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Wickramaratne AC, Wickner S, Kravats AN. Hsp90, a team player in protein quality control and the stress response in bacteria. Microbiol Mol Biol Rev 2024:e0017622. [PMID: 38534118 DOI: 10.1128/mmbr.00176-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024] Open
Abstract
SUMMARYHeat shock protein 90 (Hsp90) participates in proteostasis by facilitating protein folding, activation, disaggregation, prevention of aggregation, degradation, and protection against degradation of various cellular proteins. It is highly conserved from bacteria to humans. In bacteria, protein remodeling by Hsp90 involves collaboration with the Hsp70 molecular chaperone and Hsp70 cochaperones. In eukaryotes, protein folding by Hsp90 is more complex and involves collaboration with many Hsp90 cochaperones as well as Hsp70 and Hsp70 cochaperones. This review focuses primarily on bacterial Hsp90 and highlights similarities and differences between bacterial and eukaryotic Hsp90. Seminal research findings that elucidate the structure and the mechanisms of protein folding, disaggregation, and reactivation promoted by Hsp90 are discussed. Understanding the mechanisms of bacterial Hsp90 will provide fundamental insight into the more complex eukaryotic chaperone systems.
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Affiliation(s)
- Anushka C Wickramaratne
- Laboratory of Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Sue Wickner
- Laboratory of Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Andrea N Kravats
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio, USA
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2
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Wang Y, Wang X, Wu H, Wang L, Wang H, Lu Z. Characterization of Hsp17, a Novel Small Heat Shock Protein, in Sphingomonas melonis TY under Heat Stress. Microbiol Spectr 2023; 11:e0136023. [PMID: 37436164 PMCID: PMC10434288 DOI: 10.1128/spectrum.01360-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 06/24/2023] [Indexed: 07/13/2023] Open
Abstract
Bacteria are constantly exposed to a variety of environmental stresses. Temperature is considered one of the most important environmental factors affecting microbial growth and survival. As ubiquitous environmental microorganisms, Sphingomonas species play essential roles in the biodegradation of organic contaminants, plant protection, and environmental remediation. Understanding the mechanism by which they respond to heat shock will help further improve cell resistance by applying synthetic biological strategies. Here, we assessed the transcriptomic and proteomic responses of Sphingomonas melonis TY to heat shock and found that stressful conditions caused significant changes in functional genes related to protein synthesis at the transcriptional level. The most notable changes observed were increases in the transcription (1,857-fold) and protein expression (11-fold) of Hsp17, which belongs to the small heat shock protein family, and the function of Hsp17 in heat stress was further investigated in this study. We found that the deletion of hsp17 reduced the capacity of the cells to tolerate high temperatures, whereas the overexpression of hsp17 significantly enhanced the ability of the cells to withstand high temperatures. Moreover, the heterologous expression of hsp17 in Escherichia coli DH5α conferred to the bacterium the ability to resist heat stress. Interestingly, its cells were elongated and formed connected cells following the increase in temperature, while hsp17 overexpression restored their normal morphology under high temperature. In general, these results indicate that the novel small heat shock protein Hsp17 greatly contributes to maintaining cell viability and morphology under stress conditions. IMPORTANCE Temperature is generally considered the most important factor affecting metabolic functions and the survival of microbes. As molecular chaperones, small heat shock proteins can prevent damaged protein aggregation during abiotic stress, especially heat stress. Sphingomonas species are widely distributed in nature, and they can frequently be found in various extreme environments. However, the role of small heat shock proteins in Sphingomonas under high-temperature stress has not been elucidated. This study greatly enhances our understanding of a novel identified protein, Hsp17, in S. melonis TY in terms of its ability to resist heat stress and maintain cell morphology under high temperature, leading to a broader understanding of how microbes adapt to environmental extremes. Furthermore, our study will provide potential heat resistance elements for further enhancing cellular resistance as well as the synthetic biological applications of Sphingomonas.
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Affiliation(s)
- Yihan Wang
- MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, China
- Cancer Center, Zhejiang University, Hangzhou, China
| | - Xiaoyu Wang
- MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, China
- Cancer Center, Zhejiang University, Hangzhou, China
| | - Hao Wu
- MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, China
- Cancer Center, Zhejiang University, Hangzhou, China
| | - Lvjing Wang
- MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, China
- Cancer Center, Zhejiang University, Hangzhou, China
| | - Haixia Wang
- MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Zhenmei Lu
- MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, China
- Cancer Center, Zhejiang University, Hangzhou, China
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3
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Fan Y, Murgia M, Linder MI, Mizoguchi Y, Wang C, Łyszkiewicz M, Ziȩtara N, Liu Y, Frenz S, Sciuccati G, Partida-Gaytan A, Alizadeh Z, Rezaei N, Rehling P, Dennerlein S, Mann M, Klein C. HAX1-dependent control of mitochondrial proteostasis governs neutrophil granulocyte differentiation. J Clin Invest 2022; 132:153153. [PMID: 35499078 PMCID: PMC9057593 DOI: 10.1172/jci153153] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 03/10/2022] [Indexed: 01/18/2023] Open
Abstract
The relevance of molecular mechanisms governing mitochondrial proteostasis to the differentiation and function of hematopoietic and immune cells is largely elusive. Through dissection of the network of proteins related to HCLS1-associated protein X-1, we defined a potentially novel functional CLPB/HAX1/(PRKD2)/HSP27 axis with critical importance for the differentiation of neutrophil granulocytes and, thus, elucidated molecular and metabolic mechanisms underlying congenital neutropenia in patients with HAX1 deficiency as well as bi- and monoallelic mutations in CLPB. As shown by stable isotope labeling by amino acids in cell culture (SILAC) proteomics, CLPB and HAX1 control the balance of mitochondrial protein synthesis and persistence crucial for proper mitochondrial function. Impaired mitochondrial protein dynamics are associated with decreased abundance of the serine-threonine kinase PRKD2 and HSP27 phosphorylated on serines 78 and 82. Cellular defects in HAX1–/– cells can be functionally reconstituted by HSP27. Thus, mitochondrial proteostasis emerges as a critical molecular and metabolic mechanism governing the differentiation and function of neutrophil granulocytes.
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Affiliation(s)
- Yanxin Fan
- Department of Pediatrics, Dr. von Hauner Children’s Hospital and Gene Center, University Hospital, Ludwig-Maximilians-Universität (LMU), Munich, Germany
| | - Marta Murgia
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany
- Department of Biomedical Sciences, University of Padua, Padua, Italy
| | - Monika I. Linder
- Department of Pediatrics, Dr. von Hauner Children’s Hospital and Gene Center, University Hospital, Ludwig-Maximilians-Universität (LMU), Munich, Germany
| | - Yoko Mizoguchi
- Department of Pediatrics, Dr. von Hauner Children’s Hospital and Gene Center, University Hospital, Ludwig-Maximilians-Universität (LMU), Munich, Germany
| | - Cong Wang
- Department of Cellular Biochemistry, University Medical Center Goettingen, Goettingen, Germany
| | - Marcin Łyszkiewicz
- Department of Pediatrics, Dr. von Hauner Children’s Hospital and Gene Center, University Hospital, Ludwig-Maximilians-Universität (LMU), Munich, Germany
| | - Natalia Ziȩtara
- Department of Pediatrics, Dr. von Hauner Children’s Hospital and Gene Center, University Hospital, Ludwig-Maximilians-Universität (LMU), Munich, Germany
| | - Yanshan Liu
- Department of Pediatrics, Dr. von Hauner Children’s Hospital and Gene Center, University Hospital, Ludwig-Maximilians-Universität (LMU), Munich, Germany
| | - Stephanie Frenz
- Department of Pediatrics, Dr. von Hauner Children’s Hospital and Gene Center, University Hospital, Ludwig-Maximilians-Universität (LMU), Munich, Germany
| | - Gabriela Sciuccati
- Hematology and Oncology Department, Hospital de Pediatria “Prof. Dr. J.P. Garrahan,” Buenos Aires, Argentina
| | - Armando Partida-Gaytan
- Unidad de Investigación en Inmunodeficiencias Primarias, Instituto Nacional de Pediatría, Mexico City, Mexico
| | | | - Nima Rezaei
- Research Center for Immunodeficiencies, Children’s Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Peter Rehling
- Department of Cellular Biochemistry, University Medical Center Goettingen, Goettingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells,” University of Goettingen, Goettingen, Germany
- Max Planck Institute for Biophysical Chemistry, Goettingen, Germany
| | - Sven Dennerlein
- Department of Cellular Biochemistry, University Medical Center Goettingen, Goettingen, Germany
| | - Matthias Mann
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Christoph Klein
- Department of Pediatrics, Dr. von Hauner Children’s Hospital and Gene Center, University Hospital, Ludwig-Maximilians-Universität (LMU), Munich, Germany
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4
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Matavacas J, von Wachenfeldt C. Update on the Protein Homeostasis Network in Bacillus subtilis. Front Microbiol 2022; 13:865141. [PMID: 35350626 PMCID: PMC8957991 DOI: 10.3389/fmicb.2022.865141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Accepted: 02/15/2022] [Indexed: 11/13/2022] Open
Abstract
Protein homeostasis is fundamental to cell function and survival. It relies on an interconnected network of processes involving protein synthesis, folding, post-translational modification and degradation as well as regulators of these processes. Here we provide an update on the roles, regulation and subcellular localization of the protein homeostasis machinery in the Gram-positive model organism Bacillus subtilis. We discuss emerging ideas and current research gaps in the field that, if tackled, increase our understanding of how Gram-positive bacteria, including several human pathogens, maintain protein homeostasis and cope with stressful conditions that challenge their survival.
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Lo HH, Chang HC, Liao CT, Hsiao YM. Expression and function of clpS and clpA in Xanthomonas campestris pv. campestris. Antonie van Leeuwenhoek 2022; 115:589-607. [PMID: 35322326 DOI: 10.1007/s10482-022-01725-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Accepted: 03/02/2022] [Indexed: 10/18/2022]
Abstract
ATP-dependent proteases (FtsH, Lon, and Clp family proteins) are ubiquitous in bacteria and play essential roles in numerous regulatory cell processes. Xanthomonas campestris pv. campestris is a Gram-negative pathogen that can cause black rot diseases in crucifers. The genome of X. campestris pv. campestris has several clp genes, namely, clpS, clpA, clpX, clpP, clpQ, and clpY. Among these genes, only clpX and clpP is known to be required for pathogenicity. Here, we focused on two uncharacterized clp genes (clpS and clpA) that encode the adaptor (ClpS) and ATPase subunit (ClpA) of the ClpAP protease complex. Transcriptional analysis revealed that the expression of clpS and clpA was growth phase-dependent and affected by the growth temperature. The inactivation of clpA, but not of clpS, resulted in susceptibility to high temperature and attenuated virulence in the host plant. The altered phenotypes of the clpA mutant could be complemented in trans. Site-directed mutagenesis revealed that K223 and K504 were the amino acid residues critical for ClpA function in heat tolerance. The protein expression profile shown by the clpA mutant in response to heat stress was different from that exhibited by the wild type. In summary, we characterized two clp genes (clpS and clpA) by examining their expression profiles and functions in different processes, including stress tolerance and pathogenicity. We demonstrated that clpS and clpA were expressed in a temperature-dependent manner and that clpA was required for the survival at high temperature and full virulence of X. campestris pv. campestris. This work represents the first time that clpS and clpA were characterized in Xanthomonas.
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Affiliation(s)
- Hsueh-Hsia Lo
- Department of Medical Laboratory Science and Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan
| | - Hsiao-Ching Chang
- Department of Medical Laboratory Science and Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan
| | - Chao-Tsai Liao
- Department of Medical Laboratory Science and Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan
| | - Yi-Min Hsiao
- Department of Medical Laboratory Science and Biotechnology, Central Taiwan University of Science and Technology, Taichung, 40601, Taiwan.
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6
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Dong T, Wang W, Xia M, Liang S, Hu G, Ye H, Cao Q, Dong Z, Zhang C, Feng D, Zuo J. Involvement of the Heat Shock Protein HtpG of Salmonella Typhimurium in Infection and Proliferation in Hosts. Front Cell Infect Microbiol 2021; 11:758898. [PMID: 34869065 PMCID: PMC8635147 DOI: 10.3389/fcimb.2021.758898] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Accepted: 10/25/2021] [Indexed: 12/04/2022] Open
Abstract
Salmonella Typhimurium is a common pathogen infecting the gastrointestinal tract of humans and animals, causing host gastroenteritis and typhoid fever. Heat shock protein (HtpG) as a molecular chaperone is involved in the various cellular processes of bacteria, especially under environmental stress. However, the potential association of HtpG with S. Typhimurium infection remains unknown. In this study, we clarified that HtpG could also play a role as an effector in S. Typhimurium infection. RNA-seq indicated that the flagellar assembly pathway, infection pathway, and chemotaxis pathway genes of S. Typhimurium were downregulated after the mutation of HtpG, which resulted in compromises of S. Typhimurium motility, biofilm formation, adhesion, invasion, and inflammation-inducing ability. In addition, HtpG recombinant protein was capable of promoting the proliferation of S. Typhimurium in host cells and the resultant inflammation. Collectively, our results illustrated an important role of HtpG in S. Typhimurium infection.
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Affiliation(s)
- Tao Dong
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
| | - Weiwei Wang
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
| | - Minhao Xia
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
| | - Shujie Liang
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
| | - Guangzhong Hu
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
| | - Hui Ye
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
| | - Qingyun Cao
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
| | - Zemin Dong
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
| | - Changming Zhang
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
| | - Dingyuan Feng
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
| | - Jianjun Zuo
- College of Animal Science, South China Agricultural University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Animal Nutritional Control, Guangzhou, China
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7
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Adaptive remodelling of blue pigmenting Pseudomonas fluorescens pf59 proteome in response to different environmental conditions. Food Control 2021. [DOI: 10.1016/j.foodcont.2021.108105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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8
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Fauvet B, Finka A, Castanié-Cornet MP, Cirinesi AM, Genevaux P, Quadroni M, Goloubinoff P. Bacterial Hsp90 Facilitates the Degradation of Aggregation-Prone Hsp70-Hsp40 Substrates. Front Mol Biosci 2021; 8:653073. [PMID: 33937334 PMCID: PMC8082187 DOI: 10.3389/fmolb.2021.653073] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 03/17/2021] [Indexed: 01/27/2023] Open
Abstract
In eukaryotes, the 90-kDa heat shock proteins (Hsp90s) are profusely studied chaperones that, together with 70-kDa heat shock proteins (Hsp70s), control protein homeostasis. In bacteria, however, the function of Hsp90 (HtpG) and its collaboration with Hsp70 (DnaK) remains poorly characterized. To uncover physiological processes that depend on HtpG and DnaK, we performed comparative quantitative proteomic analyses of insoluble and total protein fractions from unstressed wild-type (WT) Escherichia coli and from knockout mutants ΔdnaKdnaJ (ΔKJ), ΔhtpG (ΔG), and ΔdnaKdnaJΔhtpG (ΔKJG). Whereas the ΔG mutant showed no detectable proteomic differences with wild-type, ΔKJ expressed more chaperones, proteases and ribosomes and expressed dramatically less metabolic and respiratory enzymes. Unexpectedly, we found that the triple mutant ΔKJG showed higher levels of metabolic and respiratory enzymes than ΔKJ, suggesting that bacterial Hsp90 mediates the degradation of aggregation-prone Hsp70-Hsp40 substrates. Further in vivo experiments suggest that such Hsp90-mediated degradation possibly occurs through the HslUV protease.
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Affiliation(s)
- Bruno Fauvet
- Department of Plant Molecular Biology (DBMV), University of Lausanne, Lausanne, Switzerland
| | - Andrija Finka
- Department of Ecology, Agronomy and Aquaculture, University of Zadar, Zadar, Croatia
| | - Marie-Pierre Castanié-Cornet
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Anne-Marie Cirinesi
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Pierre Genevaux
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Manfredo Quadroni
- Protein Analysis Facility, University of Lausanne, Lausanne, Switzerland
| | - Pierre Goloubinoff
- Department of Plant Molecular Biology (DBMV), University of Lausanne, Lausanne, Switzerland
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9
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Grindle MP, Carter B, Alao JP, Connors K, Tehver R, Kravats AN. Structural Communication between the E. coli Chaperones DnaK and Hsp90. Int J Mol Sci 2021; 22:ijms22042200. [PMID: 33672263 PMCID: PMC7926864 DOI: 10.3390/ijms22042200] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 02/10/2021] [Accepted: 02/12/2021] [Indexed: 01/03/2023] Open
Abstract
The 70 kDa and 90 kDa heat shock proteins Hsp70 and Hsp90 are two abundant and highly conserved ATP-dependent molecular chaperones that participate in the maintenance of cellular homeostasis. In Escherichia coli, Hsp90 (Hsp90Ec) and Hsp70 (DnaK) directly interact and collaborate in protein remodeling. Previous work has produced a model of the direct interaction of both chaperones. The locations of the residues involved have been confirmed and the model has been validated. In this study, we investigate the allosteric communication between Hsp90Ec and DnaK and how the chaperones couple their conformational cycles. Using elastic network models (ENM), normal mode analysis (NMA), and a structural perturbation method (SPM) of asymmetric and symmetric DnaK-Hsp90Ec, we extract biologically relevant vibrations and identify residues involved in allosteric signaling. When one DnaK is bound, the dominant normal modes favor biological motions that orient a substrate protein bound to DnaK within the substrate/client binding site of Hsp90Ec and release the substrate from the DnaK substrate binding domain. The presence of one DnaK molecule stabilizes the entire Hsp90Ec protomer to which it is bound. Conversely, the symmetric model of DnaK binding results in steric clashes of DnaK molecules and suggests that the Hsp90Ec and DnaK chaperone cycles operate independently. Together, this data supports an asymmetric binding of DnaK to Hsp90Ec.
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Affiliation(s)
- Matthew P. Grindle
- Department of Chemistry & Biochemistry, Miami University, Oxford, OH 45056, USA; (M.P.G.); (J.P.A.); (K.C.)
| | - Ben Carter
- Department of Physics, Denison University, Granville, OH 43023, USA; (B.C.); (R.T.)
| | - John Paul Alao
- Department of Chemistry & Biochemistry, Miami University, Oxford, OH 45056, USA; (M.P.G.); (J.P.A.); (K.C.)
| | - Katherine Connors
- Department of Chemistry & Biochemistry, Miami University, Oxford, OH 45056, USA; (M.P.G.); (J.P.A.); (K.C.)
| | - Riina Tehver
- Department of Physics, Denison University, Granville, OH 43023, USA; (B.C.); (R.T.)
| | - Andrea N. Kravats
- Department of Chemistry & Biochemistry, Miami University, Oxford, OH 45056, USA; (M.P.G.); (J.P.A.); (K.C.)
- Correspondence:
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10
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Fauvet B, Finka A, Castanié-Cornet MP, Cirinesi AM, Genevaux P, Quadroni M, Goloubinoff P. Bacterial Hsp90 Facilitates the Degradation of Aggregation-Prone Hsp70-Hsp40 Substrates. Front Mol Biosci 2021. [PMID: 33937334 DOI: 10.1101/451989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023] Open
Abstract
In eukaryotes, the 90-kDa heat shock proteins (Hsp90s) are profusely studied chaperones that, together with 70-kDa heat shock proteins (Hsp70s), control protein homeostasis. In bacteria, however, the function of Hsp90 (HtpG) and its collaboration with Hsp70 (DnaK) remains poorly characterized. To uncover physiological processes that depend on HtpG and DnaK, we performed comparative quantitative proteomic analyses of insoluble and total protein fractions from unstressed wild-type (WT) Escherichia coli and from knockout mutants ΔdnaKdnaJ (ΔKJ), ΔhtpG (ΔG), and ΔdnaKdnaJΔhtpG (ΔKJG). Whereas the ΔG mutant showed no detectable proteomic differences with wild-type, ΔKJ expressed more chaperones, proteases and ribosomes and expressed dramatically less metabolic and respiratory enzymes. Unexpectedly, we found that the triple mutant ΔKJG showed higher levels of metabolic and respiratory enzymes than ΔKJ, suggesting that bacterial Hsp90 mediates the degradation of aggregation-prone Hsp70-Hsp40 substrates. Further in vivo experiments suggest that such Hsp90-mediated degradation possibly occurs through the HslUV protease.
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Affiliation(s)
- Bruno Fauvet
- Department of Plant Molecular Biology (DBMV), University of Lausanne, Lausanne, Switzerland
| | - Andrija Finka
- Department of Ecology, Agronomy and Aquaculture, University of Zadar, Zadar, Croatia
| | - Marie-Pierre Castanié-Cornet
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Anne-Marie Cirinesi
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Pierre Genevaux
- Laboratoire de Microbiologie et de Génétique Moléculaires, Center de Biologie Intégrative, CNRS, Université de Toulouse, Toulouse, France
| | - Manfredo Quadroni
- Protein Analysis Facility, University of Lausanne, Lausanne, Switzerland
| | - Pierre Goloubinoff
- Department of Plant Molecular Biology (DBMV), University of Lausanne, Lausanne, Switzerland
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11
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Mapping the Transcriptional and Fitness Landscapes of a Pathogenic E. coli Strain: The Effects of Organic Acid Stress under Aerobic and Anaerobic Conditions. Genes (Basel) 2020; 12:genes12010053. [PMID: 33396416 PMCID: PMC7824302 DOI: 10.3390/genes12010053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 12/22/2020] [Accepted: 12/29/2020] [Indexed: 12/31/2022] Open
Abstract
Several methods are available to probe cellular responses to external stresses at the whole genome level. RNAseq can be used to measure changes in expression of all genes following exposure to stress, but gives no information about the contribution of these genes to an organism’s ability to survive the stress. The relative contribution of each non-essential gene in the genome to the fitness of the organism under stress can be obtained using methods that use sequencing to estimate the frequencies of members of a dense transposon library grown under different conditions, for example by transposon-directed insertion sequencing (TraDIS). These two methods thus probe different aspects of the underlying biology of the organism. We were interested to determine the extent to which the data from these two methods converge on related genes and pathways. To do this, we looked at a combination of biologically meaningful stresses. The human gut contains different organic short-chain fatty acids (SCFAs) produced by fermentation of carbon compounds, and Escherichia coli is exposed to these in its passage through the gut. Their effect is likely to depend on both the ambient pH and the level of oxygen present. We, therefore, generated RNAseq and TraDIS data on a uropathogenic E. coli strain grown at either pH 7 or pH 5.5 in the presence or absence of three SCFAs (acetic, propionic and butyric), either aerobically or anaerobically. Our analysis identifies both known and novel pathways as being likely to be important under these conditions. There is no simple correlation between gene expression and fitness, but we found a significant overlap in KEGG pathways that are predicted to be enriched following analysis of the data from the two methods, and the majority of these showed a fitness signature that would be predicted from the gene expression data, assuming expression to be adaptive. Genes which are not in the E. coli core genome were found to be particularly likely to show a positive correlation between level of expression and contribution to fitness.
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12
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Serna N, Cano-Garrido O, Sánchez JM, Sánchez-Chardi A, Sánchez-García L, López-Laguna H, Fernández E, Vázquez E, Villaverde A. Release of functional fibroblast growth factor-2 from artificial inclusion bodies. J Control Release 2020; 327:61-69. [DOI: 10.1016/j.jconrel.2020.08.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 06/21/2020] [Accepted: 08/04/2020] [Indexed: 12/11/2022]
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13
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Singh P, Khurana H, Yadav SP, Dhiman K, Singh P, Ashish, Singh R, Sharma D. Biochemical characterization of ClpB protein from Mycobacterium tuberculosis and identification of its small-molecule inhibitors. Int J Biol Macromol 2020; 165:375-387. [PMID: 32987071 DOI: 10.1016/j.ijbiomac.2020.09.131] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/25/2020] [Accepted: 09/18/2020] [Indexed: 12/14/2022]
Abstract
Tuberculosis, caused by pathogenic M. tuberculosis, remains a global health concern among various infectious diseases. Studies show that ClpB, a major disaggregase, protects the pathogen from various stresses encountered in the host environment. In the present study we have performed a detailed biophysical characterization of M. tuberculosis ClpB followed by a high throughput screening to identify small molecule inhibitors. The sedimentation velocity studies reveal that ClpB oligomerization varies with its concentration and presence of nucleotides. Further, using high throughput malachite green-based screening assay, we identified potential novel inhibitors of ClpB ATPase activity. The enzyme kinetics revealed that the lead molecule inhibits ClpB activity in a competitive manner. These drugs were also able to inhibit ATPase activity associated with E. coli ClpB and yeast Hsp104. The identified drugs inhibited the growth of intracellular bacteria in macrophages. Small angle X-ray scattering based modeling shows that ATP, and not its non-hydrolyzable analogs induce large scale conformational rearrangements in ClpB. Remarkably, the identified small molecules inhibited these ATP inducible conformational changes, suggesting that nucleotide induced shape changes are crucial for ClpB activity. The study broadens our understanding of M. tuberculosis chaperone machinery and provides the basis for designing more potent inhibitors against ClpB chaperone.
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Affiliation(s)
- Prashant Singh
- Council of Scientific and Industrial Research-Institute of Microbial Technology, India
| | - Harleen Khurana
- Tuberculosis Research Laboratory, Translational Health Science and Technology Institute, India
| | - Shiv Pratap Yadav
- Council of Scientific and Industrial Research-Institute of Microbial Technology, India
| | - Kanika Dhiman
- Council of Scientific and Industrial Research-Institute of Microbial Technology, India
| | - Padam Singh
- Tuberculosis Research Laboratory, Translational Health Science and Technology Institute, India
| | - Ashish
- Council of Scientific and Industrial Research-Institute of Microbial Technology, India
| | - Ramandeep Singh
- Tuberculosis Research Laboratory, Translational Health Science and Technology Institute, India
| | - Deepak Sharma
- Council of Scientific and Industrial Research-Institute of Microbial Technology, India.
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14
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Obuchowski I, Liberek K. Small but mighty: a functional look at bacterial sHSPs. Cell Stress Chaperones 2020; 25:593-600. [PMID: 32301005 PMCID: PMC7332594 DOI: 10.1007/s12192-020-01094-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/12/2020] [Indexed: 02/02/2023] Open
Abstract
Small heat shock proteins (sHSPs) are widespread in every kingdom of life, being indispensable for protein quality control networks. Alongside canonical chaperone functions, sHSPs seem to have been a very plastic scaffold for acquiring multiple related functions across evolution. This review aims to summarize what is known about sHSPs functioning in the Bacteria Kingdom.
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Affiliation(s)
- Igor Obuchowski
- Intercollegiate Faculty of Biotechnology UG-MUG, University of Gdansk, Abrahama 58, 80-307, Gdansk, Poland.
| | - Krzysztof Liberek
- Intercollegiate Faculty of Biotechnology UG-MUG, University of Gdansk, Abrahama 58, 80-307, Gdansk, Poland
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15
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Chernova LS, Bogachev MI, Chasov VV, Vishnyakov IE, Kayumov AR. N- and C-terminal regions of the small heat shock protein IbpA from Acholeplasma laidlawii competitively govern its oligomerization pattern and chaperone-like activity. RSC Adv 2020; 10:8364-8376. [PMID: 35497866 PMCID: PMC9050003 DOI: 10.1039/c9ra10172a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 02/18/2020] [Indexed: 12/11/2022] Open
Abstract
Small heat shock proteins (sHSPs) are ubiquitous molecular chaperones preventing the irreversible denaturation of proteins. While in Escherichia coli two sHSPs IbpA and IbpB work in strong cooperation, the sole Mollicute with free-living ability Acholeplasma laidlawii carries a single gene encoding the sHSP protein AlIbpA. In vitro, independently of the temperature, AlIbpA forms a heterogeneous mixture of approximately 24-mer globules, fibrils and huge protein aggregates. The removal of either 12 or 25 N-terminal amino acids led to the formation of fibrils and enhanced the protein ability to prevent the temperature-induced aggregation of insulin, assuming the fibrillar form as an active protein. In turn, the deletion of the C-terminus or substitution of C-terminal LEL motif by SEP decreased the temperature stability of AlIbpA and eliminated its chaperone function completely, although the protein remained predominantly in a globular state. This suggests that the C-terminal LEL motif is necessary for the chaperon-like activity of AlIbpA and fibril formation. Double N- and C-terminal truncations abolished both the chaperone-like activity and huge oligomer formation. Since the globular form of sHSPs is considered as their inactive form, our data suggest that the N-terminus of AlIbpA is responsible for the huge globule (low-active form) formation and behaves as an intramolecular inhibitor of the fibrils (active form) formation and substrates binding. Taken together these data demonstrate non-trivial properties of AlIbpA, in which the competitive action of N- and C-termini governs the equilibrium between either fibrillar or globular structures representing a possible molecular mechanism of the AlIbpA activity regulation. The CTD provides fibrils (active form) formation. The NTD leads to globules formation and behaves as an intramolecular inhibitor of CTD. Their competition governs the equilibrium between either fibrills or globules regulating the AlIbpA activity.![]()
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Affiliation(s)
- Liliya S Chernova
- Kazan Federal University 18 Kremlevskaya street 420008 Kazan Russia +7-843-233-78-02.,Institute of Cytology, Russian Academy of Sciences 4 Tikhoretsky Avenue 194064 St-Petersburg Russia +7-812-297-03-28
| | - Mikhail I Bogachev
- St. Petersburg Electrotechnical University 5 Professor Popov street 197376 St. Petersburg Russia
| | - Vitaly V Chasov
- Kazan Federal University 18 Kremlevskaya street 420008 Kazan Russia +7-843-233-78-02
| | - Innokentii E Vishnyakov
- Institute of Cytology, Russian Academy of Sciences 4 Tikhoretsky Avenue 194064 St-Petersburg Russia +7-812-297-03-28.,Peter the Great St.Petersburg Polytechnic University 29 Polytechnicheskaya street 195251 St-Petersburg Russia
| | - Airat R Kayumov
- Kazan Federal University 18 Kremlevskaya street 420008 Kazan Russia +7-843-233-78-02.,Institute of Cytology, Russian Academy of Sciences 4 Tikhoretsky Avenue 194064 St-Petersburg Russia +7-812-297-03-28
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16
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Carratalá JV, Cano-Garrido O, Sánchez J, Membrado C, Pérez E, Conchillo-Solé O, Daura X, Sánchez-Chardi A, Villaverde A, Arís A, Garcia-Fruitós E, Ferrer-Miralles N. Aggregation-prone peptides modulate activity of bovine interferon gamma released from naturally occurring protein nanoparticles. N Biotechnol 2020; 57:11-19. [PMID: 32028049 DOI: 10.1016/j.nbt.2020.02.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 01/24/2020] [Accepted: 02/02/2020] [Indexed: 12/28/2022]
Abstract
Efficient protocols for the production of recombinant proteins are indispensable for the development of the biopharmaceutical sector. Accumulation of recombinant proteins in naturally-occurring protein aggregates is detrimental to biopharmaceutical development. In recent years, the view of protein aggregates has changed with the recognition that they are a valuable source of functional recombinant proteins. In this study, bovine interferon-gamma (rBoIFN-γ) was engineered to enhance the formation of protein aggregates, also known as protein nanoparticles (NPs), by the addition of aggregation-prone peptides (APPs) in the generally recognized as safe (GRAS) bacterial Lactococcus lactis expression system. The L6K2, HALRU and CYOB peptides were selected to assess their intrinsic aggregation capability to nucleate protein aggregation. These APPs enhanced the tendency of the resulting protein to aggregate at the expense of total protein yield. However, fine physico-chemical characterization of the resulting intracellular protein NPs, the protein released from them and the protein purified from the soluble cell fraction indicated that the compactability of protein conformations was directly related to the biological activity of variants of IFN-γ, used here as a model protein with therapeutic potential. APPs enhanced the aggregation tendency of fused rBoIFN-γ while increasing compactability of protein species. Biological activity of rBoIFN-γ was favored in more compacted conformations. Naturally-occurring protein aggregates can be produced in GRAS microorganisms as protein depots of releasable active protein. The addition of APPs to enhance the aggregation tendency has a positive impact in overall compactability and functionality of resulting protein conformers.
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Affiliation(s)
- José Vicente Carratalá
- Institute for Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain
| | - Olivia Cano-Garrido
- Institute for Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain; Bioengineering, Biomaterials and Nanomedicine Networking Biomedical Research Centre (CIBER-BBN), Bellaterra, Barcelona, Spain
| | - Julieta Sánchez
- Institute for Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain
| | - Cristina Membrado
- Institute for Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain
| | - Eudald Pérez
- Institute for Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain
| | - Oscar Conchillo-Solé
- Institute for Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain
| | - Xavier Daura
- Institute for Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain; Catalan Institution for Research and Advanced Studies, Barcelona, Spain
| | - Alejandro Sánchez-Chardi
- Microscopy Service, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain and Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Antonio Villaverde
- Institute for Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain; Bioengineering, Biomaterials and Nanomedicine Networking Biomedical Research Centre (CIBER-BBN), Bellaterra, Barcelona, Spain
| | - Anna Arís
- Department of Ruminant Production, Institute of Agrifood Research and Technology (IRTA), Caldes de Montbui, Barcelona, Spain
| | - Elena Garcia-Fruitós
- Department of Ruminant Production, Institute of Agrifood Research and Technology (IRTA), Caldes de Montbui, Barcelona, Spain
| | - Neus Ferrer-Miralles
- Institute for Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, Barcelona, Spain; Bioengineering, Biomaterials and Nanomedicine Networking Biomedical Research Centre (CIBER-BBN), Bellaterra, Barcelona, Spain.
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17
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Genome engineering of E. coli for improved styrene production. Metab Eng 2020; 57:74-84. [DOI: 10.1016/j.ymben.2019.09.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 08/18/2019] [Accepted: 09/12/2019] [Indexed: 01/01/2023]
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18
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Vinay TN, Ray AK, Avunje S, Thangaraj SK, Krishnappa H, Viswanathan B, Reddy MA, Vijayan KK, Patil PK. Vibrio harveyi biofilm as immunostimulant candidate for high-health pacific white shrimp, Penaeus vannamei farming. FISH & SHELLFISH IMMUNOLOGY 2019; 95:498-505. [PMID: 31698068 DOI: 10.1016/j.fsi.2019.11.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 10/26/2019] [Accepted: 11/01/2019] [Indexed: 06/10/2023]
Abstract
The study was to develop Vibrio harveyi biofilm-based novel microbial product and its oral delivery for high health Penaeus vannamei farming. Yield of bacterial biofilm was optimized on chitin substrate (size: <360, 360-850 and 850-1250 μm; concentration: 0.3, 0.6 and 0.9%) in tryptone soy broth (0.15%). The biofilm was characterized by crystal violet assay, SEM and LSCM imaging; protein profiling by SDS-PAGE and LC-ESI-MS/MS. The immune stimulatory effect of the biofilm in yard experiments was evaluated by relative quantification of immune genes using real-time PCR effect on overall improvement on health status under field trials. The highest biofilm yield (6.13 ± 0.2 × 107 cfu/ml) was obtained at 0.6% of <360 μm chitin substrate. The biofilm formation was stabilized by 96 h of incubation at 30 °C. Protein profiling confirmed expression of six additional proteins (SDS-PAGE) and 11 proteins were differentially expressed (LC-ESI-MS/MS) in biofilm cells over free cells of V. harveyi. Oral administration of the biofilm for 48 h confirmed to enhance expression of antimicrobial peptides, penaeidin, crustin and lysozyme in P. vannamei. Further Oral administration of biofilm for two weeks to P. vannamei (1.8 ± 0.13 g) improved the growth (2.66 ± 0.06 g) and survival (84.44 ± 1.82%) compared to control (2.15 ± 0.03 g; 70.94 ± 0.66%) Nursery trials showed a significant reduction in occurrence of anatomical deformities like antenna cut (12.67 ± 0.66%), rostrum cut (4.66 ± 0.87%), and tail rot (3.33 ± 0.88%), compared to animals fed with normal diet which was 24.33 ± 2.72; 14 ± 1.52 and 10.66 ± 1.45% respectively. In vitro and in vivo studies suggest inactivated biofilm cells of V. harveyi on chitin substrate express additional antigenic proteins and when administered orally through feed at regular intervals stimulates immune response and improve growth, survival and health status of shrimp.
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Affiliation(s)
| | - Arvind Kumar Ray
- ICAR-Central Institute of Brackishwater Aquaculture, Chennai, India
| | - Satheesha Avunje
- ICAR-Central Institute of Brackishwater Aquaculture, Chennai, India
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19
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Hews CL, Pritchard EJ, Rowley G. The Salmonella Specific, σ E-Regulated, STM1250 and AgsA, Function With the sHsps IbpA and IbpB, to Counter Oxidative Stress and Survive Macrophage Killing. Front Cell Infect Microbiol 2019; 9:263. [PMID: 31396489 PMCID: PMC6663981 DOI: 10.3389/fcimb.2019.00263] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 07/04/2019] [Indexed: 11/13/2022] Open
Abstract
The host presents an array of environments which induce bacterial stress including changes in pH, antimicrobial compounds and reactive oxygen species. The bacterial envelope sits at the interface between the intracellular and extracellular environment and its maintenance is essential for Salmonella cell viability under a range of conditions, including during infection. In this study, we aimed to understand the contribution of the σH- and σE-regulated small heat shock proteins IbpA, IbpB, and AgsA and the putative σE-regulated stress response protein STM1250 to the Salmonella envelope stress response. Due to shared sequence identity, regulatory overlap, and the specificity of STM1250 and AgsA to Salmonella sp., we hypothesized that functional overlap exists between these four stress response proteins, which might afford a selective advantage during Salmonella exposure to stress. We present here new roles for three small heat shock proteins and a putative stress response protein in Salmonella that are not limited to heat shock. We have shown that, compared to WT, a quadruple mutant is significantly more sensitive to hydrogen peroxide, has a lower minimum bactericidal concentration to the cationic antimicrobial peptide polymyxin B, and is attenuated in macrophages.
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Affiliation(s)
- Claire L Hews
- School of Biological Sciences, University of East Anglia, Norwich, United Kingdom
| | - Emily J Pritchard
- School of Biological Sciences, University of East Anglia, Norwich, United Kingdom
| | - Gary Rowley
- School of Biological Sciences, University of East Anglia, Norwich, United Kingdom
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20
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Hsp90 of E. coli modulates assembly of FtsZ, the bacterial tubulin homolog. Proc Natl Acad Sci U S A 2019; 116:12285-12294. [PMID: 31160467 DOI: 10.1073/pnas.1904014116] [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] [Indexed: 12/14/2022] Open
Abstract
Heat shock protein 90 (Hsp90) is a highly conserved molecular chaperone involved in ATP-dependent client protein remodeling and activation. It also functions as a protein holdase, binding and stabilizing clients in an ATP-independent process. Hsp90 remodels over 300 client proteins and is essential for cell survival in eukaryotes. In bacteria, Hsp90 is a highly abundant protein, although very few clients have been identified and it is not essential for growth in many bacterial species. We previously demonstrated that in Escherichia coli, Hsp90 causes cell filamentation when expressed at high levels. Here, we have explored the cause of filamentation and identified a potentially important client of E. coli Hsp90 (Hsp90Ec), FtsZ. We observed that FtsZ, a bacterial tubulin homolog essential for cell division, fails to assemble into FtsZ rings (divisomes) in cells overexpressing Hsp90Ec Additionally, Hsp90Ec interacts with FtsZ and inhibits polymerization of FtsZ in vitro, in an ATP-independent holding reaction. The FtsZ-Hsp90Ec interaction involves residues in the client-binding region of Hsp90Ec and in the C-terminal tail of FtsZ, where many cell-division proteins and regulators interact. We observed that E. coli deleted for the Hsp90Ec gene htpG turn over FtsZ more rapidly than wild-type cells. Additionally, the length of ΔhtpG cells is reduced compared to wild-type cells. Altogether, these results suggest that Hsp90Ec is a modulator of cell division, and imply that the polypeptide-holding function of Hsp90 may be a biologically important chaperone activity.
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21
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Intermolecular Interactions between Hsp90 and Hsp70. J Mol Biol 2019; 431:2729-2746. [PMID: 31125567 DOI: 10.1016/j.jmb.2019.05.026] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 05/14/2019] [Accepted: 05/15/2019] [Indexed: 12/27/2022]
Abstract
Members of the Hsp90 and Hsp70 families of molecular chaperones are imp\ortant for the maintenance of protein homeostasis and cellular recovery following environmental stresses, such as heat and oxidative stress. Moreover, the two chaperones can collaborate in protein remodeling and activation. In higher eukaryotes, Hsp90 and Hsp70 form a functionally active complex with Hop (Hsp90-Hsp70 organizing protein) acting as a bridge between the two chaperones. In bacteria, which do not contain a Hop homolog, Hsp90 and Hsp70, DnaK, directly interact during protein remodeling. Although yeast possesses a Hop-like protein, Sti1, Hsp90, and Hsp70 can directly interact in yeast in the absence of Sti1. Previous studies showed that residues in the middle domain of Escherichia coli Hsp90 are important for interaction with the J-protein binding region of DnaK. The results did not distinguish between the possibility that (i) these sites were involved in direct interaction and (ii) the residues in these sites participate in conformational changes which are transduced to other sites on Hsp90 and DnaK that are involved in the direct interaction. Here we show by crosslinking experiments that the direct interaction is between a site in the middle domain of Hsp90 and the J-protein binding site of Hsp70 in both E. coli and yeast. Moreover, J-protein promotes the Hsp70-Hsp90 interaction in the presence of ATP, likely by converting Hsp70 into the ADP-bound conformation. The identification of the protein-protein interaction site is anticipated to lead to a better understanding of the collaboration between the two chaperones in protein remodeling.
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22
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Zhou D, Li Y, Wang X, Xie F, Chen D, Ma B, Li Y. Mesorhizobium huakuii HtpG Interaction with nsLTP AsE246 Is Required for Symbiotic Nitrogen Fixation. PLANT PHYSIOLOGY 2019; 180:509-528. [PMID: 30765481 PMCID: PMC6501076 DOI: 10.1104/pp.18.00336] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 02/04/2019] [Indexed: 05/06/2023]
Abstract
Plant nonspecific lipid transfer proteins (nsLTPs) are involved in a number of biological processes including root nodule symbiosis. However, the role of nsLTPs in legume-rhizobium symbiosis remains poorly understood, and no rhizobia proteins that interact with nsLTPs have been reported to date. In this study, we used a bacteria two-hybrid system and identified the high temperature protein G (HtpG) from Mesorhizobium huakuii that interacts with the nsLTP AsE246. The interaction between HtpG and AsE246 was confirmed by far-Western blotting and bimolecular fluorescence complementation. Our results indicated that the heat shock protein 90 (HSP90) domain of HtpG mediates the HtpG-AsE246 interaction. Immunofluorescence assay showed that HtpG was colocalized with AsE246 in infected nodule cells and symbiosome membranes. Expression of the htpG gene was relatively higher in young nodules and was highly expressed in the infection zones. Further investigation showed that htpG expression affects lipid abundance and profiles in root nodules and plays an essential role in nodule development and nitrogen fixation. Our findings provide further insights into the functional mechanisms behind the transport of symbiosome lipids via nsLTPs in root nodules.
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Affiliation(s)
- Donglai Zhou
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Yanan Li
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Xuting Wang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Fuli Xie
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Dasong Chen
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Binguang Ma
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Youguo Li
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
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23
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Song W, Joo M, Yeom JH, Shin E, Lee M, Choi HK, Hwang J, Kim YI, Seo R, Lee JE, Moore CJ, Kim YH, Eyun SI, Hahn Y, Bae J, Lee K. Divergent rRNAs as regulators of gene expression at the ribosome level. Nat Microbiol 2019; 4:515-526. [DOI: 10.1038/s41564-018-0341-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 12/05/2018] [Indexed: 01/21/2023]
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24
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Hantke I, Schäfer H, Janczikowski A, Turgay K. YocM a small heat shock protein can protect Bacillus subtilis cells during salt stress. Mol Microbiol 2018; 111:423-440. [PMID: 30431188 DOI: 10.1111/mmi.14164] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/28/2018] [Indexed: 12/17/2022]
Abstract
Small heat shock proteins (sHsp) occur in all domains of life. By interacting with misfolded or aggregated proteins these chaperones fulfill a protective role in cellular protein homeostasis. Here, we demonstrate that the sHsp YocM of the Gram-positive model organism Bacillus subtilis is part of the cellular protein quality control system with a specific role in salt stress response. In the absence of YocM the survival of salt shocked cells is impaired, and increased levels of YocM protect B. subtilis exposed to heat or salt. We observed a salt and heat stress-induced localization of YocM to intracellular protein aggregates. Interestingly, purified YocM appears to accelerate protein aggregation of different model substrates in vitro. In addition, the combined presence of YocM and chemical chaperones, which accumulate in salt stressed cells, can facilitate in vitro a synergistic protective effect on protein misfolding. Therefore, the beneficial role of YocM during salt stress could be related to a mutual functional relationship with chemical chaperones and adds a new possible functional aspect to sHsp chaperone activities.
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Affiliation(s)
- Ingo Hantke
- Institut für Mikrobiologie der Universität Hannover, Leibniz-Universität Hannover, Hannover, Germany
| | - Heinrich Schäfer
- Institut für Mikrobiologie der Universität Hannover, Leibniz-Universität Hannover, Hannover, Germany
| | - Armgard Janczikowski
- Institut für Mikrobiologie der Universität Hannover, Leibniz-Universität Hannover, Hannover, Germany
| | - Kürşad Turgay
- Institut für Mikrobiologie der Universität Hannover, Leibniz-Universität Hannover, Hannover, Germany
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25
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Genest O, Wickner S, Doyle SM. Hsp90 and Hsp70 chaperones: Collaborators in protein remodeling. J Biol Chem 2018; 294:2109-2120. [PMID: 30401745 DOI: 10.1074/jbc.rev118.002806] [Citation(s) in RCA: 180] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Heat shock proteins 90 (Hsp90) and 70 (Hsp70) are two families of highly conserved ATP-dependent molecular chaperones that fold and remodel proteins. Both are important components of the cellular machinery involved in protein homeostasis and participate in nearly every cellular process. Although Hsp90 and Hsp70 each carry out some chaperone activities independently, they collaborate in other cellular remodeling reactions. In eukaryotes, both Hsp90 and Hsp70 function with numerous Hsp90 and Hsp70 co-chaperones. In contrast, bacterial Hsp90 and Hsp70 are less complex; Hsp90 acts independently of co-chaperones, and Hsp70 uses two co-chaperones. In this review, we focus on recent progress toward understanding the basic mechanisms of Hsp90-mediated protein remodeling and the collaboration between Hsp90 and Hsp70, with an emphasis on bacterial chaperones. We describe the structure and conformational dynamics of these chaperones and their interactions with each other and with client proteins. The physiological roles of Hsp90 in Escherichia coli and other bacteria are also discussed. We anticipate that the information gained from exploring the mechanism of the bacterial chaperone system will provide the groundwork for understanding the more complex eukaryotic Hsp90 system and its modulation by Hsp90 co-chaperones.
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Affiliation(s)
- Olivier Genest
- From the Aix Marseille Univ, CNRS, Laboratoire de Bioénergétique et Ingénierie des Protéines, 13402 Marseille, France and
| | - Sue Wickner
- the Laboratory of Molecular Biology, NCI, National Institutes of Health, Bethesda, Maryland 20892
| | - Shannon M Doyle
- the Laboratory of Molecular Biology, NCI, National Institutes of Health, Bethesda, Maryland 20892
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26
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Sugita S, Watanabe K, Hashimoto K, Niwa T, Uemura E, Taguchi H, Watanabe YH. Electrostatic interactions between middle domain motif-1 and the AAA1 module of the bacterial ClpB chaperone are essential for protein disaggregation. J Biol Chem 2018; 293:19228-19239. [PMID: 30327424 DOI: 10.1074/jbc.ra118.005496] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 10/11/2018] [Indexed: 11/06/2022] Open
Abstract
ClpB, a bacterial homologue of heat shock protein 104 (Hsp104), can disentangle aggregated proteins with the help of the DnaK, a bacterial Hsp70, and its co-factors. As a member of the expanded superfamily of ATPases associated with diverse cellular activities (AAA+), ClpB forms a hexameric ring structure, with each protomer containing two AAA+ modules, AAA1 and AAA2. A long coiled-coil middle domain (MD) is present in the C-terminal region of the AAA1 and surrounds the main body of the ring. The MD is subdivided into two oppositely directed short coiled-coils, called motif-1 and motif-2. The MD represses the ATPase activity of ClpB, and this repression is reversed by the binding of DnaK to motif-2. To better understand how the MD regulates ClpB activity, here we investigated the roles of motif-1 in ClpB from Thermus thermophilus (TClpB). Using systematic alanine substitution of the conserved charged residues, we identified functionally important residues in motif-1, and using a photoreactive cross-linker and LC-MS/MS analysis, we further explored potential interacting residues. Moreover, we constructed TClpB mutants in which functionally important residues in motif-1 and in other candidate regions were substituted by oppositely charged residues. These analyses revealed that the intra-subunit pair Glu-401-Arg-532 and the inter-subunit pair Asp-404-Arg-180 are functionally important, electrostatically interacting pairs. Considering these structural findings, we conclude that the Glu-401-Arg-532 interaction shifts the equilibrium of the MD conformation to stabilize the activated form and that the Arg-180-Asp-404 interaction contributes to intersubunit signal transduction, essential for ClpB chaperone activities.
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Affiliation(s)
- Saori Sugita
- From the Department of Biology, Faculty of Science and Engineering and
| | - Kumiko Watanabe
- From the Department of Biology, Faculty of Science and Engineering and
| | - Kana Hashimoto
- From the Department of Biology, Faculty of Science and Engineering and
| | - Tatsuya Niwa
- the Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Eri Uemura
- the Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Hideki Taguchi
- the Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Yo-Hei Watanabe
- From the Department of Biology, Faculty of Science and Engineering and .,Institute for Integrative Neurobiology, Konan University, Okamoto 8-9-1, Kobe 658-8501 and
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27
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Govers SK, Mortier J, Adam A, Aertsen A. Protein aggregates encode epigenetic memory of stressful encounters in individual Escherichia coli cells. PLoS Biol 2018; 16:e2003853. [PMID: 30153247 PMCID: PMC6112618 DOI: 10.1371/journal.pbio.2003853] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 07/20/2018] [Indexed: 12/17/2022] Open
Abstract
Protein misfolding and aggregation are typically perceived as inevitable and detrimental processes tied to a stress- or age-associated decline in cellular proteostasis. A careful reassessment of this paradigm in the E. coli model bacterium revealed that the emergence of intracellular protein aggregates (PAs) was not related to cellular aging but closely linked to sublethal proteotoxic stresses such as exposure to heat, peroxide, and the antibiotic streptomycin. After removal of the proteotoxic stress and resumption of cellular proliferation, the polarly deposited PA was subjected to limited disaggregation and therefore became asymmetrically inherited for a large number of generations. Many generations after the original PA-inducing stress, the cells inheriting this ancestral PA displayed a significantly increased heat resistance compared to their isogenic, PA-free siblings. This PA-mediated inheritance of heat resistance could be reproduced with a conditionally expressed, intracellular PA consisting of an inert, aggregation-prone mutant protein, validating the role of PAs in increasing resistance and indicating that the resistance-conferring mechanism does not depend on the origin of the PA. Moreover, PAs were found to confer robustness to other proteotoxic stresses, as imposed by reactive oxygen species or streptomycin exposure, suggesting a broad protective effect. Our findings therefore reveal the potential of intracellular PAs to serve as long-term epigenetically inheritable and functional memory elements, physically referring to a previous cellular insult that occurred many generations ago and meanwhile improving robustness to a subsequent proteotoxic stress. The latter is presumably accomplished through the PA-mediated asymmetric inheritance of protein quality control components leading to their specific enrichment in PA-bearing cells.
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Affiliation(s)
- Sander K. Govers
- KU Leuven, Department of Microbial and Molecular Systems, Leuven, Belgium
| | - Julien Mortier
- KU Leuven, Department of Microbial and Molecular Systems, Leuven, Belgium
| | - Antoine Adam
- KU Leuven, Department of Computer Science, Leuven, Belgium
| | - Abram Aertsen
- KU Leuven, Department of Microbial and Molecular Systems, Leuven, Belgium
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28
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Uchihashi T, Watanabe YH, Nakazaki Y, Yamasaki T, Watanabe H, Maruno T, Ishii K, Uchiyama S, Song C, Murata K, Iino R, Ando T. Dynamic structural states of ClpB involved in its disaggregation function. Nat Commun 2018; 9:2147. [PMID: 29858573 PMCID: PMC5984625 DOI: 10.1038/s41467-018-04587-w] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 05/09/2018] [Indexed: 11/09/2022] Open
Abstract
The ATP-dependent bacterial protein disaggregation machine, ClpB belonging to the AAA+ superfamily, refolds toxic protein aggregates into the native state in cooperation with the cognate Hsp70 partner. The ring-shaped hexamers of ClpB unfold and thread its protein substrate through the central pore. However, their function-related structural dynamics has remained elusive. Here we directly visualize ClpB using high-speed atomic force microscopy (HS-AFM) to gain a mechanistic insight into its disaggregation function. The HS-AFM movies demonstrate massive conformational changes of the hexameric ring during ATP hydrolysis, from a round ring to a spiral and even to a pair of twisted half-spirals. HS-AFM observations of Walker-motif mutants unveil crucial roles of ATP binding and hydrolysis in the oligomer formation and structural dynamics. Furthermore, repressed and hyperactive mutations result in significantly different oligomeric forms. These results provide a comprehensive view for the ATP-driven oligomeric-state transitions that enable ClpB to disentangle protein aggregates. The bacterial protein disaggregation machine ClpB uses ATP to generate mechanical force to unfold and thread its protein substrates. Here authors visualize the ClpB ring using high-speed atomic force microscopy and capture conformational changes of the hexameric ring during the ATPase reaction.
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Affiliation(s)
- Takayuki Uchihashi
- Department of Physics and Structural Biology Research Center, Nagoya University, Chikusa-ku, Nagoya, 464-8602, Japan
| | - Yo-Hei Watanabe
- Department of Biology, Faculty of Science and Engineering, Konan University, Okamoto 8-9-1, Kobe, 658-8501, Japan. .,Institute for Integrative Neurobiology, Konan University, Okamoto 8-9-1, Kobe, 658-8501, Japan.
| | - Yosuke Nakazaki
- Department of Biology, Faculty of Science and Engineering, Konan University, Okamoto 8-9-1, Kobe, 658-8501, Japan.,Institute for Integrative Neurobiology, Konan University, Okamoto 8-9-1, Kobe, 658-8501, Japan
| | - Takashi Yamasaki
- Department of Biology, Faculty of Science and Engineering, Konan University, Okamoto 8-9-1, Kobe, 658-8501, Japan.,Institute for Integrative Neurobiology, Konan University, Okamoto 8-9-1, Kobe, 658-8501, Japan
| | - Hiroki Watanabe
- Department of Physics, College of Science and Engineering, Kanazawa University, Kanazawa, 920-1192, Japan
| | - Takahiro Maruno
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Osaka, 565-0871, Japan
| | - Kentaro Ishii
- Exploratory Research Center on Life and Living Systems (ExCELLS), National Institutes of Natural Sciences, Okazaki, Aichi, 444-8787, Japan
| | - Susumu Uchiyama
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Osaka, 565-0871, Japan.,Exploratory Research Center on Life and Living Systems (ExCELLS), National Institutes of Natural Sciences, Okazaki, Aichi, 444-8787, Japan
| | - Chihong Song
- National Institute for Physiological Sciences, National Institutes of Natural Sciences, Okazaki, Aichi, 444-8787, Japan
| | - Kazuyoshi Murata
- National Institute for Physiological Sciences, National Institutes of Natural Sciences, Okazaki, Aichi, 444-8787, Japan
| | - Ryota Iino
- Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, Aichi, 444-8787, Japan. .,Department of Functional Molecular Science, School of Physical Sciences, The Graduate University for Advanced Studies (SOKENDAI), Hayama, Kanagawa, 240-0193, Japan.
| | - Toshio Ando
- Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kanazawa, 920-1192, Japan.
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29
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Unzueta U, Cespedes MV, Sala R, Alamo P, Sánchez-Chardi A, Pesarrodona M, Sánchez-García L, Cano-Garrido O, Villaverde A, Vázquez E, Mangues R, Seras-Franzoso J. Release of targeted protein nanoparticles from functional bacterial amyloids: A death star-like approach. J Control Release 2018; 279:29-39. [PMID: 29641987 DOI: 10.1016/j.jconrel.2018.04.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 04/03/2018] [Accepted: 04/04/2018] [Indexed: 01/07/2023]
Abstract
Sustained release of drug delivery systems (DDS) has the capacity to increase cancer treatment efficiency in terms of drug dosage reduction and subsequent decrease of deleterious side effects. In this regard, many biomaterials are being investigated but none offers morphometric and functional plasticity and versatility comparable to protein-based nanoparticles (pNPs). Here we describe a new DDS by which pNPs are fabricated as bacterial inclusion bodies (IB), that can be easily isolated, subcutaneously injected and used as reservoirs for the sustained release of targeted pNPs. Our approach combines the high performance of pNP, regarding specific cell targeting and biodistribution with the IB supramolecular organization, stability and cost effectiveness. This renders a platform able to provide a sustained source of CXCR4-targeted pNPs that selectively accumulate in tumor cells in a CXCR4+ colorectal cancer xenograft model. In addition, the proposed system could be potentially adapted to any other protein construct offering a plethora of possible new therapeutic applications in nanomedicine.
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Affiliation(s)
- Ugutz Unzueta
- Institute of Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain
| | - María Virtudes Cespedes
- CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain; Biomedical Research Institute Sant Pau (IIB-SantPau), Josep Carreras Research Institute, Hospital de la Santa Creu i Sant Pau, 08025 Barcelona, Spain
| | - Rita Sala
- CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain; Biomedical Research Institute Sant Pau (IIB-SantPau), Josep Carreras Research Institute, Hospital de la Santa Creu i Sant Pau, 08025 Barcelona, Spain
| | - Patricia Alamo
- CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain; Biomedical Research Institute Sant Pau (IIB-SantPau), Josep Carreras Research Institute, Hospital de la Santa Creu i Sant Pau, 08025 Barcelona, Spain
| | | | - Mireia Pesarrodona
- Institute of Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain
| | - Laura Sánchez-García
- Institute of Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain
| | - Olivia Cano-Garrido
- Institute of Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain
| | - Antonio Villaverde
- Institute of Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain
| | - Esther Vázquez
- Institute of Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain.
| | - Ramón Mangues
- CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain; Biomedical Research Institute Sant Pau (IIB-SantPau), Josep Carreras Research Institute, Hospital de la Santa Creu i Sant Pau, 08025 Barcelona, Spain.
| | - Joaquin Seras-Franzoso
- Institute of Biotechnology and Biomedicine, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; Department of Genetics and Microbiology, Autonomous University of Barcelona, Bellaterra, 08193 Barcelona, Spain; CIBER Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain.
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30
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Wang Y, Feng K, Yang H, Zhang Z, Yuan Y, Yue T. Effect of Cinnamaldehyde and Citral Combination on Transcriptional Profile, Growth, Oxidative Damage and Patulin Biosynthesis of Penicillium expansum. Front Microbiol 2018; 9:597. [PMID: 29651282 PMCID: PMC5884930 DOI: 10.3389/fmicb.2018.00597] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2017] [Accepted: 03/15/2018] [Indexed: 11/25/2022] Open
Abstract
Penicillium expansum, as a main postharvest pathogen of fruits, can secrete patulin (PAT), causing fruit decay and health problems. In this study, the antifungal test, SEM (scanning electron microscope) observation, transcriptional profile, PAT biosynthesis, and physiological characters of P. expansum exposed to cinnamaldehyde and citral combination (Cin/Cit) were evaluated. Cin/Cit could inhibit the mycelial growth and spore germination of P. expansum in a dose-dependent manner. Besides, Cin/Cit caused spores and mycelia wrinkled and depressed by SEM observation. Gene expression profiles of P. expansum were conducted by RNA sequencing (RNA-seq) in the presence or absence of Cin/Cit treatment. A total of 1713 differentially expressed genes (DEGs) were obtained, including 793 down-regulated and 920 up-regulated genes. Most of the DEGs participated in the biosynthesis of secondary metabolites, amino acid metabolism, and oxidation-reduction process, etc. Cin/Cit induced the dysfunction of the mitochondrial membrane, causing the potential influence on energy metabolism and reactive oxidative species production. The changes of superoxide dismutase (SOD) and catalase (CAT) activities combing with the increase of hydrogen peroxide content indicated the oxidative stress on P. expansum induced by Cin/Cit, which corresponded well with the transcriptional results. Moreover, both the RNA-seq data and the qRT-PCR showed the remarkable down-regulation of genes included in the PAT biosynthetic pathway under the Cin/Cit treatment. These findings provided more useful information about the antifungal mechanism of Cin/Cit against P. expansum at molecular and gene levels and suggested that Cin/Cit is a potential candidate to control P. expansum.
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Affiliation(s)
- Yuan Wang
- College of Food Science and Engineering, Northwest University, Xi'an, China.,College of Food Science and Engineering, Northwest A&F University, Yangling, China.,Laboratory of Quality and Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Beijing, China.,National Engineering Research Center of Agriculture Integration Test (Yangling), Yangling, China
| | - Kewei Feng
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Agronomy, Northwest A&F University, Yangling, China
| | - Haihua Yang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China.,Laboratory of Quality and Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Beijing, China.,National Engineering Research Center of Agriculture Integration Test (Yangling), Yangling, China
| | - Zhiwei Zhang
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
| | - Yahong Yuan
- College of Food Science and Engineering, Northwest A&F University, Yangling, China.,Laboratory of Quality and Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Beijing, China.,National Engineering Research Center of Agriculture Integration Test (Yangling), Yangling, China
| | - Tianli Yue
- College of Food Science and Engineering, Northwest University, Xi'an, China.,College of Food Science and Engineering, Northwest A&F University, Yangling, China.,Laboratory of Quality and Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Beijing, China.,National Engineering Research Center of Agriculture Integration Test (Yangling), Yangling, China
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31
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Abstract
By assisting in the proteolysis, disaggregation and refolding of the aggregated proteins, Caseinolytic proteases (Clps) enhance the cellular survival under stress conditions. In the current study, comparative roles of two such Clps, ClpA (involved in proteolysis) and ClpB (involved in protein disaggregation and refolding) in the survival of Salmonella Typhimurium (S. Typhimurium) under different stresses and in virulence have been investigated. clpA and clpB gene deletion mutant strains (∆clpA and ∆clpB) of S. Typhimurium have been hypersensitive to 42 °C, HOCl and paraquat. However, the ∆clpB strain was comparatively much more susceptible (p < 0.001) to the above stresses than ∆clpA strain. ∆clpB strain also showed reduced survival (p < 0.001) in poultry macrophages. The hypersusceptibilities of ∆clpB strain to oxidants and macrophages were restored in plasmid based complemented (∆clpB + pclpB) strain. Further, the ∆clpB strain was defective for colonization in the poultry caecum and showed decreased dissemination to the spleen and liver. Our findings suggest that the role of ClpB is more important than the role of ClpA for the survival of S. Typhimurium under stress and colonization in chickens.
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32
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Fusion protein analysis reveals the precise regulation between Hsp70 and Hsp100 during protein disaggregation. Sci Rep 2017; 7:8648. [PMID: 28819163 PMCID: PMC5561102 DOI: 10.1038/s41598-017-08917-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 07/13/2017] [Indexed: 12/19/2022] Open
Abstract
ClpB, a bacterial Hsp100, is a ring-shaped AAA+ chaperone that can reactivate aggregated proteins in cooperation with DnaK, a bacterial Hsp70, and its co-factors. ClpB subunits comprise two AAA+ modules with an interstitial rod-shaped M-domain. The M-domain regulates ClpB ATPase activity and interacts directly with the DnaK nucleotide-binding domain (NBD). Here, to clarify how these functions contribute to the disaggregation process, we constructed ClpB, DnaK, and aggregated YFP fusion proteins in various combinations. Notably, i) DnaK activates ClpB only when the DnaK substrate-binding domain (SBD) is in the closed conformation, affording high DnaK-peptide affinity; ii) although NBD alone can activate ClpB, SBD is required for disaggregation; and iii) tethering aggregated proteins to the activated ClpB obviates SBD requirements. These results indicate that DnaK activates ClpB only when the SBD tightly holds aggregated proteins adjacent to ClpB for effective disaggregation.
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33
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Wang Y, Li Y, Ding T. Heat shock protein 90β in the Vero cell membrane binds Japanese encephalitis virus. Int J Mol Med 2017; 40:474-482. [PMID: 28656253 PMCID: PMC5505021 DOI: 10.3892/ijmm.2017.3041] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 06/14/2017] [Indexed: 12/20/2022] Open
Abstract
The pathogenesis of Japanese encephalitis virus (JEV) is complex and unclearly defined, and in particular, the effects of the JEV receptor (JEVR) on diverse susceptible cells are elusive. In contrast to previous studies investigating JEVR in rodent or mosquito cells, in this study, we used primate Vero cells instead. We noted that few novel proteins co‑immunoprecipitated with JEV, and discovered that one of these was heat shock protein 90β (HSP90β), which was probed by mass spectrometry with the highest score of 60.3 after questing the monkey and human protein databases. The specific HSP90β‑JEV binding was confirmed by western blot analysis under non‑reducing conditions, and this was significantly inhibited by an anti‑human HSP90β monoclonal antibody in a dose‑dependent manner, as shown by immunofluorescence assay and flow cytometry. In addition, the results of confocal laser scanning microscopic examination demonstrated that the HSP90β‑JEV binding occurred on the Vero cell surface. Finally, JEV progeny yields determined by plaque assay were also markedly decreased in siRNA‑treated Vero cells, particularly at 24 and 36 h post‑infection. Thus, our data indicate that HSP90β is a binding receptor for JEV in Vero cells.
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Affiliation(s)
- Yuan Wang
- Department of Microbiology, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Yan Li
- Department of Microbiology, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Tianbing Ding
- Department of Microbiology, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
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34
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Sharma SK, Priya S. Expanding role of molecular chaperones in regulating α-synuclein misfolding; implications in Parkinson's disease. Cell Mol Life Sci 2017; 74:617-629. [PMID: 27522545 PMCID: PMC11107554 DOI: 10.1007/s00018-016-2340-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 08/09/2016] [Accepted: 08/10/2016] [Indexed: 12/19/2022]
Abstract
Protein misfolding under stressful environmental conditions cause several cellular problems owing to the disturbed cellular protein homeostasis, which may further lead to neurological disorders like Parkinson's disease (PD), Alzheimer's disease (AD), Amyloid lateral sclerosis and Huntington disease (HD). The presence of cellular defense mechanisms like molecular chaperones and proteasomal degradation systems prevent protein misfolding and aggregation. Molecular chaperones plays primary role in preventing protein misfolding by mediating proper native folding, unfolding and refolding of the polypeptides along with vast number of cellular functions. In past few years, the understanding of molecular chaperone mechanisms has been expanded enormously although implementation to prevent protein aggregation diseases is still deficient. We in this review evaluated major classes of molecular chaperones and their mechanisms relevant for preventing protein aggregation, specific case of α-synuclein aggregation. We also evaluate the molecular chaperone function as a novel therapeutic approach and the chaperone inhibitors or activators as small molecular drug targets.
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Affiliation(s)
- Sandeep K Sharma
- Food, Drug and Chemical Toxicology Group, CSIR-Indian Institute of Toxicology Research, Lucknow, 226001, Uttar Pradesh, India
- Nanotherapeutics and Nanomaterial Toxicology Group, CSIR-Indian Institute of Toxicology Research, Lucknow, 226001, Uttar Pradesh, India
| | - Smriti Priya
- Systems Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research, Lucknow, 226001, Uttar Pradesh, India.
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35
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Unzueta U, Seras-Franzoso J, Céspedes MV, Saccardo P, Cortés F, Rueda F, Garcia-Fruitós E, Ferrer-Miralles N, Mangues R, Vázquez E, Villaverde A. Engineering tumor cell targeting in nanoscale amyloidal materials. NANOTECHNOLOGY 2017; 28:015102. [PMID: 27893441 DOI: 10.1088/0957-4484/28/1/015102] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Bacterial inclusion bodies are non-toxic, mechanically stable and functional protein amyloids within the nanoscale size range that are able to naturally penetrate into mammalian cells, where they deliver the embedded protein in a functional form. The potential use of inclusion bodies in protein delivery or protein replacement therapies is strongly impaired by the absence of specificity in cell binding and penetration, thus preventing targeting. To address this issue, we have here explored whether the genetic fusion of two tumor-homing peptides, the CXCR4 ligands R9 and T22, to an inclusion body-forming green fluorescent protein (GFP), would keep the interaction potential and the functionality of the fused peptides and then confer CXCR4 specificity in cell binding and further uptake of the materials. The fusion proteins have been well produced in Escherichia coli in their full-length form, keeping the potential for fluorescence emission of the partner GFP. By using specific inhibitors of CXCR4 binding, we have demonstrated that the engineered protein particles are able to penetrate CXCR4+ cells, in a receptor-mediated way, without toxicity or visible cytopathic effects, proving the availability of the peptide ligands on the surface of inclusion bodies. Since no further modification is required upon their purification, the biological production of genetically targeted inclusion bodies opens a plethora of cost-effective possibilities in the tissue-specific intracellular transfer of functional proteins through the use of structurally and functionally tailored soft materials.
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Affiliation(s)
- Ugutz Unzueta
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain. Department de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain. CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Bellaterra, 08193 Barcelona, Spain
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Li H, Gänzle M. Some Like It Hot: Heat Resistance of Escherichia coli in Food. Front Microbiol 2016; 7:1763. [PMID: 27857712 PMCID: PMC5093140 DOI: 10.3389/fmicb.2016.01763] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 10/20/2016] [Indexed: 11/13/2022] Open
Abstract
Heat treatment and cooking are common interventions for reducing the numbers of vegetative cells and eliminating pathogenic microorganisms in food. Current cooking method requires the internal temperature of beef patties to reach 71°C. However, some pathogenic Escherichia coli such as the beef isolate E. coli AW 1.7 are extremely heat resistant, questioning its inactivation by current heat interventions in beef processing. To optimize the conditions of heat treatment for effective decontaminations of pathogenic E. coli strains, sufficient estimations, and explanations are necessary on mechanisms of heat resistance of target strains. The heat resistance of E. coli depends on the variability of strains and properties of food formulations including salt and water activity. Heat induces alterations of E. coli cells including membrane, cytoplasm, ribosome and DNA, particularly on proteins including protein misfolding and aggregations. Resistant systems of E. coli act against these alterations, mainly through gene regulations of heat response including EvgA, heat shock proteins, σE and σS, to re-fold of misfolded proteins, and achieve antagonism to heat stress. Heat resistance can also be increased by expression of key proteins of membrane and stabilization of membrane fluidity. In addition to the contributions of the outer membrane porin NmpC and overcome of osmotic stress from compatible solutes, the new identified genomic island locus of heat resistant performs a critical role to these highly heat resistant strains. This review aims to provide an overview of current knowledge on heat resistance of E. coli, to better understand its related mechanisms and explore more effective applications of heat interventions in food industry.
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Affiliation(s)
- Hui Li
- Department of Agricultural, Food and Nutritional Science, University of Alberta, EdmontonAB, Canada
| | - Michael Gänzle
- Department of Agricultural, Food and Nutritional Science, University of Alberta, EdmontonAB, Canada
- College of Bioengineering and Food Science, Hubei University of TechnologyHubei, China
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Torrealba D, Seras-Franzoso J, Mamat U, Wilke K, Villaverde A, Roher N, Garcia-Fruitós E. Complex Particulate Biomaterials as Immunostimulant-Delivery Platforms. PLoS One 2016; 11:e0164073. [PMID: 27716780 PMCID: PMC5055299 DOI: 10.1371/journal.pone.0164073] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 09/19/2016] [Indexed: 11/18/2022] Open
Abstract
The control of infectious diseases is a major current challenge in intensive aquaculture. Most commercial vaccines are based on live attenuated or inactivated pathogens that are usually combined with adjuvants, oil emulsions being as the most widely used for vaccination in aquaculture. Although effective, the use of these oil emulsions is plagued with important side effects. Thus, the development of alternative safer and cost-effective immunostimulants and adjuvants is highly desirable. Here we have explored the capacity of inclusion bodies produced in bacteria to immunostimulate and protect fish against bacterial infections. Bacterial inclusion bodies are highly stable, non-toxic protein-based biomaterials produced through fully scalable and low-cost bio-production processes. The present study shows that the composition and structured organization of inclusion body components (protein, lipopolysaccharide, peptidoglycan, DNA and RNA) make these protein biomaterials excellent immunomodulators able to generically protect fish against otherwise lethal bacterial challenges. The results obtained in this work provide evidence that their inherent nature makes bacterial inclusion bodies exceptionally attractive as immunostimulants and this opens the door to the future exploration of this biomaterial as an alternative adjuvant for vaccination purposes in veterinary.
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Affiliation(s)
- Débora Torrealba
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- Departament de Biologia Cel·lular, Fisiologia Animal i Immunologia, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
| | - Joaquin Seras-Franzoso
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Cerdanyola del Vallès, Spain
| | - Uwe Mamat
- Division of Structural Biochemistry, Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), Member of the German Center for Lung Research (DZL), Borstel, Germany
| | - Kathleen Wilke
- Division of Structural Biochemistry, Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), Member of the German Center for Lung Research (DZL), Borstel, Germany
| | - Antonio Villaverde
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Cerdanyola del Vallès, Spain
| | - Nerea Roher
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- Departament de Biologia Cel·lular, Fisiologia Animal i Immunologia, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- * E-mail: (NR); (EGF)
| | - Elena Garcia-Fruitós
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Cerdanyola del Vallès, Spain
- * E-mail: (NR); (EGF)
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Cano-Garrido O, Sánchez-Chardi A, Parés S, Giró I, Tatkiewicz WI, Ferrer-Miralles N, Ratera I, Natalello A, Cubarsi R, Veciana J, Bach À, Villaverde A, Arís A, Garcia-Fruitós E. Functional protein-based nanomaterial produced in microorganisms recognized as safe: A new platform for biotechnology. Acta Biomater 2016; 43:230-239. [PMID: 27452157 DOI: 10.1016/j.actbio.2016.07.038] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 07/12/2016] [Accepted: 07/20/2016] [Indexed: 12/18/2022]
Abstract
UNLABELLED Inclusion bodies (IBs) are protein-based nanoparticles formed in Escherichia coli through stereospecific aggregation processes during the overexpression of recombinant proteins. In the last years, it has been shown that IBs can be used as nanostructured biomaterials to stimulate mammalian cell attachment, proliferation, and differentiation. In addition, these nanoparticles have also been explored as natural delivery systems for protein replacement therapies. Although the production of these protein-based nanomaterials in E. coli is economically viable, important safety concerns related to the presence of endotoxins in the products derived from this microorganism need to be addressed. Lactic acid bacteria (LAB) are a group of food-grade microorganisms that have been classified as safe by biologically regulatory agencies. In this context, we have demonstrated herein, for the first time, the production of fully functional, IB-like protein nanoparticles in LAB. These nanoparticles have been fully characterized using a wide range of techniques, including field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), Fourier transform infrared (FTIR) spectroscopy, zymography, cytometry, confocal microscopy, and wettability and cell coverage measurements. Our results allow us to conclude that these materials share the main physico-chemical characteristics with IBs from E. coli and moreover are devoid of any harmful endotoxin contaminant. These findings reveal a new platform for the production of protein-based safe products with high pharmaceutical interest. STATEMENT OF SIGNIFICANCE The development of both natural and synthetic biomaterials for biomedical applications is a field in constant development. In this context, E. coli is a bacteria that has been widely studied for its ability to naturally produce functional biomaterials with broad biomedical uses. Despite being effective, products derived from this species contain membrane residues able to trigger a non-desired immunogenic responses. Accordingly, exploring alternative bacteria able to synthesize such biomaterials in a safe molecular environment is becoming a challenge. Thus, the present study describes a new type of functional protein-based nanomaterial free of toxic contaminants with a wide range of applications in both human and veterinary medicine.
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Carroll LM, Bergholz TM, Hildebrandt IM, Marks BP. Application of a Nonlinear Model to Transcript Levels of Upregulated Stress Response Gene ibpA in Stationary-Phase Salmonella enterica Subjected to Sublethal Heat Stress. J Food Prot 2016; 79:1089-96. [PMID: 27357027 DOI: 10.4315/0362-028x.jfp-15-377] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Sublethal heating, which can occur during slow cooking of meat products, is known to induce increased thermal resistance in Salmonella. However, very few studies have addressed the kinetics of this response. Although several recent studies have reported improved thermal inactivation models that include the effect of prior sublethal history on subsequent thermal resistance, none of these models were based on cellular-level responses to sublethal thermal stress. The goal of this study was to determine whether a nonlinear model could accurately portray the response of Salmonella to heat stress induced by prolonged exposure to sublethal temperatures. To accomplish this, stationary-phase Salmonella Montevideo cultures were subjected to various heating profiles (held at either 40 or 45°C for 0, 5, 10, 15, 30, 60, 90, 180, or 240 min) using a PCR thermal cycler. Differential plating on selective and nonselective media was used to confirm the presence of cellular injury. Reverse transcription quantitative PCR was used to screen the transcript levels of six heat stress-related genes to find candidate genes for nonlinear modeling. Injury was detected in populations of Salmonella held at 45°C for 30, 60, and 90 min and at 40°C for 0, 5, and 90 min (P < 0.05), whereas no significant injury was found at 180 and 240 min (P > 0.05). The transcript levels of ibpA, which codes for a small heat shock protein associated with the ClpB and DnaK-DnaJ-GrpE chaperone systems, showed the greatest increase relative to the transcript levels at 0 min, which was significant at 5, 10, 15, 30, 60, 90, and 180 min at 45°C and at 5, 10, 15, 30, 60, and 90 min at 40°C (P < 0.05). Using ibpA transcript levels as an indicator of adaptation to thermal stress, a nonlinear model for sublethal injury is proposed. The use of variables indicating the physiological state of the pathogen during stress has the potential to increase the accuracy of thermal inactivation models that must account for prolonged exposure to sublethal temperatures.
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Affiliation(s)
- Laura M Carroll
- Department of Food Science, Cornell University, Ithaca, New York 14853, USA.
| | - Teresa M Bergholz
- Department of Veterinary and Microbiological Sciences, North Dakota State University, Fargo, North Dakota 58102, USA
| | - Ian M Hildebrandt
- Department of Biosystems and Agricultural Engineering, Michigan State University, East Lansing, Michigan 48824, USA
| | - Bradley P Marks
- Department of Biosystems and Agricultural Engineering, Department of Food Science and Human Nutrition, Michigan State University, East Lansing, Michigan 48824, USA
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Influence of Low-Shear Modeled Microgravity on Heat Resistance, Membrane Fatty Acid Composition, and Heat Stress-Related Gene Expression in Escherichia coli O157:H7 ATCC 35150, ATCC 43889, ATCC 43890, and ATCC 43895. Appl Environ Microbiol 2016; 82:2893-2901. [PMID: 26944847 DOI: 10.1128/aem.00050-16] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 03/01/2016] [Indexed: 12/27/2022] Open
Abstract
UNLABELLED We previously showed that modeled microgravity conditions alter the physiological characteristics of Escherichia coli O157:H7. To examine how microgravity conditions affect bacterial heat stress responses, D values, membrane fatty acid composition, and heat stress-related gene expression (clpB, dnaK, grpE, groES, htpG, htpX, ibpB, and rpoH), E. coli O157:H7 ATCC 35150, ATCC 43889, ATCC 43890, and ATCC 43895 were cultured under two different conditions: low-shear modeled microgravity (LSMMG, an analog of spaceflight conditions) and normal gravity (NG, Earth-like conditions). When 24-h cultures were heated to 55°C, cells cultured under LSMMG conditions showed reduced survival compared with cells cultured under NG conditions at all time points (P < 0.05). D values of all tested strains were lower after LSMMG culture than after NG culture. Fourteen of 37 fatty acids examined were present in the bacterial membrane: nine saturated fatty acids (SFA) and five unsaturated fatty acids (USFA). The USFA/SFA ratio, a measure of membrane fluidity, was higher under LSMMG conditions than under NG conditions. Compared with control cells grown under NG conditions, cells cultured under LSMMG conditions showed downregulation of eight heat stress-related genes (average, -1.9- to -3.7-fold). The results of this study indicate that in a simulated space environment, heat resistance of E. coli O157:H7 decreased, and this might be due to the synergistic effects of the increases in membrane fluidity and downregulated relevant heat stress genes. IMPORTANCE Microgravity is a major factor that represents the environmental conditions in space. Since infectious diseases are difficult to deal with in a space environment, comprehensive studies on the behavior of pathogenic bacteria under microgravity conditions are warranted. This study reports the changes in heat stress resistance of E. coli O157:H7, the severe foodborne pathogen, under conditions that mimic microgravity. The results provide scientific clues for further understanding of the bacterial response under the simulated microgravity conditions. It will contribute not only to the improvement of scientific knowledge in the academic fields but also ultimately to the development of a prevention strategy for bacterial disease in the space environment.
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Seras-Franzoso J, Sánchez-Chardi A, Garcia-Fruitós E, Vázquez E, Villaverde A. Cellular uptake and intracellular fate of protein releasing bacterial amyloids in mammalian cells. SOFT MATTER 2016; 12:3451-3460. [PMID: 26956912 DOI: 10.1039/c5sm02930a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Bacterial Inclusion Bodies (IBs) are amyloidal protein deposits that functionally mimic secretory granules from the endocrine system. When formed by therapeutically relevant proteins, they complement missing intracellular activities in jeopardized cell cultures, offering an intriguing platform for protein drug delivery in substitutive therapies. Despite the therapeutic potential of IBs, their capability to interact with eukaryotic cells, cross the cell membrane and release their functional building blocks into the cytosolic space remains essentially unexplored. We have systematically dissected the process by which bacterial amyloids interact with mammalian cells. An early and tight cell membrane anchorage of IBs is followed by cellular uptake of single or grouped IBs of variable sizes by macropinocytosis. Although an important fraction of the penetrating particles is led to lysosomal degradation, biologically significant amounts of protein are released into the cytosol. In addition, our data suggest the involvement of the bacterial cell folding modulator DnaK in the release of functional proteins from these amyloidal reservoirs. The mechanisms supporting the internalization of disintegrable protein nanoparticles revealed here offer clues to implement novel approaches for protein drug delivery based on controlled protein packaging as bacterial IBs.
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Affiliation(s)
- Joaquin Seras-Franzoso
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain.
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Martínez-Bussenius C, Navarro CA, Orellana L, Paradela A, Jerez CA. Global response of Acidithiobacillus ferrooxidans ATCC 53993 to high concentrations of copper: A quantitative proteomics approach. J Proteomics 2016; 145:37-45. [PMID: 27079981 DOI: 10.1016/j.jprot.2016.03.039] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Revised: 03/16/2016] [Accepted: 03/29/2016] [Indexed: 11/26/2022]
Abstract
UNLABELLED Acidithiobacillus ferrooxidans is used in industrial bioleaching of minerals to extract valuable metals. A. ferrooxidans strain ATCC 53993 is much more resistant to copper than other strains of this microorganism and it has been proposed that genes present in an exclusive genomic island (GI) of this strain would contribute to its extreme copper tolerance. ICPL (isotope-coded protein labeling) quantitative proteomics was used to study in detail the response of this bacterium to copper. A high overexpression of RND efflux systems and CusF copper chaperones, both present in the genome and the GI of strain ATCC 53993 was found. Also, changes in the levels of the respiratory system proteins such as AcoP and Rus copper binding proteins and several proteins with other predicted functions suggest that numerous metabolic changes are apparently involved in controlling the effects of the toxic metal on this acidophile. SIGNIFICANCE Using quantitative proteomics we overview the adaptation mechanisms that biomining acidophiles use to stand their harsh environment. The overexpression of several genes present in an exclusive genomic island strongly suggests the importance of the proteins coded in this DNA region in the high tolerance of A. ferrooxidans ATCC 53993 to metals.
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Affiliation(s)
- Cristóbal Martínez-Bussenius
- Laboratory of Molecular Microbiology and Biotechnology, Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Claudio A Navarro
- Laboratory of Molecular Microbiology and Biotechnology, Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Luis Orellana
- Laboratory of Molecular Microbiology and Biotechnology, Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Alberto Paradela
- Proteomics Laboratory, National Biotechnology Center, CSIC, Madrid, Spain
| | - Carlos A Jerez
- Laboratory of Molecular Microbiology and Biotechnology, Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
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Araújo FS, Coelho LM, Silva LDC, da Silva Neto BR, Parente-Rocha JA, Bailão AM, de Oliveira CMA, Fernandes GDR, Hernández O, Ochoa JGM, Soares CMDA, Pereira M. Effects of Argentilactone on the Transcriptional Profile, Cell Wall and Oxidative Stress of Paracoccidioides spp. PLoS Negl Trop Dis 2016; 10:e0004309. [PMID: 26734764 PMCID: PMC4703379 DOI: 10.1371/journal.pntd.0004309] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 11/26/2015] [Indexed: 02/06/2023] Open
Abstract
Paracoccidioides spp., a dimorphic pathogenic fungus, is the etiologic agent of paracoccidioidomycosis (PCM). PCM is an endemic disease that affects at least 10 million people in Latin America, causing severe public health problems. The drugs used against pathogenic fungi have various side effects and limited efficacy; therefore, there is an inevitable and urgent medical need for the development of new antifungal drugs. In the present study, we evaluated the transcriptional profile of Paracoccidioides lutzii exposed to argentilactone, a constituent of the essential oil of Hyptis ovalifolia. A total of 1,058 genes were identified, of which 208 were up-regulated and 850 were down-regulated. Cell rescue, defense and virulence, with a total of 26 genes, was a functional category with a large number of genes induced, including heat shock protein 90 (hsp90), cytochrome c peroxidase (ccp), the hemoglobin ligand RBT5 (rbt5) and superoxide dismutase (sod). Quantitative real-time PCR revealed an increase in the expression level of all of those genes. An enzymatic assay showed a significant increase in SOD activity. The reduced growth of Pbhsp90-aRNA, Pbccp-aRNA, Pbsod-aRNA and Pbrbt5-aRNA isolates in the presence of argentilactone indicates the importance of these genes in the response of Paracoccidioides spp. to argentilactone. The response of the P. lutzii cell wall to argentilactone treatment was also evaluated. The results showed that argentilactone caused a decrease in the levels of polymers in the cell wall. These results suggest that argentilactone is a potential candidate for antifungal therapy. Paracoccidioidomycosis (PCM) is a neglected human systemic mycosis caused by Paracoccidioides spp. fungus that invades the host’s lungs and can disseminate to many other organs. Treatment usually involves amphotericin B, sulfadiazine, trimethoprim-sulfamethoxazole, itraconazole, ketoconazole or fluconazole for six months to two years. In this way, many adverse effects are associated with treatment, and patients can have many co-morbidities and difficulties in complying with treatment. For those reasons, more effective and less toxic drugs are needed. The discovery of a potentially bioactive molecule and its correlation with a biological target is an important step in the research and development of drugs. One of the ways in which cells adjust to environmental change is by changing the pattern of gene expression. Thus, the transcriptome is potential experimental strategy to elucidate the mode of action of bioactive molecules. Here, Paracoccidoides spp. altered the expression of genes, leading to a further understanding of the action of the compound argentilactone in the fungal cells. Argentilactone seems to be able to modulate cellular targets, to induce oxidative stress and to interfere with the biosynthesis of the P. lutzii cell wall.
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Affiliation(s)
- Felipe Souto Araújo
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Luciene Melo Coelho
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Lívia do Carmo Silva
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | | | - Juliana Alves Parente-Rocha
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Alexandre Melo Bailão
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | | | - Gabriel da Rocha Fernandes
- Laboratório de Biodados, Biologia Celular e Desenvolvimento, Universidade Católica de Brasília, Brasília, Distrito Federal, Brazil
| | - Orville Hernández
- Unidad de Biología Celular y Molecular, Corporación para Investigaciones Biológicas (CIB) and Escuela de Microbiología Universidad de Antioquia, Medellín, Colombia
| | - Juan Guillermo McEwen Ochoa
- Unidad de Biología Celular y Molecular, Corporación para Investigaciones Biológicas (CIB) and Facultad de Medicina Universidad de Antioquia, Medellín, Colombia
| | - Célia Maria de Almeida Soares
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Maristela Pereira
- Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
- * E-mail:
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Lee C, Wigren E, Trček J, Peters V, Kim J, Hasni MS, Nimtz M, Lindqvist Y, Park C, Curth U, Lünsdorf H, Römling U. A novel protein quality control mechanism contributes to heat shock resistance of worldwide-distributed Pseudomonas aeruginosa clone C strains. Environ Microbiol 2015; 17:4511-26. [PMID: 26014207 DOI: 10.1111/1462-2920.12915] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Accepted: 05/19/2015] [Indexed: 11/30/2022]
Abstract
Pseudomonas aeruginosa is a highly successful nosocomial pathogen capable of causing a wide variety of infections with clone C strains most prevalent worldwide. In this study, we initially characterize a molecular mechanism of survival unique to clone C strains. We identified a P. aeruginosa clone C-specific genomic island (PACGI-1) that contains the highly expressed small heat shock protein sHsp20c, the founding member of a novel subclass of class B bacterial small heat shock proteins. sHsp20c and adjacent gene products are involved in resistance against heat shock. Heat stable sHsp20c is unconventionally expressed in stationary phase in a wide temperature range from 20 to 42°C. Purified sHsp20c has characteristic features of small heat shock protein class B as it is monodisperse, forms sphere-like 24-meric oligomers and exhibits significant chaperone activity. As the P. aeruginosa clone C population is significantly more heat shock resistant than genetically unrelated P. aeruginosa strains without sHsp20c, the horizontally acquired shsp20c operon might contribute to the survival of worldwide-distributed clone C strains.
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Affiliation(s)
- Changhan Lee
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, 171 77, Sweden
| | - Edvard Wigren
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, 171 77, Sweden
| | - Janja Trček
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, 171 77, Sweden
| | - Verena Peters
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, 171 77, Sweden
| | - Jihong Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea
| | - Muhammad Sharif Hasni
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, 171 77, Sweden
| | - Manfred Nimtz
- The Helmholtz Center for Infection Research, Braunschweig, 38124, Germany
| | - Ylva Lindqvist
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, 171 77, Sweden
| | - Chankyu Park
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea
| | - Ute Curth
- Institute for Biophysical Chemistry, Hannover Medical School, Hannover, 30625, Germany
| | - Heinrich Lünsdorf
- The Helmholtz Center for Infection Research, Braunschweig, 38124, Germany
| | - Ute Römling
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, 171 77, Sweden
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Individual and collective contributions of chaperoning and degradation to protein homeostasis in E. coli. Cell Rep 2015; 11:321-33. [PMID: 25843722 DOI: 10.1016/j.celrep.2015.03.018] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 01/29/2015] [Accepted: 03/07/2015] [Indexed: 11/24/2022] Open
Abstract
The folding fate of a protein in vivo is determined by the interplay between a protein's folding energy landscape and the actions of the proteostasis network, including molecular chaperones and degradation enzymes. The mechanisms of individual components of the E. coli proteostasis network have been studied extensively, but much less is known about how they function as a system. We used an integrated experimental and computational approach to quantitatively analyze the folding outcomes (native folding versus aggregation versus degradation) of three test proteins biosynthesized in E. coli under a variety of conditions. Overexpression of the entire proteostasis network benefited all three test proteins, but the effect of upregulating individual chaperones or the major degradation enzyme, Lon, varied for proteins with different biophysical properties. In sum, the impact of the E. coli proteostasis network is a consequence of concerted action by the Hsp70 system (DnaK/DnaJ/GrpE), the Hsp60 system (GroEL/GroES), and Lon.
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Zhou W, Zhang Y, Wen Y, Ji W, Zhou Y, Ji Y, Liu X, Wang W, Asim M, Liang X, Ai T, Lin L. Analysis of the transcriptomic profilings of Mandarin fish (Siniperca chuatsi) infected with Flavobacterium columnare with an emphasis on immune responses. FISH & SHELLFISH IMMUNOLOGY 2015; 43:111-119. [PMID: 25533996 DOI: 10.1016/j.fsi.2014.12.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Revised: 11/20/2014] [Accepted: 12/11/2014] [Indexed: 06/04/2023]
Abstract
Flavobacterium columnare (FC) is the causative pathogen of columnaris which has caused great economic loss in fish culture worldwide, including in Mandarin fish (Siniperca chuatsi) culture. In the present study, the transcriptomic profiles of the head kidneys from FC-infected and non-infected Mandarin fish were obtained using HiSeq™ 2000 (Illumina). Totally 31,168 unigenes with high quality were obtained. Genes involved in protein folding, metabolism and energy, immune responses, oxidoreductase activity, cell growth and death were identified as enriched classes. 1019 differently expressed genes between the two groups were identified, including 603 up-regulated and 416 down-regulated genes. 27 differently expressed immune related genes were scrutinized, including 17 up-regulated and 10 down-regulated genes. Six of the differently expressed genes were further validated by qRT-PCR. The roles of the immune related genes were discussed. Identification of the host genes in response to FC infection will shed a new light on the prevention of columnaris.
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Affiliation(s)
- Weidong Zhou
- Wuhan Fishery Research Institute, 430207 Wuhan, Hubei, China
| | - Yulei Zhang
- Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, 430070 Wuhan, Hubei, China; Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, 430070 Wuhan, Hubei, China
| | - Yi Wen
- Division of Science and Technology, Beijing Normal University - Hong Kong Baptist University United International College, 519085 Zhuhai, Guangdong, China
| | - Wei Ji
- Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, 430070 Wuhan, Hubei, China; Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, 430070 Wuhan, Hubei, China
| | - Yang Zhou
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, 430070 Wuhan, Hubei, China
| | - Yachan Ji
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, 430070 Wuhan, Hubei, China
| | - Xiaoling Liu
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, 430070 Wuhan, Hubei, China
| | - Weimin Wang
- China Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, 430070 Wuhan, Hubei, China
| | - Muhammad Asim
- Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, 430070 Wuhan, Hubei, China; Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, 430070 Wuhan, Hubei, China
| | - Xufang Liang
- Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, 430070 Wuhan, Hubei, China; China Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, 430070 Wuhan, Hubei, China.
| | - Taoshan Ai
- Wuhan Fishery Research Institute, 430207 Wuhan, Hubei, China
| | - Li Lin
- Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, 430070 Wuhan, Hubei, China; Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, 430070 Wuhan, Hubei, China; China Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, 430070 Wuhan, Hubei, China.
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Yamasaki T, Oohata Y, Nakamura T, Watanabe YH. Analysis of the cooperative ATPase cycle of the AAA+ chaperone ClpB from Thermus thermophilus by using ordered heterohexamers with an alternating subunit arrangement. J Biol Chem 2015; 290:9789-800. [PMID: 25713084 DOI: 10.1074/jbc.m114.617696] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Indexed: 01/17/2023] Open
Abstract
The ClpB/Hsp104 chaperone solubilizes and reactivates protein aggregates in cooperation with DnaK/Hsp70 and its cofactors. The ClpB/Hsp104 protomer has two AAA+ modules, AAA-1 and AAA-2, and forms a homohexamer. In the hexamer, these modules form a two-tiered ring in which each tier consists of homotypic AAA+ modules. By ATP binding and its hydrolysis at these AAA+ modules, ClpB/Hsp104 exerts the mechanical power required for protein disaggregation. Although ATPase cycle of this chaperone has been studied by several groups, an integrated understanding of this cycle has not been obtained because of the complexity of the mechanism and differences between species. To improve our understanding of the ATPase cycle, we prepared many ordered heterohexamers of ClpB from Thermus thermophilus, in which two subunits having different mutations were cross-linked to each other and arranged alternately and measured their nucleotide binding, ATP hydrolysis, and disaggregation abilities. The results indicated that the ATPase cycle of ClpB proceeded as follows: (i) the 12 AAA+ modules randomly bound ATP, (ii) the binding of four or more ATP to one AAA+ ring was sensed by a conserved Arg residue and converted another AAA+ ring into the ATPase-active form, and (iii) ATP hydrolysis occurred cooperatively in each ring. We also found that cooperative ATP hydrolysis in at least one ring was needed for the disaggregation activity of ClpB.
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Affiliation(s)
- Takashi Yamasaki
- From the Department of Biology, Faculty of Science and Engineering and the Institute for Integrative Neurobiology, Konan University, Okamoto 8-9-1, Kobe 658-8501, Japan
| | - Yukiko Oohata
- From the Department of Biology, Faculty of Science and Engineering and
| | - Toshiki Nakamura
- From the Department of Biology, Faculty of Science and Engineering and
| | - Yo-hei Watanabe
- From the Department of Biology, Faculty of Science and Engineering and the Institute for Integrative Neurobiology, Konan University, Okamoto 8-9-1, Kobe 658-8501, Japan
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Sekhon SS, Ahn JY, Ahn JM, Park JM, Min J, Kim YH. Stress specific Escherichia coli biosensors based on gene promoters for toxicity monitoring. Mol Cell Toxicol 2015. [DOI: 10.1007/s13273-014-0041-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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49
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Chang Z. Understanding What Small Heat Shock Proteins Do for Bacterial Cells. HEAT SHOCK PROTEINS 2015. [DOI: 10.1007/978-3-319-16077-1_22] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Mezzina MP, Wetzler DE, de Almeida A, Dinjaski N, Prieto MA, Pettinari MJ. A phasin with extra talents: a polyhydroxyalkanoate granule-associated protein has chaperone activity. Environ Microbiol 2014; 17:1765-76. [PMID: 25297625 DOI: 10.1111/1462-2920.12636] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 09/15/2014] [Accepted: 09/18/2014] [Indexed: 11/30/2022]
Abstract
Phasins are proteins associated to intracellular polyhydroxyalkanoate granules that affect polymer accumulation and the number and size of the granules. Previous work demonstrated that a phasin from Azotobacter sp FA-8 (PhaPAz ) had an unexpected growth-promoting and stress-protecting effect in Escherichia coli, suggesting it could have chaperone-like activities. In this work, in vitro and in vivo experiments were performed in order to investigate this possibility. PhaPAz was shown to prevent in vitro thermal aggregation of the model protein citrate synthase and to facilitate the refolding process of this enzyme after chemical denaturation. Microscopy techniques were used to analyse the subcellular localization of PhaPAz in E. coli strains and to study the role of PhaPAz in in vivo protein folding and aggregation. PhaPAz was shown to colocalize with inclusion bodies of PD, a protein that aggregates when overexpressed. A reduction in the number of inclusion bodies of PD was observed when it was coexpressed with PhaPAz or with the known chaperone GroELS. These results demonstrate that PhaPAz has chaperone-like functions both in vitro and in vivo in E. coli recombinants, and suggests that phasins could have a general protective role in natural polyhydroxyalkanoate producers.
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Affiliation(s)
- Mariela P Mezzina
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, IQUIBICEN-CONICET, Buenos Aires, Argentina
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