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Zhu X, Liang S, Yin J, Yuan C, Wang J, Li W, He M, Wang J, Chen W, Ma B, Wang Y, Qin P, Li S, Chen X. The DnaJ OsDjA7/8 is essential for chloroplast development in rice (Oryza sativa). Gene 2015. [PMID: 26210810 DOI: 10.1016/j.gene.2015.07.067] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
DnaJ proteins belong to chaperones of Hsp40 family that ubiquitously participate in various cellular processes. Previous studies have shown chloroplast-targeted DnaJs are involved in the development of chloroplast in some plant species. However, little is known about the function of DnaJs in rice, one of the main staple crops. In this study, we characterized a type I DnaJ protein OsDjA7/8. We found that the gene OsDjA7/8 was expressed in all collected tissues, with a priority in the vigorous growth leaf. Subcellular localization revealed that the protein OsDjA7/8 was mainly distributed in chloroplast. Reduced expression of OsDjA7/8 in rice led to albino lethal at the seedling stage. Transmission electron microscopy observation showed that the chloroplast structures were abnormally developed in the plants silenced for OsDjA7/8. In addition, the transcriptional expression of the genes tightly associated with the development of chloroplast was deeply reduced in the plants silenced for OsDjA7/8. Collectively, our study reveals that OsDjA7/8 encodes a chloroplast-localized protein and is essential for chloroplast development and differentiation in rice.
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Affiliation(s)
- Xiaobo Zhu
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Sihui Liang
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Junjie Yin
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Can Yuan
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Jing Wang
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Weitao Li
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Min He
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Jichun Wang
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Weilan Chen
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Bingtian Ma
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Yuping Wang
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Peng Qin
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Shigui Li
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China
| | - Xuewei Chen
- Rice Research Institute, Key Laboratory of Major Crop Diseases, Sichuan Agricultural University at Wenjiang, Chengdu, Sichuan 611130, China; State Key Laboratory of Hybrid Rice, Collaborative Innovation Center for Hybrid Rice in Yangtze River Basin at Sichuan, Chengdu 611130, China.
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Chen KM, Holmström M, Raksajit W, Suorsa M, Piippo M, Aro EM. Small chloroplast-targeted DnaJ proteins are involved in optimization of photosynthetic reactions in Arabidopsis thaliana. BMC PLANT BIOLOGY 2010; 10:43. [PMID: 20205940 PMCID: PMC2844072 DOI: 10.1186/1471-2229-10-43] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Accepted: 03/07/2010] [Indexed: 05/19/2023]
Abstract
BACKGROUND DnaJ proteins participate in many metabolic pathways through dynamic interactions with various components of these processes. The role of three small chloroplast-targeted DnaJ proteins, AtJ8 (At1 g80920), AtJ11 (At4 g36040) and AtJ20 (At4 g13830), was investigated here using knock-out mutants of Arabidopsis thaliana. Photochemical efficiency, capacity of CO2 assimilation, stabilization of Photosystem (PS) II dimers and supercomplexes under high light illumination, energy distribution between PSI and PSII and phosphorylation of PSII-LHCII proteins, global gene expression profiles and oxidative stress responses of these DnaJ mutants were analyzed. RESULTS Knockout of one of these proteins caused a series of events including a decrease in photosynthetic efficiency, destabilization of PSII complexes and loss of control for balancing the redox reactions in chloroplasts. Data obtained with DNA microarray analysis demonstrated that the lack of one of these DnaJ proteins triggers a global stress response and therefore confers the plants greater tolerance to oxidative stress induced by high light or methyl viologen treatments. Expression of a set of genes encoding enzymes that detoxify reactive oxygen species (ROS) as well as a number of stress-related transcription factors behaved in the mutants at growth light similarly to that when wild-type (WT) plants were transferred to high light. Also a set of genes related to redox regulation were upregulated in the mutants. On the other hand, although the three DnaJ proteins reside in chloroplasts, the expression of most genes encoding thylakoid membrane proteins was not changed in the mutants. CONCLUSION It is proposed that the tolerance of the DnaJ protein knockout plants to oxidative stress occurs at the expense of the flexibility of photosynthetic reactions. Despite the fact that the effects of the individual protein knockout on the response of plants to high light treatment are quite similar, it is conceivable that both specific- and cross-talk functions exist between the three small chloroplast-targeted DnaJ proteins, AtJ8, AtJ11 and AtJ20.
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Affiliation(s)
- Kun-Ming Chen
- Institute of Crop Sciences, College of Agriculture and Biotechnology, Zhejiang University, 310029 Hangzhou, China
| | - Maija Holmström
- Department of Biochemistry and Food Chemistry, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
| | - Wuttinun Raksajit
- Department of Biochemistry and Food Chemistry, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
| | - Marjaana Suorsa
- Department of Biochemistry and Food Chemistry, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
| | - Mirva Piippo
- Department of Biochemistry and Food Chemistry, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
| | - Eva-Mari Aro
- Department of Biochemistry and Food Chemistry, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
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Brunt SA, Silver JC. Molecular cloning and characterization of two different cDNAs encoding the molecular chaperone Hsp90 in the Oomycete Achlya ambisexualis. Fungal Genet Biol 2004; 41:239-52. [PMID: 14732269 DOI: 10.1016/j.fgb.2003.08.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The chaperone Hsp90 plays a key role in the maturation and activation of many 'client' proteins in eukaryotic cells. In the oomycete Achlya ambisexualis two populations of hsp90 transcripts that differ slightly in size (2.8 and 2.9 kb) are present in heat-shocked mycelia. Only the 2.8 kb transcripts are seen in vegetative mycelia and in mycelia undergoing antheridiol-induced differentiation. Two different hsp90 cDNAs were isolated and characterized. Although nearly identical, an additional eight nucleotide sequence was present at the end of the 3'UTR of one of the two cDNAs. RT-PCR analyses indicated that hsp90 transcripts containing the eight nucleotide extension, were present only in heat-shocked mycelia. Hsp90 transcripts lacking this sequence were present in vegetative mycelia and the levels of these transcripts increased in both heat-shocked and hormone-treated mycelia. Each hsp90 cDNA encoded a nearly identical Hsp90 protein. However, two Hsp90 proteins (86 and 84 kDa) were observed on immunoblots of mycelial proteins. Only one of these, i.e., the 86 kDa protein was detected by an anti-phosphoserine antibody, suggesting that the difference in mass of the two Hsp90 isoforms, was due at least in part, to different levels of phosphoserine residues.
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Affiliation(s)
- Shelley A Brunt
- Department of Medical Genetics and Microbiology and Department of Life Sciences, University of Toronto at Scarborough, Toronto, Ont., Canada M1C 1A4
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