Brigitte Gontero, Luisana Avilán,
... et al., 2011Matsumura H. Kai A. Maeda T. Tamoi M. Satoh A. Tamura H. Hirose M. Ogawa ... et al., 2011Matsumura H. Kai A. Maeda T. Tamoi M. Satoh A. Tamura H. Hirose M. Ogawa ... et al., 2011Matsumura H. Kai A. Maeda T. Tamoi M. Satoh A. Tamura H. Hirose M. Ogawa ...
Tópico(s): Mass Spectrometry Techniques and Applications
2011 - Elsevier BV | Structure
Christa Jakopitsch, Enrica Droghetti, Florian Schmuckenschlager, Paul G. Furtmüller, Giulietta Smulevich, Christian Obinger,
... 4Wada K. Tada T. Nakamura Y. Kinoshita T. Tamoi M. Shigeoka S. Nishimura K. Acta Crystallogr. Sect. ... 4Wada K. Tada T. Nakamura Y. Kinoshita T. Tamoi M. Shigeoka S. Nishimura K. Acta Crystallogr. Sect. ... 4Wada K. Tada T. Nakamura Y. Kinoshita T. Tamoi M. Shigeoka S. Nishimura K. Acta Crystallogr. Sect. ...
Tópico(s): Dye analysis and toxicity
2005 - Elsevier BV | Journal of Biological Chemistry
Masahiro Tamoi, Toru Takeda, Shigeru Shigeoka,
... of the occurrence of two FBPase isozyme genes [Tamoi et al. (1998) Biochim. Biophys. Acta 1383: 232]. ...
Tópico(s): Marine and coastal ecosystems
1999 - Oxford University Press | Plant and Cell Physiology
Kazuya Yoshimura, Yukinori Yabuta, Masahiro Tamoi, Takahiro Ishikawa, Shigeru Shigeoka,
... the C-terminus of the isoenzymes [Ishikawa, Yoshimura, Tamoi, Takeda and Shigeoka (1997) Biochem. J. 328, 795– ...
Tópico(s): Plant Stress Responses and Tolerance
1999 - Portland Press | Biochemical Journal
Kazuya Yoshimura, Yukinori Yabuta, Masahiro TAMOI, Takahiro Ishikawa, Shigeru SHIGEOKA,
... the C-terminus of the isoenzymes [Ishikawa, Yoshimura, Tamoi, Takeda and Shigeoka (1997) Biochem. J. 328, 795– ...
Tópico(s): Chromium effects and bioremediation
1999 - Portland Press | Biochemical Journal
Masahiro Tamoi, Akiko Murakami, Toru Takeda, Shigeru Shigeoka,
... the cytosolic and chloroplastic forms from eukaryotic cells [Tamoi et al., Arch. Biochem. Biophys., 334, 1996, 27– ...
Tópico(s): Marine and coastal ecosystems
1998 - Elsevier BV | Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics
Andrew Polaszek, Lucian Fusu, G. Viggiani, Andie Hall, Paul Hanson, Alexey A. Polilov,
... sp. nov.; M. rivelloi Viggiani sp. nov.; M. tamoi Polaszek, Fusu, and Viggiani sp. nov.; M. tridens ...
Tópico(s): Insect-Plant Interactions and Control
2022 - Multidisciplinary Digital Publishing Institute | Insects
Corina Joseph, Juniatí Gunawan, Nero Madi, Tamoi Janggu, Mariam Rahmat, Nafsiah Mohamed,
Corruption is one of the barriers to achieving sustainable development goals (SDGs), which is associated with the lack of integrity. The objective of the paper is to examine the extent of integrity framework information disclosure on Malaysian and Indonesian local authorities' websites using the coercive isomorphism tenet. The data collected in this study were based on a content analysis of inclusion or exclusion of integrity framework information disclosed on 51 Malaysian and 34 Indonesian local ...
Tópico(s): Public Policy and Administration Research
2019 - Elsevier BV | Journal of Cleaner Production
Noriaki Tanabe, Masahiro Noshi, Daisuke Mori, Kotaro Nozawa, Masahiro Tamoi, Shigeru Shigeoka,
Tópico(s): Plant nutrient uptake and metabolism
2018 - Springer Science+Business Media | Journal of Plant Research
Kumi Otori, Noriaki Tanabe, Masahiro Tamoi, Shigeru Shigeoka,
We previously demonstrated that alterations in sugar partitioning affect the expression of genes involved in hormone biosynthesis and responses, including BRANCHED1 (BRC1), resulting in enhanced shoot branching in transgenic Arabidopsis plants overexpressing cyanobacterial fructose-1,6-bisphosphatase-II in the cytosol (AcF). The exogenous treatment of wild-type Arabidopsis plants with sugars showed the same transcript characteristics, indicating that sugars act as a signal for branching. We also found ...
Tópico(s): Plant Stress Responses and Tolerance
2018 - Oxford University Press | Bioscience Biotechnology and Biochemistry
Kumi Otori, Masahiro Tamoi, Noriaki Tanabe, Shigeru Shigeoka,
We previously demonstrated that transgenic tobacco plants expressing cyanobacterial fructose-1,6-/sedoheptulose-1,7-bisphosphatase in the cytosol increased the number of lateral shoots and leaves at elevated CO2 levels. These findings suggest that alterations in carbon partitioning affect the development of shoot branching. In order to elucidate the underlying mechanisms at the molecular level, we generated transgenic Arabidopsis plants overexpressing cyanobacterial fructose-1,6-bisphosphatase-II ...
Tópico(s): Photosynthetic Processes and Mechanisms
2017 - Oxford University Press | Bioscience Biotechnology and Biochemistry
Hiroshi Inui, Takahiro Ishikawa, Masahiro Tamoi,
In Euglena cells under anaerobic conditions, paramylon, the storage polysaccharide, is promptly degraded and converted to wax esters. The wax esters synthesized are composed of saturated fatty acids and alcohols with chain lengths of 10–18, and the major constituents are myristic acid and myristyl alcohol. Since the anaerobic cells gain ATP through the conversion of paramylon to wax esters, the phenomenon is named “wax ester fermentation”. The wax ester fermentation is quite unique in that the end ...
Tópico(s): Biodiesel Production and Applications
2017 - Springer Nature | Advances in experimental medicine and biology
Kumi Otori, Noriaki Tanabe, Toshiki Maruyama, Shigeru Sato, Shuichi Yanagisawa, Masahiro Tamoi, Shigeru Shigeoka,
Tópico(s): Plant Stress Responses and Tolerance
2017 - Springer Science+Business Media | Journal of Plant Research
Ginga Shimakawa, Yusuke Matsuda, Kensuke Nakajima, Masahiro Tamoi, Shigeru Shigeoka, Chikahiro Miyake,
Abstract Photosynthesis produces chemical energy from photon energy in the photosynthetic electron transport and assimilates CO 2 using the chemical energy. Thus, CO 2 limitation causes an accumulation of excess energy, resulting in reactive oxygen species (ROS) which can cause oxidative damage to cells. O 2 can be used as an alternative energy sink when oxygenic phototrophs are exposed to high light. Here, we examined the responses to CO 2 limitation and O 2 dependency of two secondary algae, Euglena ...
Tópico(s): Marine and coastal ecosystems
2017 - Nature Portfolio | Scientific Reports
Daisuke Takagi, Kentaro Ifuku, Kenichi Ikeda, Kanako Inoue, Pyoyun Park, Masahiro Tamoi, H. Inoue, Katsuhiko Sakamoto, Ryota Saito, Chikahiro Miyake,
Lipid-derived reactive carbonyl species (RCS) possess electrophilic moieties and cause oxidative stress by reacting with cellular components. Arabidopsis (Arabidopsis thaliana) has a chloroplast-localized alkenal/one oxidoreductase (AtAOR) for the detoxification of lipid-derived RCS, especially α,β-unsaturated carbonyls. In this study, we aimed to evaluate the physiological importance of AtAOR and analyzed AtAOR (aor) mutants, including a transfer DNA knockout, aor (T-DNA), and RNA interference knockdown, ...
Tópico(s): Plant responses to elevated CO2
2016 - Oxford University Press | PLANT PHYSIOLOGY
Masahiro Noshi, Hiroki Yamada, Risa Hatanaka, Noriaki Tanabe, Masahiro Tamoi, Shigeru Shigeoka,
Ascorbate and glutathione are indispensable cellular redox buffers and allow plants to acclimate stressful conditions. Arabidopsis contains three functional dehydroascorbate reductases (DHAR1-3), which catalyzes the conversion of dehydroascorbate into its reduced form using glutathione as a reductant. We herein attempted to elucidate the physiological role in DHAR1 and DHAR2 in stress responses. The total DHAR activities in DHAR knockout Arabidopsis plants, dhar1 and dhar2, were 22 and 92%, respectively, ...
Tópico(s): Genomics, phytochemicals, and oxidative stress
2016 - Oxford University Press | Bioscience Biotechnology and Biochemistry
Masahiro Tamoi, Shigeru Shigeoka,
To clarify the regulatory mechanisms of the Calvin cycle in algae, we analyzed the molecular properties of the enzymes involved in this cycle. We demonstrated that these enzymes were not regulated by redox modulation through the ferredoxin/thioredoxin system under light/dark conditions and were not sensitive to treatments with hydrogen peroxide in vitro, unlike the chloroplastic thiol-modulated enzymes of plants. On the other hand, we found that cyanobacteria possessed a unique enzyme involved in ...
Tópico(s): Light effects on plants
2015 - Oxford University Press | Bioscience Biotechnology and Biochemistry
Hiroyuki Tanaka, Takanori Maruta, Takahisa Ogawa, Noriaki Tanabe, Masahiro Tamoi, Kazuya Yoshimura, Shigeru Shigeoka,
GDP-d-mannose (GDP-d-Man) is an important intermediate in ascorbic acid (AsA) synthesis, cell wall synthesis, protein N-glycosylation, and glycosylphosphatidylinositol-anchoring in plants. Thus, the modulation of intracellular levels of GDP-d-Man could be important for maintaining various cellular processes. Here an Arabidopsis GDP-d-Man pyrophosphohydrolase, AtNUDX9 (AtNUDT9; At3g46200), which hydrolysed GDP-d-Man to GMP and mannose 1-phosphate, was identified. The Km and Vmax values for GDP-d-Man ...
Tópico(s): Plant Micronutrient Interactions and Effects
2015 - Oxford University Press | Journal of Experimental Botany
Takahisa Ogawa, Masahiro Tamoi, Ayako Kimura, Ayaka Mine, Harumi Sakuyama, Eriko Yoshida, Takanori Maruta, Kengo Suzuki, Takahiro Ishikawa, Shigeru Shigeoka,
Microalgae have recently been attracting attention as a potential platform for the production of biofuels. Euglena gracilis, a unicellular phytoflagellate, has been proposed as an attractive feedstock to produce biodiesel because it can produce large amounts of wax esters, consisting of medium-chain fatty acids and alcohols with 14:0 carbon chains. E. gracilis cells highly accumulate a storage polysaccharide, a β-1,3-glucan known as paramylon, under aerobic conditions. When grown aerobically and ...
Tópico(s): Aquatic Ecosystems and Phytoplankton Dynamics
2015 - Springer Science+Business Media | Biotechnology for Biofuels
Hiroyuki Tanaka, Yukinori Yabuta, Masahiro Tamoi, Noriaki Tanabe, Shigeru Shigeoka,
Tocotrienols with three double bonds in the hydrocarbon tail are the major form of vitamin E in the seeds of most monocots and certain dicots. They have recently been attracting increasing attention for their various biological properties for human health. Homogentisate geranylgeranyl transferase (HGGT) catalyzes the committed step of tocotrienol biosynthesis. HGGT, except for enzyme from barley, has been not analyzed in detail, although cDNAs encoding HGGT have been isolated from barley, wheat, ...
Tópico(s): Plant biochemistry and biosynthesis
2015 - Japanese Society for Plant Biotechnology | Plant Biotechnology
Noriaki Tanabe, Masahiro Tamoi, Shigeru Shigeoka,
Sweet potato is an important crop because of its high yield and biomass production. We herein investigated the potential of the promoter activity of a small subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase (RbcS) from sweet potato (Ipomoea batatas) in order to develop the high expression system of exogenous DNA in Arabidopsis. We isolated two different cDNAs (IbRbcS1 and IbRbcS2) encoding RbcS from sweet potato. Their predicted amino acid sequences were well conserved with the mature RbcS ...
Tópico(s): Plant Molecular Biology Research
2015 - Elsevier BV | Gene
Ryosuke Hayashi, Ginga Shimakawa, Keiichiro Shaku, Satoko Shimizu, Seiji Akimoto, Hiroshi Yamamoto, Katsumi Amako, Toshio Sugimoto, Masahiro Tamoi, Amane Makino, Chikahiro Miyake,
To determine whether alternative electron flow (AEF) can replace the photosynthetic electron flow in cyanobacteria, we used an open O2-electrode system to monitor O2-exchange over a long period. In air-grown Synechocystis sp. PCC 6803 (S. 6803(WT)), the quantum yield of PSII, Y(II), held even after photosynthesis was suppressed by CO2 shortage. The S. 6803 mutant, deficient in flavodiiron (FLV) proteins 1 and 3, showed the same phenotype as S. 6803(WT). In contrast, Y(II) decreased in Synechococcus ...
Tópico(s): Photoreceptor and optogenetics research
2014 - Oxford University Press | Bioscience Biotechnology and Biochemistry
Tamoi Janggu, Faizah Darus, Mustaffa Mohamed Zain, Yussri Sawani,
This paper examines the impact of good corporate governance (CG) on the sustainability disclosure of 100 public listed companies in Malaysia from the perspective of agency theory. The data was analysed using Structural Equation Modelling technique of Partial Least Squares. The findings from the study indicate that board size, professionalism and board designation had a significant impact on sustainability disclosure. However, board independence and board ownership were not significant in motivating ...
Tópico(s): Corporate Finance and Governance
2014 - Elsevier BV | Procedia - Social and Behavioral Sciences
Saori Kamachi, Kei Hirabayashi, Masahiro Tamoi, Shigeru Shigeoka, Toshiji Tada, Kei Wada,
Isoniazid (INH) is one of the most effective antibiotics against tuberculosis. INH is a prodrug that is activated by KatG. Although extensive studies have been performed in order to understand the mechanism of KatG, even the binding site of INH in KatG remains controversial. In this study, we determined the crystal structure of KatG from Synechococcus elongatus PCC7942 (SeKatG) in a complex with INH at 2.12-Å resolution. Three INH molecules were bound to the molecular surface. One INH molecule was ...
Tópico(s): Porphyrin Metabolism and Disorders
2014 - Wiley | FEBS Journal
Takanori Maruta, Masahiro Noshi, Maki Nakamura, Shun Matsuda, Masahiro Tamoi, Takahiro Ishikawa, Shigeru Shigeoka,
Anthocyanins are important for preventing photoinhibition and photodamage. By comprehensive reverse genetic analysis of chloroplast-produced H2O2-responsive genes, we isolated here an anthocyanin-deficient mutant under photooxidative stress, which lacked ferulate 5-hydroxylase 1 (FAH1) involved in the phenylpropanoid pathway. Interestingly, the expression of anthocyanin biosynthesis-associated genes was also inhibited in this mutant. These findings suggest that FAH1 is essential for expression of ...
Tópico(s): Plant Stress Responses and Tolerance
2014 - Elsevier BV | Plant Science
Faizah Darus, Yussri Sawani, Mustaffa Mohamed Zain, Tamoi Janggu,
Purpose – This study explores the factors that impede the growth of the voluntary adoption of independent corporate social responsibilities assurance (CSRA) practices among manufacturing companies in Malaysia. Despite the argument that independent CSRA appraisals would improve the credibility of information disclosed, the majority of CSR reports in Malaysia are still not independently assured. The aim of this study is to understand the factors that impede CSRA practices among public-listed manufacturing ...
Tópico(s): Ethics in Business and Education
2014 - Emerald Publishing Limited | Managerial Auditing Journal
Corina Joseph, Esmie Obrin Nichol, Tamoi Janggu, Nero Madi,
Purpose The purpose of this paper is to examine the level of environmental literacy among business lecturers in Malaysia. Design/methodology/approach A survey, which involved a combination of newly developed items and items adopted from past studies, was used to collect data from 35 respondents (out of 70). Findings The overall mean score for environmental literacy is 3.22 (out of 5), indicating that the respondents' level of literacy is slightly more than just fair knowledge. The most widely understood ...
Tópico(s): Environmental Sustainability in Business
2013 - Emerald Publishing Limited | International Journal of Sustainability in Higher Education
Takanori Maruta, Tadashi Yoshimoto, Daisuke Ito, Takahisa Ogawa, Masahiro Tamoi, Kazuya Yoshimura, Shigeru Shigeoka,
Although flavins, riboflavin (RF), FMN and FAD, are essential for primary and secondary metabolism in plants, the metabolic regulation of flavins is still largely unknown. Recently, we found that an Arabidopsis Nudix hydrolase, AtNUDX23, has FAD pyrophosphohydrolase activity and is distributed in plastids. Levels of RF and FAD but not FMN in Arabidopsis leaves significantly increased under continuous light and decreased in the dark. The transcript levels of AtNUDX23 as well as genes involved in flavin ...
Tópico(s): Electrochemical sensors and biosensors
2012 - Oxford University Press | Plant and Cell Physiology
Takanori Maruta, Masahiro Noshi, Aoi Tanouchi, Masahiro Tamoi, Yukinori Yabuta, Kazuya Yoshimura, Takahiro Ishikawa, Shigeru Shigeoka,
Recent findings have suggested that reactive oxygen species (ROS) are important signaling molecules for regulating plant responses to abiotic and biotic stress and that there exist source- and kind-specific pathways for ROS signaling. In plant cells, a major source of ROS is chloroplasts, in which thylakoid membrane-bound ascorbate peroxidase (tAPX) plays a role in the regulation of H2O2 levels. Here, to clarify the signaling function of H2O2 derived from the chloroplast, we created a conditional ...
Tópico(s): Plant responses to elevated CO2
2012 - Elsevier BV | Journal of Biological Chemistry
Ahmed Gaber, Tomoya Ogata, Takanori Maruta, Kazuya Yoshimura, Masahiro Tamoi, Shigeru Shigeoka,
A family of eight genes with homology to mammalian glutathione peroxidase (GPX) isoenzymes, designated AtGPX1–AtGPX8, has been identified in Arabidopsis thaliana. In this study we demonstrated the functional analysis of Arabidopsis AtGPX8 with peroxidase activity toward H2O2 and lipid hydroperoxides using thioredoxin as an electron donor. The transcript and protein levels of AtGPX8 in Arabidopsis were up-regulated coordinately in response to oxidative damage caused by high-light (HL) stress or treatment ...
Tópico(s): Glutathione Transferases and Polymorphisms
2012 - Oxford University Press | Plant and Cell Physiology