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Hýsková V, Bělonožníková K, Šmeringaiová I, Kavan D, Ingr M, Ryšlavá H. How is the activity of shikimate dehydrogenase from the root of Petroselinum crispum (parsley) regulated and which side reactions are catalyzed? PHYTOCHEMISTRY 2021; 190:112881. [PMID: 34365296 DOI: 10.1016/j.phytochem.2021.112881] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 05/18/2021] [Accepted: 07/06/2021] [Indexed: 06/13/2023]
Abstract
Inhibitors of the shikimate pathway are widely used as herbicides, antibiotics, and anti-infectious drugs. However, the regulation of the shikimic pathway is complex, and little is known about the feedback regulation of the shikimate dehydrogenase (SDH, EC 1.1.1.25) in plants. Thus, the aim of this study was to elucidate the kinetic mechanism of SDH purified from the root of Petroselinum crispum (parsley), to determine all possible reaction products and to identify phenylpropanoid compounds that affect its activity. Our results showed that the bisubstrate reaction catalyzed by P. crispum SDH follows a sequential ordered mechanism, except for three dead-end complexes. The main and lateral reactions of SDH were monitored by mass spectrometry, thereby detecting protocatechuic acid as a byproduct. Gallic acid was formed non-enzymatically, whereas quinate was not detected. Several polyphenolic compounds inhibited SDH activity, especially tannic, caffeic and chlorogenic acids, with IC50 0.014 mM, 0.15 mM, and 0.19 mM, respectively. The number of hydroxyl groups influenced their inhibition effect on SDH, and p-coumaric, t-ferulic, sinapic, syringic and salicylic acids were less effective SDH inhibitors. Nevertheless, one branch of the phenylpropanoid pathway may affect SDH activity through feedback regulation.
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Affiliation(s)
- Veronika Hýsková
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2, 128 40, Czech Republic.
| | - Kateřina Bělonožníková
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2, 128 40, Czech Republic.
| | - Ingrida Šmeringaiová
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2, 128 40, Czech Republic.
| | - Daniel Kavan
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2, 128 40, Czech Republic.
| | - Marek Ingr
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2, 128 40, Czech Republic; Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Materials Engineering, Nám. T.G. Masaryka 5555, 760 01, Zlín, Czech Republic.
| | - Helena Ryšlavá
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2, 128 40, Czech Republic.
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Wang J, Gao H, Guo Z, Meng Y, Yang M, Li X, Yang Q. Adaptation responses in C 4 photosynthesis of sweet maize (Zea mays L.) exposed to nicosulfuron. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 214:112096. [PMID: 33647854 DOI: 10.1016/j.ecoenv.2021.112096] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 02/19/2021] [Accepted: 02/20/2021] [Indexed: 06/12/2023]
Abstract
Nicosulfuron is an ingredient in photosynthesis-inhibiting herbicides and has been widely used in corn post-emergence weed control. In the current study, a pair of sister lines, HK301 (nicosulfuron-tolerence, NT) and HK320 (nicosulfuron-sensitive, NS), was used to study the effect of nicosulfuron in sweet maize seedlings on C4 photosynthetic enzymes and non-enzymatic substances, expression levels of key enzymes, and chloroplast structure. Nicosulfuron was sprayed at the four-leaf stage, and water was sprayed as a control. After nicosulfuron treatment, phosphoenolpyruvate carboxylase (PEPC), NADP-malic dehydrogenase (NADP-MDH), NADP-malic enzyme (NADP-ME), pyruvate orthophosphate dikinase (PPDK), and ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activities of NT were significantly higher than those of NS. Compared to NT, malate, oxaloacetic acid, and pyruvic acid significantly decreased as exposure time increased in NS. Compared to NS, nicosulfuron treatment significantly increased the expression levels of PEPC, NADP-MDH, NADP-ME, PPDK, and Rubisco genes in NT. Under nicosulfuron treatment, chloroplast ultrastructure of NS, compared to that of NT, nicosulfuron induced swelling of the chloroplast volume and reduced starch granules in NS. In general, our results indicate that in different resistant sweet maize, C4 photosynthetic enzymes activity and key genes expression play a critical role in enhancing the adaptability of plants to nicosulfuron stress at a photosynthetic physiological level.
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Affiliation(s)
- Jian Wang
- College of Agronomy and Biotechnology, Hebei Key Laboratory of Crop Stress Biology, Hebei Normal University of Science &Technology, Qinhuangdao 066000, Hebei Province, China.
| | - Hui Gao
- College of Agronomy and Biotechnology, Hebei Key Laboratory of Crop Stress Biology, Hebei Normal University of Science &Technology, Qinhuangdao 066000, Hebei Province, China
| | - Zhenqing Guo
- College of Agronomy and Biotechnology, Hebei Key Laboratory of Crop Stress Biology, Hebei Normal University of Science &Technology, Qinhuangdao 066000, Hebei Province, China
| | - Yanyu Meng
- College of Agronomy and Biotechnology, Hebei Key Laboratory of Crop Stress Biology, Hebei Normal University of Science &Technology, Qinhuangdao 066000, Hebei Province, China
| | - Min Yang
- College of Agronomy and Biotechnology, Hebei Key Laboratory of Crop Stress Biology, Hebei Normal University of Science &Technology, Qinhuangdao 066000, Hebei Province, China
| | - Xiangling Li
- College of Agronomy and Biotechnology, Hebei Key Laboratory of Crop Stress Biology, Hebei Normal University of Science &Technology, Qinhuangdao 066000, Hebei Province, China
| | - Qing Yang
- College of Agronomy and Biotechnology, Hebei Key Laboratory of Crop Stress Biology, Hebei Normal University of Science &Technology, Qinhuangdao 066000, Hebei Province, China.
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Zhang X, Pu P, Tang Y, Zhang L, Lv J. C4 photosynthetic enzymes play a key role in wheat spike bracts primary carbon metabolism response under water deficit. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2019; 142:163-172. [PMID: 31299598 DOI: 10.1016/j.plaphy.2019.06.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 06/11/2019] [Accepted: 06/11/2019] [Indexed: 05/15/2023]
Abstract
C4 photosynthetic enzymes are present in C3 plants and participate in non-photosynthetic metabolism. Wheat spike bracts had a higher drought tolerance, photosynthesis and senesced later compared to the flag leaves under water deficit. This research was conducted to investigate the different response of primary carbon metabolism induced by C4 photosynthetic enzymes in wheat flag leaves and spike bracts including glumes and lemmas under water deficit. The activities of C4 photosynthetic enzymes and Ribulose bisphosphate carboxylase oxygenase (Rubisco), the expression of related genes and primary carbon metabolism contents were demonstrated in wheat flag leaves and spike bracts exposed to water deficit. Results showed that drought stress strongly inhibited wheat photosynthetic metabolism by decreasing Rubisco activity in flag leaves. The activities of phosphoenolpyruvate carboxylase (PEPC), NADP-malic enzyme (NADP-ME), phosphate dikinase (PPDK) and NADP- malic dehydrogenase (NADP-MDH) increased in wheat spike bracts under water deficit. Transcript levels of C4 photosynthetic genes in wheat spike bracts were higher under water deficit than that of control. Furthermore, the results indicated that drought stress induced changes in the contents of primary carbon metabolism including malate, oxaloacetic acid (OAA), citric, fumaric acid were organ-specific. In conclusion, the functions of C4 photosynthetic enzymes appear to be important for wheat spike bracts primary carbon metabolism and defence response under drought stress.
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Affiliation(s)
- Xu Zhang
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, PR China
| | - Peng Pu
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, PR China
| | - Yan Tang
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, PR China
| | - Lixin Zhang
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, PR China
| | - Jinyin Lv
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, PR China.
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Ryšlavá H, Valenta R, Hýsková V, Křížek T, Liberda J, Coufal P. Purification and enzymatic characterization of tobacco leaf β-N-acetylhexosaminidase. Biochimie 2014; 107 Pt B:263-9. [PMID: 25242193 DOI: 10.1016/j.biochi.2014.09.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Accepted: 09/05/2014] [Indexed: 01/17/2023]
Abstract
The kinetic properties of β-N-acetylhexosaminidase purified from tobacco (Nicotiana tabacum L.) leaves have been investigated. In addition to chromogenic pNP derivates, N,N'-diacetylchitobiose and N,N',N″-triacetylchitotriose were also used as substrates of β-N-acetylhexosaminidase. The highest reaction rate and the affinity for the substrate were observed for pNP-GlcNAc; however, an excess of this substrate inhibits the reaction. The reaction rate with pNP-GalNAc as the substrate was found to be about 85% of that obtained with pNP-GlcNAc. The hydrolysis of acetylated chitooligomers by β-N-acetylhexosaminidase followed by separation and quantification using capillary electrophoresis was slower compared to pNP-GlcNAc. The pH optimum of β-N-acetylhexosaminidase for individual substrates was found at 4.3-5.0 and the temperature optimum was 50-55 °C. Gel permeation chromatography and red native electrophoresis determined the relative molecular weight as 280 000 and the isoelectric point as 5.3. The inhibition of β-N-acetylhexosaminidase by monosaccharides GlcN, GalN, GlcNAc, GalNAc in combination with substrates pNP-GlcNAc and pNP-GalNAc was studied and the type of inhibition and the inhibition constants were determined.
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Affiliation(s)
- Helena Ryšlavá
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2 128 40, Czech Republic.
| | - Robert Valenta
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2 128 40, Czech Republic
| | - Veronika Hýsková
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2 128 40, Czech Republic
| | - Tomáš Křížek
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2 128 40, Czech Republic
| | - Jiří Liberda
- Department of Biochemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2 128 40, Czech Republic
| | - Pavel Coufal
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 2030, Prague 2 128 40, Czech Republic
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Dráb T, Kračmerová J, Tichá I, Hanzlíková E, Tichá M, Ryšlavá H, Doubnerová V, Maňásková-Postlerová P, Liberda J. Native Red Electrophoresis - A new method suitable for separation of native proteins. Electrophoresis 2011; 32:3597-9. [DOI: 10.1002/elps.201100310] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Dráb T, Kračmerová J, Tichá I, Hanzlíková E, Tichá M, Liberda J. Native polyacrylamide electrophoresis in the presence of Ponceau Red to study oligomeric states of protein complexes. J Sep Sci 2011; 34:1692-5. [DOI: 10.1002/jssc.201000869] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Revised: 04/19/2011] [Accepted: 04/26/2011] [Indexed: 11/07/2022]
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Doubnerová V, Ryšlavá H. What can enzymes of C₄ photosynthesis do for C₃ plants under stress? PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2011; 180:575-83. [PMID: 21421406 DOI: 10.1016/j.plantsci.2010.12.005] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2010] [Revised: 12/05/2010] [Accepted: 12/08/2010] [Indexed: 05/18/2023]
Abstract
Phosphoenolpyruvate carboxylase (PEPC), NADP-malic enzyme (NADP-ME), and pyruvate, phosphate dikinase (PPDK) participate in the process of concentrating CO₂ in C₄ photosynthesis. Non-photosynthetic counterparts of these enzymes, which are present in all plants, play important roles in the maintenance of pH and replenishment of Krebs cycle intermediates, thereby contributing to the biosynthesis of amino acids and other compounds and providing NADPH for biosynthesis and the antioxidant system. Enhanced activities of PEPC and/or NADP-ME and/or PPDK were found in plants under various types of abiotic stress, such as drought, high salt concentration, ozone, the absence of phosphate and iron or the presence of heavy metals in the soil. Moreover, the activities of all of these enzymes were enhanced in plants under biotic stress caused by viral infection. The functions of PEPC, NADP-ME and PPDK appear to be more important for plants under stress than under optimal growth conditions.
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Affiliation(s)
- Veronika Doubnerová
- Department of Biochemistry, Faculty of Natural Science, Charles University in Prague, Hlavova 2030, 12840 Prague, Czech Republic.
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Effect of Potato virus Y on the NADP-malic enzyme from Nicotiana tabacum L.: mRNA, expressed protein and activity. Int J Mol Sci 2009; 10:3583-98. [PMID: 20111689 PMCID: PMC2812832 DOI: 10.3390/ijms10083583] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2009] [Revised: 08/07/2009] [Accepted: 08/11/2009] [Indexed: 11/16/2022] Open
Abstract
The effect of biotic stress induced by viral infection (Potato virus Y, strain NTN and O) on NADP-malic enzyme (EC 1.1.1.40) in tobacco plants (Nicotiana tabacum L., cv. Petit Havana, SR1) was tested at the transcriptional, translational and activity level. The increase of enzyme activity in infected leaves was correlated with the increased amount of expressed protein and with mRNA of cytosolic NADP-ME isoform. Transcription of the chloroplastic enzyme was not influenced by viral infection. The increase of the enzyme activity was also detected in stems and roots of infected plants. The effect of viral infection induced by Potato virus Y, NTN strain, causing more severe symptoms, was compared with the effect induced by milder strain PVYO. The observed increase in NADP-malic enzyme activity in all parts of the studied plants was higher in the case of PVYNTN strain than in the case of strain PVYO. The relevance of NADP-malic enzyme in plants under stress conditions was discussed.
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The regulation and catalytic mechanism of the NADP-malic enzyme from tobacco leaves. JOURNAL OF THE SERBIAN CHEMICAL SOCIETY 2009. [DOI: 10.2298/jsc0909893d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The non-photosynthetic NADP-malic enzyme EC 1.1.1.40 (NADP-ME), which catalyzes the oxidative decarboxylation of L-malate and NADP+ to produce pyruvate and NADPH, respectively, and which could be involved in plant defense responses, was isolated from Nicotiana tabacum L. leaves. The mechanism of the enzyme reaction was studied by the initial rate method and was found to be an ordered sequential one. Regulation possibilities of purified cytosolic NADP-ME by cell metabolites were tested. Intermediates of the citric acid cycle (?-ketoglutarate, succinate, fumarate), metabolites of glycolysis (pyruvate, phosphoenolpyruvate, glucose-6-phosphate), compounds connected with lipogenesis (coenzyme A, acetyl-CoA, palmitoyl-CoA) and some amino acids (glutamate, glutamine, aspartate) did not significantly affect the NADP-ME activity from tobacco leaves. In contrast, macroergic compounds (GTP, ATP and ADP) were strong inhibitors of NADP-ME; the type of inhibition and the inhibition constants were determined in the presence of the most effective cofactors (Mn2+ or Mg2+), required by NADP-ME. Predominantly non-competitive type of inhibitions of NADP-ME with respect to NADP+ and mixed type to L-malate were found.
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