1
|
Takimoto R, Tatemichi Y, Aoki W, Kosaka Y, Minakuchi H, Ueda M, Kuroda K. A critical role of an oxygen-responsive gene for aerobic nitrogenase activity in Azotobacter vinelandii and its application to Escherichia coli. Sci Rep 2022; 12:4182. [PMID: 35264690 PMCID: PMC8907163 DOI: 10.1038/s41598-022-08007-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 02/28/2022] [Indexed: 12/02/2022] Open
Abstract
Since nitrogenase is irreversibly inactivated within a few minutes after exposure to oxygen, current studies on the heterologous expression of nitrogenase are limited to anaerobic conditions. This study comprehensively identified genes showing oxygen-concentration-dependent expression only under nitrogen-fixing conditions in Azotobacter vinelandii, an aerobic diazotroph. Among the identified genes, nafU, with an unknown function, was greatly upregulated under aerobic nitrogen-fixing conditions. Through replacement and overexpressing experiments, we suggested that nafU is involved in the maintenance of nitrogenase activity under aerobic nitrogenase activity. Furthermore, heterologous expression of nafU in nitrogenase-producing Escherichia coli increased nitrogenase activity under aerobic conditions by 9.7 times. Further analysis of NafU protein strongly suggested its localization in the inner membrane and raised the possibility that this protein may lower the oxygen concentration inside the cells. These findings provide new insights into the mechanisms for maintaining stable nitrogenase activity under aerobic conditions in A. vinelandii and provide a platform to advance the use of nitrogenase under aerobic conditions.
Collapse
Affiliation(s)
- Ren Takimoto
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Yuki Tatemichi
- Research and Development Division, Kikkoman Corporation, 338 Noda, Noda, Chiba, 278-0037, Japan
| | - Wataru Aoki
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Yuishin Kosaka
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | | | - Mitsuyoshi Ueda
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Kouichi Kuroda
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.
| |
Collapse
|
2
|
Tatemichi Y, Nakahara T, Ueda M, Kuroda K. Construction of recombinant Escherichia coli producing nitrogenase-related proteins from Azotobacter vinelandii. Biosci Biotechnol Biochem 2021; 85:2209-2216. [PMID: 34387317 DOI: 10.1093/bbb/zbab144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 08/05/2021] [Indexed: 11/12/2022]
Abstract
Biological nitrogen fixation by nitrogenase has attracted attention as an alternative method to chemical nitrogen fixation, which requires large amounts of fossil fuels. Azotobacter vinelandii, which produces an oxygen-sensitive nitrogenase, can fix nitrogen even under aerobic conditions; therefore, the heterologous expression of nif-related genes from A. vinelandii is a promising strategy for developing a biological nitrogen fixation method. We assembled 17 nif-related genes, which are scattered throughout the genome of A. vinelandii, into synthetic gene clusters by overlap-extension-PCR and seamless cloning and expressed them in Escherichia coli. The transcription and translation of the 17 nif-related genes were evaluated by RT-qPCR and LC-MS/MS, respectively. The constructed E. coli showed nitrogenase activity under anaerobic and microaerobic conditions. This strain would be a useful model for examining the effect of other genes from A. vinelandii on nitrogen fixation by expressing them in addition to the minimal set of nif-related genes.
Collapse
Affiliation(s)
- Yuki Tatemichi
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-Ku, Kyoto 606-8502, Japan.,Research and Development Division, Kikkoman Corporation, 338 Noda, Noda-City, Chiba 278-0037, Japan
| | - Takeharu Nakahara
- Research and Development Division, Kikkoman Corporation, 338 Noda, Noda-City, Chiba 278-0037, Japan
| | - Mitsuyoshi Ueda
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-Ku, Kyoto 606-8502, Japan
| | - Kouichi Kuroda
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-Ku, Kyoto 606-8502, Japan
| |
Collapse
|
3
|
Watanabe Y, Kuroda K, Tatemichi Y, Nakahara T, Aoki W, Ueda M. Construction of engineered yeast producing ammonia from glutamine and soybean residues (okara). AMB Express 2020; 10:70. [PMID: 32296960 PMCID: PMC7158961 DOI: 10.1186/s13568-020-01011-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 04/07/2020] [Indexed: 11/10/2022] Open
Abstract
Ammonia is an essential substance for agriculture and the chemical industry. The intracellular production of ammonia in yeast (Saccharomyces cerevisiae) by metabolic engineering is difficult because yeast strongly assimilates ammonia, and the knockout of genes enabling this assimilation is lethal. Therefore, we attempted to produce ammonia outside the yeast cells by displaying a glutaminase (YbaS) from Escherichia coli on the yeast cell surface. YbaS-displaying yeast successfully produced 3.34 g/L ammonia from 32.6 g/L glutamine (83.2% conversion rate), providing it at a higher yield than in previous studies. Next, using YbaS-displaying yeast, we also succeeded in producing ammonia from glutamine in soybean residues (okara) produced as food waste from tofu production. Therefore, ammonia production outside cells by displaying ammonia-lyase on the cell surface is a promising strategy for producing ammonia from food waste as a novel energy resource, thereby preventing food loss.
Collapse
|
4
|
Li B, Terazono Y, Hirasaki N, Tatemichi Y, Kinoshita E, Obata A, Matsui T. Inhibition of Glucose Transport by Tomatoside A, a Tomato Seed Steroidal Saponin, through the Suppression of GLUT2 Expression in Caco-2 Cells. J Agric Food Chem 2018; 66:1428-1434. [PMID: 29355315 DOI: 10.1021/acs.jafc.7b06078] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We investigated whether tomatoside A (5α-furostane-3β,22,26-triol-3-[O-β-d-glucopyranosyl (1→2)-β-d-glucopyranosyl (1→4)-β-d-galactopyranoside] 26-O-β-d-glucopyranoside), a tomato seed saponin, may play a role in the regulation of intestinal glucose transport in human intestinal Caco-2 cells. Tomatoside A could not penetrate through Caco-2 cell monolayers, as observed in the transport experiments using liquid chromatography-mass spectrometry. The treatment of cells with 10 μM tomatoside A for 3 h resulted in a 46.0% reduction in glucose transport as compared to untreated cells. Western blotting analyses revealed that tomatoside A significantly (p < 0.05) suppressed the expression of glucose transporter 2 (GLUT2) in Caco-2 cells, while no change in the expression of sodium-dependent glucose transporter 1 was observed. In glucose transport experiments, the reduced glucose transport by tomatoside A was ameliorated by a protein kinase C (PKC) inhibitor and a multidrug resistance-associated protein 2 (MRP2) inhibitor. The tomatoside A-induced reduction in glucose transport was restored in cells treated with apical sodium-dependent bile acid transporter (ASBT) siRNA or an ASBT antagonist. These findings demonstrated for the first time that the nontransportable tomato seed steroidal saponin, tomatoside A, suppressed GLUT2 expression via PKC signaling pathway during the ASBT-influx/MRP2-efflux process in Caco-2 cells.
Collapse
Affiliation(s)
- Baorui Li
- Department of Bioscience and Biotechnology, Division of Bioresource and Bioenvironmental Sciences, Faculty of Agriculture, Graduated School of Kyushu University , 6-10-1 Hakozaki, Fukuoka 812-8581, Japan
| | - Yusuke Terazono
- Department of Bioscience and Biotechnology, Division of Bioresource and Bioenvironmental Sciences, Faculty of Agriculture, Graduated School of Kyushu University , 6-10-1 Hakozaki, Fukuoka 812-8581, Japan
| | - Naoto Hirasaki
- Department of Bioscience and Biotechnology, Division of Bioresource and Bioenvironmental Sciences, Faculty of Agriculture, Graduated School of Kyushu University , 6-10-1 Hakozaki, Fukuoka 812-8581, Japan
| | - Yuki Tatemichi
- Research & Development Division, Kikkoman Co. , 399 Noda, Chiba 278-0037, Japan
| | - Emiko Kinoshita
- Research & Development Division, Kikkoman Co. , 399 Noda, Chiba 278-0037, Japan
| | - Akio Obata
- Research & Development Division, Kikkoman Co. , 399 Noda, Chiba 278-0037, Japan
| | - Toshiro Matsui
- Department of Bioscience and Biotechnology, Division of Bioresource and Bioenvironmental Sciences, Faculty of Agriculture, Graduated School of Kyushu University , 6-10-1 Hakozaki, Fukuoka 812-8581, Japan
| |
Collapse
|
5
|
Katayama H, Tatemichi Y, Nakajima A. Simultaneous quantification of twenty Amadori products in soy sauce using liquid chromatography-tandem mass spectrometry. Food Chem 2017; 228:279-286. [PMID: 28317725 DOI: 10.1016/j.foodchem.2017.02.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 01/19/2017] [Accepted: 02/01/2017] [Indexed: 11/17/2022]
Abstract
A liquid chromatography-tandem mass spectrometry method using a pentafluorophenylpropyl-bonded silica column was developed to simultaneously quantify twenty Amadori products (APs), including N-(1-Deoxy-d-fructosyl-1-yl)-l-isoleucine (Fru-Ile) and N-(1-Deoxy-d-fructosyl-1-yl)-l-leucine (Fru-Leu), in soy sauce, without the need for an ion-pairing reagent or sample derivatization. The method was applied to six types of soy sauce, to determine the total AP levels and the levels of individual APs. The level of total APs widely varied between the eight samples, from 358mg/L to 24347mg/L. The concentrations of N-ε-(1-deoxy-d-fructosyl-1-yl)-l-lysine (Fru-Lys) and N-(1-deoxy-d-fructosyl-1-yl)-l-pyroglutamic acid (Fru-pGlu) were the highest among the APs and the level of Fru-pGlu was similar to that of Fru-Lys. Furthermore, fermentation periods of up to six months greatly influenced AP levels in soy sauce but the levels remained constant thereafter. Thermal treatment of soy sauce had little effect on AP levels.
Collapse
Affiliation(s)
- Hiroshi Katayama
- Research and Development Division, Kikkoman Corporation, 399 Noda, Noda-City, Chiba 278-0037, Japan.
| | - Yuki Tatemichi
- Research and Development Division, Kikkoman Corporation, 399 Noda, Noda-City, Chiba 278-0037, Japan
| | - Ayako Nakajima
- Research and Development Division, Kikkoman Corporation, 399 Noda, Noda-City, Chiba 278-0037, Japan
| |
Collapse
|
6
|
Abstract
Peroxisomes are degraded by a selective type of autophagy known as pexophagy. Several different types of pexophagy have been reported in mammalian cells. However, the mechanisms underlying how peroxisomes are recognized by autophagy-related machinery remain elusive. PEX3 is a peroxisomal membrane protein (PMP) that functions in the import of PMPs into the peroxisomal membrane and has been shown to interact with pexophagic receptor proteins during pexophagy in yeast. Thus, PEX3 is important not only for peroxisome biogenesis, but also for peroxisome degradation. However, whether PEX3 is involved in the degradation of peroxisomes in mammalian cells is unclear. Here, we report that high levels of PEX3 expression induce pexophagy. In PEX3-loaded cells, peroxisomes are ubiquitinated, clustered, and degraded in lysosomes. Peroxisome targeting of PEX3 is essential for the initial step of this degradation pathway. The degradation of peroxisomes is inhibited by treatment with autophagy inhibitors or siRNA against NBR1, which encodes an autophagic receptor protein. These results indicate that ubiquitin- and NBR1-mediated pexophagy is induced by increased expression of PEX3 in mammalian cells. In addition, another autophagic receptor protein, SQSTM1/p62, is required only for the clustering of peroxisomes. Expression of a PEX3 mutant with substitution of all lysine and cysteine residues by arginine and alanine, respectively, also induces peroxisome ubiquitination and degradation, hence suggesting that ubiquitination of PEX3 is dispensable for pexophagy and an endogenous, unidentified peroxisomal protein is ubiquitinated on the peroxisomal membrane.
Collapse
Affiliation(s)
- Shun-ichi Yamashita
- Department of Biology; Faculty of Sciences; Kyushu University Graduate School; Fukuoka, Japan
| | - Kakeru Abe
- Graduate School of Systems Life Sciences; Kyushu University Graduate School; Fukuoka, Japan
| | - Yuki Tatemichi
- Graduate School of Systems Life Sciences; Kyushu University Graduate School; Fukuoka, Japan
| | - Yukio Fujiki
- Department of Biology; Faculty of Sciences; Kyushu University Graduate School; Fukuoka, Japan
| |
Collapse
|
7
|
Ito K, Doi K, Tatemichi Y, Shibata M. Plant regeneration of eucalypts from rotating nodule cultures. Plant Cell Rep 1996; 16:42-45. [PMID: 24178651 DOI: 10.1007/bf01275446] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/1995] [Revised: 05/06/1996] [Indexed: 06/02/2023]
Abstract
Nodule cultures were induced from shoot tips of aseptically grownEucalyptus botryoides in a vertically rotated incubator. N-(2-chloro-4-pyridyl)-N'-phenylurea (4PU) was a very effective cytokinin for induction of nodules in liquid B5 basal medium supplemented with naphthalene acetic acid and 3% sucrose.The effective concentration of 4PU ranged from 0.2 to 0.5mg/l. The nodule had a very smooth surface and was composed of small meristematic cells outside and large vacuolated cells inside. Shoots were regenerated from these cultures on media supplemented with 6-benzyladenine at 0.2mg/l in place of 4PU. These regenerated shoots were successfully rooted and cultivated in the field. Nodule cultures were maintained for 3-4 years with monthly subcultures without losing proliferation and regeneration abilities. Nodules were also successfully induced from other eucalypts, namelyE. camaldulensis, E. deglupta andE.grandis with slightly modified media. Furthermore, nodule cultures were also induced from shoot tips of field-grown plants inE.camaldulensis. This system is beneficial for both mass propagation of selected elite clones and creation of genetically engineered plants.
Collapse
Affiliation(s)
- K Ito
- Kameyama Research Center, Forestry Research Institute, New Oji Paper Co., Ltd., 24-9 Nobono-cho, Kameyama, 519-02, Mie, Japan
| | | | | | | |
Collapse
|