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Wang CS, Jiang QT, Ma J, Wang XY, Wang JR, Chen GY, Qi PF, Peng YY, Lan XJ, Zheng YL, Wei YM. Characterization and expression analyses of the H⁺-pyrophosphatase gene in rye. J Genet 2017; 95:565-72. [PMID: 27659326 DOI: 10.1007/s12041-016-0664-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The H⁺-pyrophosphatase (H⁺-PPase) gene plays an important role in maintaining intracellular proton gradients. Here, we characterized the full-length complementary DNA (cDNA) and DNA of the H⁺-PPase gene ScHP1 in rye (Secale cereale L. 'Qinling'). We determined the subcellular localization of this gene and predicted the corresponding protein structure. We analysed the evolutionary relationship between ScHP1 and H⁺-PPase genes in other species, and did real-time quantitative polymerase chain reaction to explore the expression patterns of ScHP1 in rye plants subjected to N, P and K deprivation and to cold, high-salt and drought stresses. ScHP1 cDNA included a 2289 bp open reading frame (ORF) encoding 762 amino acid residues with 14 transmembrane domains. The genomic ScHP1 DNA was 4354 bp and contained eight exons and seven introns. ScHP1 was highly homologous with other members of the H⁺-PPase gene family. When the full-length ORF was inserted into the expression vector pA7-YFP, the fluorescent microscopy revealed that ScHP1-YFP fusion protein was located in the plasma membrane. Rye plants that were subjected to N deprivation, cold and high-salt stresses, ScHP1 expression was higher in the leaves than roots. Conversely, plants subjected to P and K deprivation and drought stress, ScHP1 expression was higher in the roots than leaves. Under all the investigated stress conditions, expression of ScHP1 was lower in the stem than in the leaves and roots. Our results imply that ScHP1 functions under abiotic stress response.
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Affiliation(s)
- Chang-Shui Wang
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu, Sichuan 611130, People's Republic of
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Chiu FS, Hsu SH, Chen JH, Hsiao YY, Pan YJ, Van RC, Huang YT, Tseng FG, Chou WM, Fan SK, Pan RL. Differential response of vacuolar proton pumps to osmotica. FUNCTIONAL PLANT BIOLOGY : FPB 2006; 33:195-206. [PMID: 32689226 DOI: 10.1071/fp03248] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2003] [Accepted: 10/05/2005] [Indexed: 06/11/2023]
Abstract
The vacuole is a fundamental and dominant organelle and occupies a large part of the total cell volume in most mature plant cells. The higher-plant vacuole contains two types of proton-translocating pumps, H+-ATPase (EC 3.6.1.3) and H+-pyrophosphatase (EC 3.6.1.1), residing on the same membrane. These two enzymes generate roughly equal proton gradients across the vacuolar membrane for the secondary transport of ions and metabolites. However, the pumps respond differentially to stress in order to maintain critical functions of the vacuole. In this work, tonoplasts from etiolated mung bean seedlings (Vigna radiata L.) were used to investigate the function of these two enzymes under high osmotic pressure. At high concentrations of sucrose or sorbitol, the light scattering and volume of isolated vesicles were progressively changed. Concomitantly, enzymatic activities, proton translocation, and coupling efficiencies of these two proton-pumping enzymes were inhibited to various extents under high osmotic pressure. No significant change in enzymatic activities of purified vacuolar H+-PPase and H+-ATPase under similar conditions was observed. We thus believe that the membrane structure is an important determinant for proper function of proton pumping systems of plant vacuoles. Furthermore, kinetic analysis shows different variation in apparent Vmax but not in KM values of vacuolar H+-PPase and H+-ATPase at high osmolarity of sucrose and sorbitol, respectively, suggesting probable alterations in substrate hydrolysis reactions but not substrate-binding affinity of the enzymes. A working model is proposed to interpret supplemental roles of vacuolar H+-PPase and H+-ATPase to maintain appropriate functions of plant tonoplasts.
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Affiliation(s)
- Fan S Chiu
- Department of Life Sciences and Institute of Bioinformatics and Structural Biology, College of Life Sciences, National Tsing Hua University, Hsin Chu 30043, Taiwan, Republic of China
| | - Shen H Hsu
- Department of Life Sciences and Institute of Bioinformatics and Structural Biology, College of Life Sciences, National Tsing Hua University, Hsin Chu 30043, Taiwan, Republic of China
| | - Jiun H Chen
- Department of Life Sciences and Institute of Bioinformatics and Structural Biology, College of Life Sciences, National Tsing Hua University, Hsin Chu 30043, Taiwan, Republic of China
| | - Yi Y Hsiao
- Department of Life Sciences and Institute of Bioinformatics and Structural Biology, College of Life Sciences, National Tsing Hua University, Hsin Chu 30043, Taiwan, Republic of China
| | - Yih J Pan
- Department of Life Sciences and Institute of Bioinformatics and Structural Biology, College of Life Sciences, National Tsing Hua University, Hsin Chu 30043, Taiwan, Republic of China
| | - Ru C Van
- Department of Life Sciences and Institute of Bioinformatics and Structural Biology, College of Life Sciences, National Tsing Hua University, Hsin Chu 30043, Taiwan, Republic of China
| | - Yun T Huang
- Department of Life Sciences and Institute of Bioinformatics and Structural Biology, College of Life Sciences, National Tsing Hua University, Hsin Chu 30043, Taiwan, Republic of China
| | - Fang G Tseng
- Department of Engineering and System Science, College of Nuclear Science, National Tsing Hua University, Hsin Chu 30043, Taiwan, Republic of China
| | - Wing M Chou
- Department of Biotechnology, National Formosa University, Huwei, Yunlin 63208, Taiwan, Republic of China
| | - Shih K Fan
- Institute of Nanotechnology, National Chiao Tung University, Hsin Chu 30013, Taiwan, Republic of China
| | - Rong L Pan
- Department of Life Sciences and Institute of Bioinformatics and Structural Biology, College of Life Sciences, National Tsing Hua University, Hsin Chu 30043, Taiwan, Republic of China
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