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Hasegawa H, Kobayashi I, Bairagi N, Watanabe S, Tanaka K. DnaK2 Mediates a Negative Feedback Regulation of the Heat Shock Responsive Hik2-Rre1 Two-Component System in the Cyanobacterium Synechococcus Elongatus PCC 7942. PLANT & CELL PHYSIOLOGY 2024; 65:120-127. [PMID: 37856257 DOI: 10.1093/pcp/pcad129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 09/26/2023] [Accepted: 10/16/2023] [Indexed: 10/21/2023]
Abstract
The two-component system (TCS) is a conserved signal transduction module in bacteria. The Hik2-Rre1 system is responsible for transcriptional activation upon high-temperature shift as well as plastoquinone-related redox stress in the cyanobacterium Synechococcus elongatus PCC 7942. As heat-induced de novo protein synthesis was previously shown to be required to quench the heat-activated response, we investigated the underlying mechanism in this study. We found that the heat-inducible transcription activation was alleviated by the overexpression of dnaK2, which is an essential homolog of the highly conserved HSP70 chaperone and whose expression is induced under the control of the Hik2-Rre1 TCS. Phosphorylation of Rre1 correlated with transcription of the regulatory target hspA. The redox stress response was found to be similarly repressed by dnaK2 overexpression. Considered together with the previous information, we propose a negative feedback mechanism of the Hik2-Rre1-dependent stress response that maintains the cellular homeostasis mediated by DnaK2.
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Affiliation(s)
- Hazuki Hasegawa
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, 226-8501 Japan
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, 226-8501 Japan
| | - Ikki Kobayashi
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, 226-8501 Japan
| | - Nachiketa Bairagi
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, 226-8501 Japan
| | - Satoru Watanabe
- Department of Bioscience, Tokyo University of Agriculture, Sakuragaoka, Setagaya-ku, Tokyo, 156-8502 Japan
| | - Kan Tanaka
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, 226-8501 Japan
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2
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Mangla N, Singh R, Agarwal N. HtpG Is a Metal-Dependent Chaperone Which Assists the DnaK/DnaJ/GrpE Chaperone System of Mycobacterium tuberculosis via Direct Association with DnaJ2. Microbiol Spectr 2023; 11:e0031223. [PMID: 37022172 PMCID: PMC10269695 DOI: 10.1128/spectrum.00312-23] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 03/06/2023] [Indexed: 04/07/2023] Open
Abstract
Protein folding is a crucial process in maintaining protein homeostasis, also known as proteostasis, in the cell. The requirement for the assistance of molecular chaperones in the appropriate folding of several proteins has already called into question the previously held view of spontaneous protein folding. These chaperones are highly ubiquitous cellular proteins, which not only help in mediating the proper folding of other nascent polypeptides but are also involved in refolding of the misfolded or the aggregated proteins. Hsp90 family proteins such as high-temperature protein G (HtpG) are abundant and ubiquitously expressed in both eukaryotic and prokaryotic cells. Although HtpG is known as an ATP-dependent chaperone protein in most organisms, function of this protein remains obscured in mycobacterial pathogens. Here, we aim to investigate significance of HtpG as a chaperone in the physiology of Mycobacterium tuberculosis. We report that M. tuberculosis HtpG (mHtpG) is a metal-dependent ATPase which exhibits chaperonin activity towards denatured proteins in coordination with the DnaK/DnaJ/GrpE chaperone system via direct association with DnaJ2. Increased expression of DnaJ1, DnaJ2, ClpX, and ClpC1 in a ΔhtpG mutant strain further suggests cooperativity of mHtpG with various chaperones and proteostasis machinery in M. tuberculosis. IMPORTANCE M. tuberculosis is exposed to variety of extracellular stressful conditions and has evolved mechanisms to endure and adapt to the adverse conditions for survival. mHtpG, despite being dispensable for M. tuberculosis growth under in vitro conditions, exhibits a strong and direct association with DnaJ2 cochaperone and assists the mycobacterial DnaK/DnaJ/GrpE (KJE) chaperone system. These findings suggest the potential role of mHtpG in stress management of the pathogen. Mycobacterial chaperones are responsible for folding of nascent protein as well as reactivation of protein aggregates. M. tuberculosis shows differential adaptive response subject to the availability of mHtpG. While its presence facilitates improved protein refolding via stimulation of the KJE chaperone activity, in the absence of mHtpG, M. tuberculosis enhances expression of DnaJ1/J2 cochaperones as well as Clp protease machinery for maintenance of proteostasis. Overall, this study provides a framework for future investigation to better decipher the mycobacterial proteostasis network in the light of stress adaptability and/or survival.
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Affiliation(s)
- Nikita Mangla
- Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana, India
- Jawaharlal Nehru University, New Delhi, Delhi, India
| | - Ramandeep Singh
- Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana, India
| | - Nisheeth Agarwal
- Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana, India
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Ibrahim IM, Rowden SJL, Cramer WA, Howe CJ, Puthiyaveetil S. Thiol redox switches regulate the oligomeric state of cyanobacterial Rre1, RpaA, and RpaB response regulators. FEBS Lett 2022; 596:1533-1543. [PMID: 35353903 PMCID: PMC9321951 DOI: 10.1002/1873-3468.14340] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 03/11/2022] [Accepted: 03/16/2022] [Indexed: 11/18/2022]
Abstract
Cyanobacteria employ two‐component sensor‐response regulator systems to monitor and respond to environmental challenges. The response regulators RpaA, RpaB, Rre1 and RppA are integral to circadian clock function and abiotic stress acclimation in cyanobacteria. RpaA, RpaB and Rre1 are known to interact with ferredoxin or thioredoxin, raising the possibility of their thiol regulation. Here, we report that Synechocystis sp. PCC 6803 Rre1, RpaA and RpaB exist as higher‐order oligomers under oxidising conditions and that reduced thioredoxin A converts them to monomers. We further show that these response regulators contain redox‐responsive cysteine residues with an Em7 around −300 mV. These findings suggest a direct thiol modulation of the activity of these response regulators, independent of their cognate sensor kinases.
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Affiliation(s)
- Iskander M Ibrahim
- Department of Biochemistry and Center for Plant Biology, Purdue University, West Lafayette, IN, 47907, USA
| | - Stephen J L Rowden
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW, UK
| | - William A Cramer
- Department of Biological Sciences, Purdue University, West Lafayette, IN, 47907, USA
| | - Christopher J Howe
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW, UK
| | - Sujith Puthiyaveetil
- Department of Biochemistry and Center for Plant Biology, Purdue University, West Lafayette, IN, 47907, USA
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Bairagi N, Watanabe S, Nimura-Matsune K, Tanaka K, Tsurumaki T, Nakanishi S, Tanaka K. Conserved Two-component Hik2-Rre1 Signaling Is Activated Under Temperature Upshift and Plastoquinone-reducing Conditions in the Cyanobacterium Synechococcus elongatus PCC 7942. PLANT & CELL PHYSIOLOGY 2022; 63:176-188. [PMID: 34750635 DOI: 10.1093/pcp/pcab158] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/25/2021] [Accepted: 11/08/2021] [Indexed: 06/13/2023]
Abstract
The highly conserved Hik2-Rre1 two-component system is a multi-stress responsive signal-transducing module that controls the expression of hsp and other genes in cyanobacteria. Previously, we found in Synechococcus elongatus PCC 7942 that the heat-inducible phosphorylation of Rre1 was alleviated in a hik34 mutant, suggesting that Hik34 positively regulates signaling. In this study, we examined the growth of the hik34 deletion mutant in detail, and newly identified suppressor mutations located in rre1 or sasA gene negating the phenotype. Subsequent analyses indicated that heat-inducible Rre1 phosphorylation is dependent on Hik2 and that Hik34 modulates this Hik2-dependent response. In the following part of this study, we focused on the mechanism to control the Hik2 activity. Other recent studies reported that Hik2 activity is regulated by the redox status of plastoquinone (PQ) through the 3Fe-4S cluster attached to the cyclic GMP, adenylyl cyclase, FhlA (GAF) domain. Consistent with this, Rre1 phosphorylation occurred after the addition of 2,5-dibromo-6-isopropyl-3-methyl-1,4-benzoquinone but not after the addition of 3-(3,4-dichlorophenyl)-1,1-dimethylurea to the culture medium, which corresponded to PQ-reducing or -oxidizing conditions, respectively, suggesting that the Hik2-to-Rre1 phosphotransfer was activated under PQ-reducing conditions. However, there was no correlation between the measured PQ redox status and Rre1 phosphorylation during the temperature upshift. Therefore, changes in the PQ redox status are not the direct reason for the heat-inducible Rre1 phosphorylation, while some redox regulation is likely involved as oxidation events dependent on 2,6-dichloro-1,4-benzoquinone prevented heat-inducible Rre1 phosphorylation. On the basis of these results, we propose a model for the control of Hik2-dependent Rre1 phosphorylation.
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Affiliation(s)
- Nachiketa Bairagi
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503 Japan
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503 Japan
| | - Satoru Watanabe
- Department of Bioscience, Tokyo University of Agriculture, Sakuragaoka, Setagaya-ku, Tokyo, 156-8502 Japan
| | - Kaori Nimura-Matsune
- Department of Bioscience, Tokyo University of Agriculture, Sakuragaoka, Setagaya-ku, Tokyo, 156-8502 Japan
| | - Kenya Tanaka
- Research Center for Solar Energy Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531 Japan
- Engineering Biology Research Center, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501 Japan
| | - Tatsuhiro Tsurumaki
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503 Japan
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503 Japan
| | - Shuji Nakanishi
- Research Center for Solar Energy Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531 Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Kan Tanaka
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503 Japan
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Zhou Z, Tang H, Wang W, Zhang L, Su F, Wu Y, Bai L, Li S, Sun Y, Tao F, Xu P. A cold shock protein promotes high-temperature microbial growth through binding to diverse RNA species. Cell Discov 2021; 7:15. [PMID: 33727528 PMCID: PMC7966797 DOI: 10.1038/s41421-021-00246-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Accepted: 01/27/2021] [Indexed: 01/18/2023] Open
Abstract
Endowing mesophilic microorganisms with high-temperature resistance is highly desirable for industrial microbial fermentation. Here, we report a cold-shock protein (CspL) that is an RNA chaperone protein from a lactate producing thermophile strain (Bacillus coagulans 2–6), which is able to recombinantly confer strong high-temperature resistance to other microorganisms. Transgenic cspL expression massively enhanced high-temperature growth of Escherichia coli (a 2.4-fold biomass increase at 45 °C) and eukaryote Saccharomyces cerevisiae (a 2.6-fold biomass increase at 36 °C). Importantly, we also found that CspL promotes growth rates at normal temperatures. Mechanistically, bio-layer interferometry characterized CspL’s nucleotide-binding functions in vitro, while in vivo we used RNA-Seq and RIP-Seq to reveal CspL’s global effects on mRNA accumulation and CspL’s direct RNA binding targets, respectively. Thus, beyond establishing how a cold-shock protein chaperone provides high-temperature resistance, our study introduces a strategy that may facilitate industrial thermal fermentation.
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Affiliation(s)
- Zikang Zhou
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Hongzhi Tang
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.
| | - Weiwei Wang
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Lige Zhang
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Fei Su
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Yuanting Wu
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Linquan Bai
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Sicong Li
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, and Wuhan University School of Pharmaceutical Sciences, Wuhan, Hubei, 430071, People's Republic of China
| | - Yuhui Sun
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, and Wuhan University School of Pharmaceutical Sciences, Wuhan, Hubei, 430071, People's Republic of China
| | - Fei Tao
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Ping Xu
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.
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Saito M, Watanabe S, Nimura-Matsune K, Yoshikawa H, Nakamoto H. Regulation of the groESL1 transcription by the HrcA repressor and a novel transcription factor Orf7.5 in the cyanobacterium Synechococcus elongatus PCC7942. J GEN APPL MICROBIOL 2020; 66:85-92. [PMID: 32281544 DOI: 10.2323/jgam.2020.02.001] [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: 01/16/2023]
Abstract
The CIRCE/HrcA system is highly conserved in cyanobacterial genomes. We have shown that heat-shock induction of the groESL1 operon in the cyanobacterium Synechocystis sp. PCC6803 is negatively regulated by the CIRCE/HrcA system. In Synechococcus elongatus PCC7942, a novel heat shock protein, Orf7.5, is involved in positive regulation of the groESL1 transcription. However, Orf7.5 is not conserved in some cyanobacteria, including Synechocystis sp. PCC6803. The purpose of this study is to evaluate the functional conservation of the CIRCE/HrcA system in S. elongatus PCC7942 and to understand the interplay between the CIRCE/HrcA system and the Orf7.5 regulatory system. We constructed single and double mutants of S. elongatus orf7.5, hrcA and orf7.5/hrcA and heat induction of the groESL1 transcription in these mutants was analyzed. Unexpectedly, derepression of the groESL1 transcription in an hrcA mutant was not observed. In all these mutants, the transcription was greatly suppressed under both normal and heat stress conditions, indicating that both HrcA and Orf7.5 are involved in regulation of the groESL1 transcription in a positive way. Consistent with the decrease in the groESL1 mRNA level, all the single and double mutants showed a great loss of acquired thermotolerance. Heat induction of the orf7.5 promoter activity was totally diminished in the orf7.5 mutant, indicating that Orf7.5 activates its own transcription. Yeast two hybrid analysis showed that the principle sigma factor RpoD1 interacts with Orf7.5. These results indicate that Orf7.5 enhances the transcription of groESL1 and orf7.5 by interacting with RpoD1.
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Affiliation(s)
- Masakazu Saito
- Department of Bioscience, Tokyo University of Agriculture.,Molecular Biology Course, Graduate School of Science and Engineering, Saitama University
| | | | | | | | - Hitoshi Nakamoto
- Molecular Biology Course, Graduate School of Science and Engineering, Saitama University
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7
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Hasegawa H, Tsurumaki T, Kobayashi I, Imamura S, Tanaka K. Identification and analysis of a principal sigma factor interacting protein SinA, essential for growth at high temperatures in a cyanobacterium Synechococcus elongatus PCC 7942. J GEN APPL MICROBIOL 2020; 66:66-72. [DOI: 10.2323/jgam.2019.05.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Hazuki Hasegawa
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology
- School of Life Science and Technology, Tokyo Institute of Technology
| | - Tatsuhiro Tsurumaki
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology
- School of Life Science and Technology, Tokyo Institute of Technology
| | - Ikki Kobayashi
- Department of Applied Chemistry and Biotechnology, Chiba University
| | - Sousuke Imamura
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology
| | - Kan Tanaka
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology
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8
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Motomura K, Sano K, Watanabe S, Kanbara A, Gamal Nasser AH, Ikeda T, Ishida T, Funabashi H, Kuroda A, Hirota R. Synthetic Phosphorus Metabolic Pathway for Biosafety and Contamination Management of Cyanobacterial Cultivation. ACS Synth Biol 2018; 7:2189-2198. [PMID: 30203964 DOI: 10.1021/acssynbio.8b00199] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Recent progress in genetic engineering and synthetic biology have greatly expanded the production capabilities of cyanobacteria, but concerns regarding biosafety issues and the risk of contamination of cultures in outdoor culture conditions remain to be resolved. With this dual goal in mind, we applied the recently established biological containment strategy based on phosphite (H3PO3, Pt) dependency to the model cyanobacterium Synechococcus elongatus PCC 7942 ( Syn 7942). Pt assimilation capability was conferred on Syn 7942 by the introduction of Pt dehydrogenase (PtxD) and hypophosphite transporter (HtxBCDE) genes that allow the uptake of Pt, but not phosphate (H3PO4, Pi). We then identified and disrupted the two indigenous Pi transporters, pst (Synpcc7942_2441 to 2445) and pit (Synpcc7942_0184). The resultant strain failed to grow on any media containing various types of P compounds other than Pt. The strain did not yield any escape mutants for at least 28 days with a detection limit of 3.6 × 10-11 per colony forming unit, and rapidly lost viability in the absence of Pt. Moreover, growth competition of the Pt-dependent strain with wild-type cyanobacteria revealed that the Pt-dependent strain could dominate in cultures containing Pt as the sole P source. Because Pt is rarely available in aquatic environments this strategy can contribute to both biosafety and contamination management of genetically engineered cyanobacteria.
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Affiliation(s)
- Kei Motomura
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
- Advanced Low Carbon Technology Research and Development Program, Japan Science and Technology Agency (JST-ALCA), Chiyoda-ku, Tokyo 102-0076, Japan
| | - Kosuke Sano
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - Satoru Watanabe
- Advanced Low Carbon Technology Research and Development Program, Japan Science and Technology Agency (JST-ALCA), Chiyoda-ku, Tokyo 102-0076, Japan
- Department of Bioscience, Tokyo University of Agriculture, Tokyo 156-8502, Japan
| | - Akihiro Kanbara
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - Abdel-Hady Gamal Nasser
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - Takeshi Ikeda
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - Takenori Ishida
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - Hisakage Funabashi
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | - Akio Kuroda
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
- Advanced Low Carbon Technology Research and Development Program, Japan Science and Technology Agency (JST-ALCA), Chiyoda-ku, Tokyo 102-0076, Japan
| | - Ryuichi Hirota
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
- Advanced Low Carbon Technology Research and Development Program, Japan Science and Technology Agency (JST-ALCA), Chiyoda-ku, Tokyo 102-0076, Japan
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9
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Ibrahim IM, Wang L, Puthiyaveetil S, Krauß N, Nield J, Allen JF. Oligomeric states in sodium ion-dependent regulation of cyanobacterial histidine kinase-2. PROTOPLASMA 2018; 255:937-952. [PMID: 29290041 PMCID: PMC5904244 DOI: 10.1007/s00709-017-1196-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 12/05/2017] [Indexed: 06/07/2023]
Abstract
Two-component signal transduction systems (TCSs) consist of sensor histidine kinases and response regulators. TCSs mediate adaptation to environmental changes in bacteria, plants, fungi and protists. Histidine kinase 2 (Hik2) is a sensor histidine kinase found in all known cyanobacteria and as chloroplast sensor kinase in eukaryotic algae and plants. Sodium ions have been shown to inhibit the autophosphorylation activity of Hik2 that precedes phosphoryl transfer to response regulators, but the mechanism of inhibition has not been determined. We report on the mechanism of Hik2 activation and inactivation probed by chemical cross-linking and size exclusion chromatography together with direct visualisation of the kinase using negative-stain transmission electron microscopy of single particles. We show that the functional form of Hik2 is a higher-order oligomer such as a hexamer or octamer. Increased NaCl concentration converts the active hexamer into an inactive tetramer. The action of NaCl appears to be confined to the Hik2 kinase domain.
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Affiliation(s)
- Iskander M Ibrahim
- Department of Biochemistry and Purdue Center for Plant Biology, Purdue University, West Lafayette, IN, USA
- School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
| | - Liang Wang
- School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
| | - Sujith Puthiyaveetil
- Department of Biochemistry and Purdue Center for Plant Biology, Purdue University, West Lafayette, IN, USA
- School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
| | - Norbert Krauß
- Botanisches Institut, Karlsruher Institut für Technologie, Karlsruhe, Germany
| | - Jon Nield
- School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
| | - John F Allen
- Research Department of Genetics, Evolution and Environment, University College London, London, UK.
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Nakamoto H, Kojima K. Non-housekeeping, non-essential GroEL (chaperonin) has acquired novel structure and function beneficial under stress in cyanobacteria. PHYSIOLOGIA PLANTARUM 2017; 161:296-310. [PMID: 28597961 DOI: 10.1111/ppl.12595] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 05/17/2017] [Accepted: 05/30/2017] [Indexed: 06/07/2023]
Abstract
GroELs which are prokaryotic members of the chaperonin (Cpn)/Hsp60 family are molecular chaperones of which Escherichia coli GroEL is a model for subsequent research. The majority of bacterial species including E. coli and Bacillus subtilis have only one essential groEL gene that forms an operon with the co-chaperone groES gene. In contrast to these model bacteria, two or three groEL genes exist in cyanobacterial genomes. One of them, groEL2, does not form an operon with the groES gene, whereas the other(s) does. In the case of cyanobacteria containing two GroEL homologs, one of the GroELs, GroEL1, substitutes for the native GroEL in an E. coli cell, but GroEL2 does not. Unlike the E. coli GroEL, GroEL2 is not essential, but it plays an important role which is not substitutable by GroEL1 under stress. Regulation of expression and biochemical properties of GroEL2 are different/diversified from GroEL1 and E. coli GroEL in many aspects. We postulate that the groEL2 gene has acquired a novel, beneficial function especially under stresses and become preserved by natural selection, with the groEL1 gene retaining the original, house-keeping function. In this review, we will focus on difference between the two GroELs in cyanobacteria, and divergence of GroEL2 from the E. coli GroEL. We will also compare cyanobacterial GroELs with the chloroplast Cpns (60α and 60β) which are thought to be evolved from the cyanobacterial GroEL1. Chloroplast Cpns appear to follow the different path from cyanobacterial GroELs in the evolution after gene duplication of the corresponding ancestral groEL gene.
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Affiliation(s)
- Hitoshi Nakamoto
- Department of Biochemistry and Molecular Biology, Graduate School of Science and Engineering, Saitama University, Saitama, Japan
| | - Kouji Kojima
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
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