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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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Franco JC, Nogueira MLC, Gandelini GM, Pinheiro GMS, Gonçalves CC, Barbosa LRS, Young JC, Ramos CHI. Sorghum bicolor SbHSP110 has an elongated shape and is able of protecting against aggregation and replacing human HSPH1/HSP110 in refolding and disaggregation assays. Biopolymers 2023; 114:e23532. [PMID: 36825649 DOI: 10.1002/bip.23532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 02/06/2023] [Accepted: 02/08/2023] [Indexed: 02/25/2023]
Abstract
Perturbations in the native structure, often caused by stressing cellular conditions, not only impair protein function but also lead to the formation of aggregates, which can accumulate in the cell leading to harmful effects. Some organisms, such as plants, express the molecular chaperone HSP100 (homologous to HSP104 from yeast), which has the remarkable capacity to disaggregate and reactivate proteins. Recently, studies with animal cells, which lack a canonical HSP100, have identified the involvement of a distinct system composed of HSP70/HSP40 that needs the assistance of HSP110 to efficiently perform protein breakdown. As sessile plants experience stressful conditions more severe than those experienced by animals, we asked whether a plant HSP110 could also play a role in collaborating with HSP70/HSP40 in a system that increases the efficiency of disaggregation. Thus, the gene for a putative HSP110 from the cereal Sorghum bicolor was cloned and the protein, named SbHSP110, purified. For comparison purposes, human HsHSP110 (HSPH1/HSP105) was also purified and investigated in parallel. First, a combination of spectroscopic and hydrodynamic techniques was used for the characterization of the conformation and stability of recombinant SbHSP110, which was produced folded. Second, small-angle X-ray scattering and combined predictors of protein structure indicated that SbHSP110 and HsHSP110 have similar conformations. Then, the chaperone activities, which included protection against aggregation, refolding, and reactivation, were investigated, showing that SbHSP110 and HsHSP110 have similar functional activities. Altogether, the results add to the structure/function relationship study of HSP110s and support the hypothesis that plants have multiple strategies to act upon the reactivation of protein aggregates.
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Affiliation(s)
- Juliana C Franco
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, Brazil
| | - Maria L C Nogueira
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, Brazil
| | | | | | - Conrado C Gonçalves
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, Brazil
| | - Leandro R S Barbosa
- Institute of Physics, University of São Paulo, São Paulo, SP, Brazil.,Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP, Brazil
| | - Jason C Young
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada
| | - Carlos H I Ramos
- Institute of Chemistry, University of Campinas UNICAMP, Campinas, SP, Brazil.,National Institute of Science & Technology of Structural Biology and Bioimage (INCTBEB), Rio de Janeiro, Brazil
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The Common Bean Small Heat Shock Protein Nodulin 22 from Phaseolus vulgaris L. Assembles into Functional High-Molecular-Weight Oligomers. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27248681. [PMID: 36557819 PMCID: PMC9783675 DOI: 10.3390/molecules27248681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/23/2022] [Accepted: 12/01/2022] [Indexed: 12/13/2022]
Abstract
Small heat shock proteins (sHsps) are present in all domains of life. These proteins are responsible for binding unfolded proteins to prevent their aggregation. sHsps form dynamic oligomers of different sizes and constitute transient reservoirs for folding competent proteins that are subsequently refolded by ATP-dependent chaperone systems. In plants, the sHsp family is rather diverse and has been associated with the ability of plants to survive diverse environmental stresses. Nodulin 22 (PvNod22) is an sHsp of the common bean (Phaseolus vulgaris L.) located in the endoplasmic reticulum. This protein is expressed in response to stress (heat or oxidative) or in plant roots during mycorrhizal and rhizobial symbiosis. In this work, we study its oligomeric state using a combination of in silico and experimental approaches. We found that recombinant PvNod22 was able to protect a target protein from heat unfolding in vitro. We also demonstrated that PvNod22 assembles into high-molecular-weight oligomers with diameters of ~15 nm under stress-free conditions. These oligomers can cluster together to form high-weight polydisperse agglomerates with temperature-dependent interactions; in contrast, the oligomers are stable regarding temperature.
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Waters ER, Vierling E. Plant small heat shock proteins - evolutionary and functional diversity. THE NEW PHYTOLOGIST 2020; 227:24-37. [PMID: 32297991 DOI: 10.1111/nph.16536] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 02/21/2020] [Indexed: 05/22/2023]
Abstract
Small heat shock proteins (sHSPs) are an ubiquitous protein family found in archaea, bacteria and eukaryotes. In plants, as in other organisms, sHSPs are upregulated by stress and are proposed to act as molecular chaperones to protect other proteins from stress-induced damage. sHSPs share an 'α-crystallin domain' with a β-sandwich structure and a diverse N-terminal domain. Although sHSPs are 12-25 kDa polypeptides, most assemble into oligomers with ≥ 12 subunits. Plant sHSPs are particularly diverse and numerous; some species have as many as 40 sHSPs. In angiosperms this diversity comprises ≥ 11 sHSP classes encoding proteins targeted to the cytosol, nucleus, endoplasmic reticulum, chloroplasts, mitochondria and peroxisomes. The sHSPs underwent a lineage-specific gene expansion, diversifying early in land plant evolution, potentially in response to stress in the terrestrial environment, and expanded again in seed plants and again in angiosperms. Understanding the structure and evolution of plant sHSPs has progressed, and a model for their chaperone activity has been proposed. However, how the chaperone model applies to diverse sHSPs and what processes sHSPs protect are far from understood. As more plant genomes and transcriptomes become available, it will be possible to explore theories of the evolutionary pressures driving sHSP diversification.
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Affiliation(s)
- Elizabeth R Waters
- Biology Department, San Diego State University, San Diego, CA, 92182, USA
| | - Elizabeth Vierling
- Department of Biochemistry and Molecular Biology, University of Massachusetts Amherst, Amherst, MA, 01003, USA
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Gonçalves CDC, Pinheiro GMS, Dahlström KM, Souto DEP, Kubota LT, Barbosa LRS, Ramos CHI. On the structure and function of Sorghum bicolor CHIP (carboxyl terminus of Hsc70-interacting protein): A link between chaperone and proteasome systems. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 296:110506. [PMID: 32540021 DOI: 10.1016/j.plantsci.2020.110506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 04/12/2020] [Accepted: 04/18/2020] [Indexed: 06/11/2023]
Abstract
The co-chaperone CHIP (carboxy terminus of Hsc70 interacting protein) is very important for many cell activities since it regulates the ubiquitination of substrates targeted for proteasomal degradation. However, information on the structure-function relationship of CHIP from plants and how it interacts and ubiquitinates other plant chaperones is still needed. For that, the CHIP ortholog from Sorghum bicolor (SbCHIP) was identified and studied in detail. SbCHIP was purified and produced folded and pure, being capable of keeping its structural conformation up to 42 °C, indicating that cellular function is maintained even in a hot environment. Also, SbCHIP was able to bind plant Hsp70 and Hsp90 with high affinity and interact with E2 enzymes, performing E3 ligase activity. The data allowed to reveal the pattern of plant Hsp70 and Hsp90 ubiquitination and described which plant E2 enzymes are likely involved in SbCHIP-mediated ubiquitination. Aditionally, we obtained information on the SbCHIP conformation, showing that it is a non-globular symmetric dimer and allowing to put forward a model for the interaction of SbCHIP with chaperones and E2 enzymes that suggests a mechanism of ubiquitination. Altogether, the results presented here are useful additions to the study of protein folding and degradation in plants.
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Affiliation(s)
| | - Glaucia M S Pinheiro
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, SP 13083-970, Brazil
| | - Käthe M Dahlström
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, SP 13083-970, Brazil
| | - Dênio E P Souto
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, SP 13083-970, Brazil
| | - Lauro T Kubota
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, SP 13083-970, Brazil
| | - Leandro R S Barbosa
- Institute of Physics, University of São Paulo-USP, São Paulo, SP 05508-090, Brazil
| | - Carlos H I Ramos
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, SP 13083-970, Brazil.
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Avelange-Macherel MH, Rolland A, Hinault MP, Tolleter D, Macherel D. The Mitochondrial Small Heat Shock Protein HSP22 from Pea is a Thermosoluble Chaperone Prone to Co-Precipitate with Unfolding Client Proteins. Int J Mol Sci 2019; 21:E97. [PMID: 31877784 PMCID: PMC6981728 DOI: 10.3390/ijms21010097] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 12/19/2019] [Accepted: 12/19/2019] [Indexed: 12/26/2022] Open
Abstract
The small heat shock proteins (sHSPs) are molecular chaperones that share an alpha-crystallin domain but display a high diversity of sequence, expression, and localization. They are especially prominent in plants, populating most cellular compartments. In pea, mitochondrial HSP22 is induced by heat or oxidative stress in leaves but also strongly accumulates during seed development. The molecular function of HSP22 was addressed by studying the effect of temperature on its structural properties and chaperone effects using a recombinant or native protein. Overexpression of HSP22 significantly increased bacterial thermotolerance. The secondary structure of the recombinant protein was not affected by temperature in contrast with its quaternary structure. The purified protein formed large polydisperse oligomers that dissociated upon heating (42 °C) into smaller species (mainly monomers). The recombinant protein appeared thermosoluble but precipitated with thermosensitive proteins upon heat stress in assays either with single protein clients or within complex extracts. As shown by in vitro protection assays, HSP22 at high molar ratio could partly prevent the heat aggregation of rhodanese but not of malate dehydrogenase. HSP22 appears as a holdase that could possibly prevent the aggregation of some proteins while co-precipitating with others to facilitate their subsequent refolding by disaggregases or clearance by proteases.
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Affiliation(s)
| | | | | | | | - David Macherel
- IRHS, Agrocampus-Ouest, INRA, Université d’Angers, SFR 4207 Quasav, 42 rue George Morel, 49071 Beaucouzé, France; (M.-H.A.-M.)
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