Shonhai
- Department
of Biochemistry and Microbiology, University
of Venda, Thohoyandou 0950, South Africa
| | - Njabulo Joyfull Gumede
- Department
of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University (WSU), Private Bag X01, Umthatha, Eastern Cape 4099, South Africa
| | - Fortunate Mokoena
- Department
of Biochemistry, North-West University, Mmabatho 2735, South Africa
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3
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Wang YX, Yu TF, Wang CX, Wei JT, Zhang SX, Liu YW, Chen J, Zhou YB, Chen M, Ma YZ, Lan JH, Zheng JC, Li F, Xu ZS. Heat shock protein TaHSP17.4, a TaHOP interactor in wheat, improves plant stress tolerance. Int J Biol Macromol 2023; 246:125694. [PMID: 37414309 DOI: 10.1016/j.ijbiomac.2023.125694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 06/30/2023] [Accepted: 07/02/2023] [Indexed: 07/08/2023]
Abstract
Adaptation to drought and salt stresses is a fundamental part of plant cell physiology and is of great significance for crop production under environmental stress. Heat shock proteins (HSPs) are molecular chaperones that play a crucial role in folding, assembling, translocating, and degrading proteins. However, their underlying mechanisms and functions in stress tolerance remain elusive. Here, we identified the HSP TaHSP17.4 in wheat by analyzing the heat stress-induced transcriptome. Further analysis showed that TaHSP17.4 was significantly induced under drought, salt, and heat stress treatments. Intriguingly, yeast-two-hybrid analysis showed that TaHSP17.4 interacts with the HSP70/HSP90 organizing protein (HOP) TaHOP, which plays a significant role in linking HSP70 and HSP90. We found that TaHSP17.4- and TaHOP-overexpressing plants have a higher proline content and a lower malondialdehyde content than wild-type plants under stress conditions and display strong tolerance to drought, salt, and heat stress. Additionally, qRT-PCR analysis showed that stress-responsive genes relevant to reactive oxygen species scavenging and abscisic acid signaling pathways were significantly induced in TaHSP17.4- and TaHOP-overexpressing plants under stress conditions. Together, our findings provide insight into HSP functions in wheat and two novel candidate genes for improvement of wheat varieties.
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Affiliation(s)
- Yi-Xuan Wang
- College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China; Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - Tai-Fei Yu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China; Hunan Provincial Key Laboratory of the Research and Development of Novel Pharmaceutical Preparations, the "Double-First Class" Application Characteristic Discipline of Hunan Province (Pharmaceutical Science), Changsha Medical University, Changsha 410219, China
| | - Chun-Xiao Wang
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - Ji-Tong Wei
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - Shuang-Xi Zhang
- Institute of Crop Science, Ningxia Academy of Agriculture and Forestry Sciences, Yongning 750105, China
| | - Yong-Wei Liu
- Institute of Biotechnology and Food Science, Hebei Academy of Agriculture and Forestry Sciences/Plant Genetic Engineering Center of Hebei Province, Shijiazhuang 050051, China
| | - Jun Chen
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - Yong-Bin Zhou
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - Ming Chen
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - You-Zhi Ma
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - Jin-Hao Lan
- College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
| | - Jia-Cheng Zheng
- Anhui Science and Technology University, College of Agronomy, Fengyang 233100, China
| | - Feng Li
- Hunan Provincial Key Laboratory of the Research and Development of Novel Pharmaceutical Preparations, the "Double-First Class" Application Characteristic Discipline of Hunan Province (Pharmaceutical Science), Changsha Medical University, Changsha 410219, China.
| | - Zhao-Shi Xu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China; National Nanfan Research Institute (Sanya), Chinese Academy of Agricultural Sciences/Hainan Yazhou Bay Seed Laboratory, Sanya 572024, China.
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Hsp70/Hsp90 Organising Protein (Hop): Coordinating Much More than Chaperones. Subcell Biochem 2023; 101:81-125. [PMID: 36520304 DOI: 10.1007/978-3-031-14740-1_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The Hsp70/Hsp90 organising protein (Hop, also known as stress-inducible protein 1/STI1/STIP1) has received considerable attention for diverse cellular functions in both healthy and diseased states. There is extensive evidence that intracellular Hop is a co-chaperone of the major chaperones Hsp70 and Hsp90, playing an important role in the productive folding of Hsp90 client proteins, although recent evidence suggests that eukaryotic Hop is regulatory within chaperone complexes rather than essential. Consequently, Hop is implicated in many key signalling pathways, including aberrant pathways leading to cancer. Hop is also secreted, and it is now well established that Hop interacts with the prion protein, PrPC, to mediate multiple signalling events. The intracellular and extracellular forms of Hop most likely represent two different isoforms, although the molecular determinants of these divergent functions are yet to be identified. There is also a growing body of research that reports the involvement of Hop in cellular activities that appear independent of either chaperones or PrPC. While the various cellular functions of Hop have been described, its biological function remains elusive. However, recent knockout studies in mammals suggest that Hop has an important role in embryonic development. This review provides a critical overview of the latest molecular, cellular and biological research on Hop, critically evaluating its function in healthy systems and how this function is adapted in diseased states.
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5
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Stofberg ML, Caillet C, de Villiers M, Zininga T. Inhibitors of the Plasmodium falciparum Hsp90 towards Selective Antimalarial Drug Design: The Past, Present and Future. Cells 2021; 10:2849. [PMID: 34831072 PMCID: PMC8616389 DOI: 10.3390/cells10112849] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/14/2021] [Accepted: 10/15/2021] [Indexed: 12/12/2022] Open
Abstract
Malaria is still one of the major killer parasitic diseases in tropical settings, posing a public health threat. The development of antimalarial drug resistance is reversing the gains made in attempts to control the disease. The parasite leads a complex life cycle that has adapted to outwit almost all known antimalarial drugs to date, including the first line of treatment, artesunate. There is a high unmet need to develop new strategies and identify novel therapeutics to reverse antimalarial drug resistance development. Among the strategies, here we focus and discuss the merits of the development of antimalarials targeting the Heat shock protein 90 (Hsp90) due to the central role it plays in protein quality control.
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Affiliation(s)
| | | | | | - Tawanda Zininga
- Department of Biochemistry, Stellenbosch University, Stellenbosch 7600, South Africa; (M.L.S.); (C.C.); (M.d.V.)
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6
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The Role of Hsp70s in the Development and Pathogenicity of Plasmodium falciparum. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021. [PMID: 34569021 DOI: 10.1007/978-3-030-78397-6_3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
The main agent of human malaria, the protozoa, Plasmodium falciparum is known to infect liver cells, subsequently invading the host erythrocyte, leading to the manifestation of clinical outcomes of the disease. As part of its survival in the human host, P. falciparum employs several heat shock protein (Hsp) families whose primary purpose is to ensure cytoprotection through their molecular chaperone role. The parasite expresses six Hsp70s that localise to various subcellular organelles of the parasite, with one, PfHsp70-x, being exported to the infected human erythrocyte. The role of these Hsp70s in the survival and pathogenicity of malaria has received immense research attention. Several studies have reported on their structure-function features, network partnerships, and elucidation of their potential substrates. Apart from their role in cytoprotection and pathogenicity, Hsp70s are implicated in antimalarial drug resistance. As such, they are deemed potential antimalarial drug candidates, especially suited for co-targeting in combination therapies. In addition, Hsp70 is implicated in host immune modulation. The current report highlights the various structure-function features of these proteins, their roles in the development of malaria, current and prospective efforts being employed towards targeting them in malaria intervention efforts.
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7
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Tavella TA, da Silva NSM, Spillman N, Kayano ACAV, Cassiano GC, Vasconcelos AA, Camargo AP, da Silva DCB, Fontinha D, Salazar Alvarez LC, Ferreira LT, Peralis Tomaz KC, Neves BJ, Almeida LD, Bargieri DY, Lacerda MVGD, Lemos Cravo PV, Sunnerhagen P, Prudêncio M, Andrade CH, Pinto Lopes SC, Carazzolle MF, Tilley L, Bilsland E, Borges JC, Maranhão Costa FT. Violacein-Induced Chaperone System Collapse Underlies Multistage Antiplasmodial Activity. ACS Infect Dis 2021; 7:759-776. [PMID: 33689276 PMCID: PMC8042658 DOI: 10.1021/acsinfecdis.0c00454] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Antimalarial drugs with novel modes of action and wide therapeutic potential are needed to pave the way for malaria eradication. Violacein is a natural compound known for its biological activity against cancer cells and several pathogens, including the malaria parasite, Plasmodium falciparum (Pf). Herein, using chemical genomic profiling (CGP), we found that violacein affects protein homeostasis. Mechanistically, violacein binds Pf chaperones, PfHsp90 and PfHsp70-1, compromising the latter's ATPase and chaperone activities. Additionally, violacein-treated parasites exhibited increased protein unfolding and proteasomal degradation. The uncoupling of the parasite stress response reflects the multistage growth inhibitory effect promoted by violacein. Despite evidence of proteotoxic stress, violacein did not inhibit global protein synthesis via UPR activation-a process that is highly dependent on chaperones, in agreement with the notion of a violacein-induced proteostasis collapse. Our data highlight the importance of a functioning chaperone-proteasome system for parasite development and differentiation. Thus, a violacein-like small molecule might provide a good scaffold for development of a novel probe for examining the molecular chaperone network and/or antiplasmodial drug design.
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Affiliation(s)
- Tatyana Almeida Tavella
- Laboratory of Tropical Diseases−Prof. Dr. Luiz Jacinto da Silva, Department of Genetics, Evolution, Microbiology and Immunology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
| | - Noeli Soares Melo da Silva
- Biochemistry and Biophysics of Proteins Group−São Carlos Institute of Chemistry−IQSC, University of São Paulo, Trabalhador Sancarlense Avenue, 400, BQ1, S27, São Carlos, SP 13566-590, Brazil
| | - Natalie Spillman
- Department of Biochemistry, Bio 21 Institute, University of Melbourne, 30 Flemington Rd, Parkville, Melbourne,VIC 3052, Australia
| | - Ana Carolina Andrade Vitor Kayano
- Laboratory of Tropical Diseases−Prof. Dr. Luiz Jacinto da Silva, Department of Genetics, Evolution, Microbiology and Immunology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
| | - Gustavo Capatti Cassiano
- Laboratory of Tropical Diseases−Prof. Dr. Luiz Jacinto da Silva, Department of Genetics, Evolution, Microbiology and Immunology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
- Global Health and Tropical Medicine (GHTM), Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa, 1099-085 Lisboa, Portugal
| | - Adrielle Ayumi Vasconcelos
- Laboratory of Genomics and BioEnergy, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
| | - Antônio Pedro Camargo
- Laboratory of Genomics and BioEnergy, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
| | - Djane Clarys Baia da Silva
- Leônidas & Maria Deane Institute, Fundação Oswaldo Cruz−FIOCRUZ, Manaus , AM 69057070, Brazil
- Fundação de Medicina Tropical−Dr. Heitor Vieira Dourado, Manaus, AM 69040-000, Brazil
| | - Diana Fontinha
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, 1649-004 Lisboa, Portugal
| | - Luis Carlos Salazar Alvarez
- Laboratory of Tropical Diseases−Prof. Dr. Luiz Jacinto da Silva, Department of Genetics, Evolution, Microbiology and Immunology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
| | - Letícia Tiburcio Ferreira
- Laboratory of Tropical Diseases−Prof. Dr. Luiz Jacinto da Silva, Department of Genetics, Evolution, Microbiology and Immunology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
| | - Kaira Cristina Peralis Tomaz
- Laboratory of Tropical Diseases−Prof. Dr. Luiz Jacinto da Silva, Department of Genetics, Evolution, Microbiology and Immunology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
| | - Bruno Junior Neves
- Laboratory of Molecular Modeling and Drug Design, LabMol, Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia, GO 74605-170, Brazil
- LabChem−Laboratory of Cheminformatics, Centro Universitário de Anápolis−UniEVANGÉLICA, Anápolis, GO 75083-515, Brazil
| | - Ludimila Dias Almeida
- Synthetic Biology Laboratory, Department of Structural and Functional Biology, Institute of Biology, UNICAMP, Campinas, SP Brazil
| | - Daniel Youssef Bargieri
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, Cidade Universitária “Armando Salles Oliveira”, São Paulo 05508-000, Brazil
| | | | - Pedro Vitor Lemos Cravo
- LabChem−Laboratory of Cheminformatics, Centro Universitário de Anápolis−UniEVANGÉLICA, Anápolis, GO 75083-515, Brazil
- Global Health and Tropical Medicine (GHTM), Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa, 1099-085 Lisboa, Portugal
| | - Per Sunnerhagen
- Department of Chemistry and Molecular Biology, University of Gothenburg, 405 30 Gothenburg, Sweden
| | - Miguel Prudêncio
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, 1649-004 Lisboa, Portugal
| | - Carolina Horta Andrade
- Laboratory of Tropical Diseases−Prof. Dr. Luiz Jacinto da Silva, Department of Genetics, Evolution, Microbiology and Immunology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
- Laboratory of Molecular Modeling and Drug Design, LabMol, Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia, GO 74605-170, Brazil
| | - Stefanie Costa Pinto Lopes
- Leônidas & Maria Deane Institute, Fundação Oswaldo Cruz−FIOCRUZ, Manaus , AM 69057070, Brazil
- Fundação de Medicina Tropical−Dr. Heitor Vieira Dourado, Manaus, AM 69040-000, Brazil
| | - Marcelo Falsarella Carazzolle
- Laboratory of Genomics and BioEnergy, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
| | - Leann Tilley
- Department of Biochemistry, Bio 21 Institute, University of Melbourne, 30 Flemington Rd, Parkville, Melbourne,VIC 3052, Australia
| | - Elizabeth Bilsland
- Synthetic Biology Laboratory, Department of Structural and Functional Biology, Institute of Biology, UNICAMP, Campinas, SP Brazil
| | - Júlio César Borges
- Biochemistry and Biophysics of Proteins Group−São Carlos Institute of Chemistry−IQSC, University of São Paulo, Trabalhador Sancarlense Avenue, 400, BQ1, S27, São Carlos, SP 13566-590, Brazil
| | - Fabio Trindade Maranhão Costa
- Laboratory of Tropical Diseases−Prof. Dr. Luiz Jacinto da Silva, Department of Genetics, Evolution, Microbiology and Immunology, University of Campinas−UNICAMP, Campinas, SP 13083-970, Brazil
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Role of Heat Shock Proteins in Immune Modulation in Malaria. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1340:169-186. [PMID: 34569025 DOI: 10.1007/978-3-030-78397-6_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Malaria is one of the major parasitic killer diseases worldwide. Severe cases of malaria are mostly in children under the age of 5 years due to their naïve immune system and in pregnant women with weakened immune responses. Inflammatory immune responses against the parasite involve complement activation as well as the antibody and effector cell-mediated immune system. However, after an infection with Plasmodium falciparum (P. falciparum), the most dangerous malaria species, the host-derived immunity is often insufficient to completely inhibit the infection cycles of the parasite in red blood cells for yet unknown reasons. In the present chapter we aim to elucidate the role of the host's and the parasite's heat shock proteins (HSPs) in the development of a novel anti-malaria therapeutic approach.
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Shonhai A, Blatch GL. Heat Shock Proteins of Malaria: Highlights and Future Prospects. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1340:237-246. [PMID: 34569028 DOI: 10.1007/978-3-030-78397-6_10] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The deadliest malaria parasite of humans, Plasmodium falciparum, is an obligate parasite that has had to develop mechanisms for survival under the unfavourable conditions it confronts within host cells. The chapters in the book "Heat Shock Proteins of Malaria" provide a critique of the evidence that heat shock proteins (Hsps) play a key role in the survival of P. falciparum in host cells. The role of the plasmodial Hsp arsenal is not limited to the protection of the parasite cell (largely through their role as molecular chaperones), as some of these proteins also promote the pathological development of malaria. This is largely due to the export of a large number of these proteins into the infected erythrocyte cytosol. Although P. falciparum erythrocyte membrane protein 1 (PfEMP1) is the main virulence factor for the malaria parasite, some of the exported plasmodial Hsps appear to augment parasite virulence. While this book largely delves into experimentally validated information on the role of Hsps in the development and pathogenicity of malaria, some of the information is based on hypotheses yet to be fully tested. Therefore, here we highlight what we know to be definite roles of plasmodial Hsps. Furthermore, we distill information that could provide practical insights on the options available for future research directions, including interventions against malaria that may target the role of Hsps in the development of the disease.
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Affiliation(s)
- Addmore Shonhai
- Department of Biochemistry, University of Venda, Thohoyandou, South Africa.
| | - Gregory L Blatch
- The Vice Chancellery, The University of Notre Dame Australia, Fremantle, WA, Australia. .,Biomedical Biotechnology Research Unit, Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, South Africa. .,The Institute of Immunology and Infectious Diseases, Murdoch University, Murdoch, WA, Australia. .,Faculty of Health Sciences, Higher Colleges of Technology, Sharjah, United Arab Emirates.
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10
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Makumire S, Zininga T, Vahokoski J, Kursula I, Shonhai A. Biophysical analysis of Plasmodium falciparum Hsp70-Hsp90 organising protein (PfHop) reveals a monomer that is characterised by folded segments connected by flexible linkers. PLoS One 2020; 15:e0226657. [PMID: 32343703 PMCID: PMC7188212 DOI: 10.1371/journal.pone.0226657] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 04/03/2020] [Indexed: 12/20/2022] Open
Abstract
Plasmodium falciparum causes the most lethal form of malaria. The cooperation of heat shock protein (Hsp) 70 and 90 is thought to facilitate folding of select group of cellular proteins that are crucial for cyto-protection and development of the parasites. Hsp70 and Hsp90 are brought into a functional complex that allows substrate exchange by stress inducible protein 1 (STI1), also known as Hsp70-Hsp90 organising protein (Hop). P. falciparum Hop (PfHop) co-localises and occurs in complex with the parasite cytosolic chaperones, PfHsp70-1 and PfHsp90. Here, we characterised the structure of recombinant PfHop using synchrotron radiation circular dichroism (SRCD) and small-angle X-ray scattering. Structurally, PfHop is a monomeric, elongated but folded protein, in agreement with its predicted TPR domain structure. Using SRCD, we established that PfHop is unstable at temperatures higher than 40°C. This suggests that PfHop is less stable at elevated temperatures compared to its functional partner, PfHsp70-1, that is reportedly stable at temperatures as high as 80°C. These findings contribute towards our understanding of the role of the Hop-mediated functional partnership between Hsp70 and Hsp90.
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Affiliation(s)
- Stanley Makumire
- Department of Biochemistry, School of Mathematical & Natural Sciences, University of Venda, Thohoyandou, South Africa
| | - Tawanda Zininga
- Department of Biochemistry, School of Mathematical & Natural Sciences, University of Venda, Thohoyandou, South Africa
- Department of Biochemistry, Stellenbosch University, Stellenbosch, South Africa
| | - Juha Vahokoski
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Inari Kursula
- Department of Biomedicine, University of Bergen, Bergen, Norway
- Biocenter Oulu & Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Addmore Shonhai
- Department of Biochemistry, School of Mathematical & Natural Sciences, University of Venda, Thohoyandou, South Africa
- * E-mail:
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Plasmodium falciparum R2TP complex: driver of parasite Hsp90 function. Biophys Rev 2019; 11:1007-1015. [PMID: 31734827 DOI: 10.1007/s12551-019-00605-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 10/30/2019] [Indexed: 02/04/2023] Open
Abstract
Heat shock protein 90 (Hsp90) is essential for the development of the main malaria agent, Plasmodium falciparum. Inhibitors that target Hsp90 function are known to not only kill the parasite, but also reverse resistance of the parasite to traditional antimalarials such as chloroquine. For this reason, Hsp90 has been tagged as a promising antimalarial drug target. As a molecular chaperone, Hsp90 facilitates folding of proteins such as steroid hormone receptors and kinases implicated in cell cycle and development. Central to Hsp90 function is its regulation by several co-chaperones. Various co-chaperones interact with Hsp90 to modulate its co-operation with other molecular chaperones such as Hsp70 and to regulate its interaction with substrates. The role of Hsp90 in the development of malaria parasites continues to receive research attention, and several Hsp90 co-chaperones have been mapped out. Recently, focus has shifted to P. falciparum R2TP proteins, which are thought to couple Hsp90 to a diverse set of client proteins. R2TP proteins are generally known to form a complex with Hsp90, and this complex drives multiple cellular processes central to signal transduction and cell division. Given the central role that the R2TP complex may play, the current review highlights the structure-function features of Hsp90 relative to R2TPs of P. falciparum.
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