Papers - SAKAMOTO Hikaru
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Correction: Islam, S., et al. Impaired Expression of Chloroplast HSP90C Chaperone Activates Plant Defense Responses with a Possible Link to a Disease-Symptom-Like Phenotype. Reviewed
Shaikhul Islam, Sachin Ashok Bhor, Keisuke Tanaka, Hikaru Sakamoto, Takashi Yaeno, Hidetaka Kaya, Kappei Kobayashi
International Journal of Molecular Science 21 ( 22 ) 8461 2020.11
Language：English Publishing type：Research paper (scientific journal)
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Transcriptome Analysis Shows Activation of Stress and Defense Responses by Silencing of Chlorophyll Biosynthetic Enzyme CHLI in Transgenic Tobacco
Shaikhul Islam, Sachin Ashok Bhor, Keisuke Tanaka, Hikaru Sakamoto, Takashi Yaeno, Hidetaka Kaya, Kappei Kobayashi
International Journal of Molecular Science 21 ( 19 ) 7044 2020.09
Language：English Publishing type：Research paper (scientific journal)
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Impaired Expression of Chloroplast HSP90C Chaperone Activates Plant Defense Responses with a Possible Link to a Disease-Symptom-Like Phenotype Reviewed
Shaikhul Islam, Sachin Ashok Bhor, Keisuke Tanaka, Hikaru Sakamoto, Takashi Yaeno, Hidetaka Kaya, Kappei Kobayashi
Int J Mol Sci. 21 ( 12 ) 4202 2020.01
Language：English Publishing type：Research paper (scientific journal)
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Comparative Analysis of Bacterial Diversity and Community Structure in the Rhizosphere and Root Endosphere of Two Halophytes, Salicornia europaea and Glaux maritima, Collected from Two Brackish Lakes in Japan Reviewed
Kosuke Yamamoto, Minenosuke Matsutani, Yuh Shiwa, Taichiro Ishige, Hikaru Sakamoto, Hiromasa Saitoh, Seiya Tsushima
Microbes Environ. 35 ( 3 ) 2020
Language：English Publishing type：Research paper (scientific journal)
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Bacterial Diversity Associated With the Rhizosphere and Endosphere of Two Halophytes: Glaux maritima and Salicornia europaea Reviewed
Kosuke Yamamoto, Yuh Shiwa, Taichiro Ishige, Hikaru Sakamoto, Keisuke Tanaka, Masataka Uchino, Naoto Tanaka, Suguru Oguri, Hiromasa Saitoh and Seiya Tsushima
Frontiers in Microbiology 9 2878 2018.11
Language：English Publishing type：Research paper (scientific journal)
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Compositional changes of the floral scent volatile emissions from Asian skunk cabbage (Symplocarpus renifolius, Araceae) over flowering sex phases. Reviewed
Oguri S., Sakamaki K., Sakamoto H., Kubota K.
Phytochem. Anal. ePub 2018.10
Language：English Publishing type：Research paper (scientific journal)
DOI： 10.1002/pca.2799.
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Altered expression of acetylcholinesterase gene in rice results in enhancement or suppression of shoot gravitropism. Reviewed
Yamamoto, K., Sakamoto, H., Momonoki, Y.S.
Plant Signal. Behav. 11 ( e1163464 ) 2016.03
Language：English Publishing type：Research paper (scientific journal)
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Yeast functional screen to identify genes conferring salt stress tolerance in Salicornia europaea (共著) Invited Reviewed
Yoshiki Nakahara, Shogo Sawabe, Kenta Kainuma, Maki Katsuhara, Mineo Shibasaka, Masanori Suzuki, Kosuke Yamamoto, Suguru Oguri, Hikaru Sakamoto
Frontiers in Plant Science 6 920 2015.10
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
Salinity is a critical environmental factor that adversely affects crop productivity. Halophytes have evolved various mechanisms to adapt to saline environments. Salicornia europaea L. is one of the most salt-tolerant plant species. It does not have special salt-secreting structures like a salt gland or salt bladder, and is therefore a good model for studying the common mechanisms underlying plant salt tolerance. To identify candidate genes encoding key proteins in the mediation of salt tolerance in S. europaea, we performed a functional screen of a cDNA library in yeast. The library was screened for genes that allowed the yeast to grow in the presence of 1.3 M NaCl. We obtained three full-length S. europaea genes that confer salt tolerance. The genes are predicted to encode (1) a novel protein highly homologous to thaumatin-like proteins, (2) a novel coiled-coil protein of unknown function, and (3) a novel short peptide of 32 residues. Exogenous application of a synthetic peptide corresponding to the 32 residues improved salt tolerance of Arabidopsis. The approach described in this report provides a rapid assay system for large-scale screening of S. europaea genes involved in salt stress tolerance and supports the identification of genes responsible for such mechanisms. These genes may be useful candidates for improving crop salt tolerance by genetic transformation.
Other Link： http://journal.frontiersin.org/article/10.3389/fpls.2015.00920/full
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Overexpression of acetylcholinesterase gene in rice results in enhancement of shoot gravitropism. Reviewed
Kosuke Yamamoto, Satoshi Shida, Yoshihiro Honda, Mariko Shono, Hiroshi Miyake, Suguru Oguri, Hikaru Sakamoto, Yoshie S. Momonoki
Biochemical and Biophysical Research Communications 465 ( 3 ) 488 - 493 2015.09
Language：English Publishing type：Research paper (scientific journal)
Acetylcholine (ACh), a known neurotransmitter in animals and acetylcholinesterase (AChE) exists widely in plants, although its role in plant signal transduction is unclear. We previously reported AChE in Zea mays L. might be related to gravitropism based on pharmacological study using an AChE inhibitor. Here we clearly demonstrate plant AChE play an important role as a positive regulator in the gravity response of plants based on a genetic study. First, the gene encoding a second component of the ACh-mediated signal transduction system, AChE was cloned from rice, Oryza sativa L. ssp. Japonica cv. Nipponbare. The rice AChE shared high homology with maize, siratro and Salicornia AChEs. Similar to animal and other plant AChEs, the rice AChE hydrolyzed acetylthiocholine and propionylthiocholine, but not butyrylthiocholine. Thus, the rice AChE might be characterized as an AChE (E.C.3.1.1.7). Similar to maize and siratro AChEs, the rice AChE exhibited low sensitivity to the AChE inhibitor, neostigmine bromide, compared with the electric eel AChE. Next, the functionality of rice AChE was proved by overexpression in rice plants. The rice AChE was localized in extracellular spaces of rice plants. Further, the rice AChE mRNA and its activity were mainly detected during early developmental stages (2 d–10 d after sowing). Finally, by comparing AChE up-regulated plants with wild-type, we found that AChE overexpression causes an enhanced gravitropic response. This result clearly suggests that the function of the rice AChE relate to positive regulation of gravitropic response in rice seedlings.
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Datura stramonium agglutinin: Cloning, molecular characterization and recombinant production in Arabidopsis thaliana. Reviewed
Nishimoto, K., Tanaka, K., Murakami, T., Nakashita, H., Sakamoto, H., Oguri, S.
Glycobiology 25 ( 2 ) 157 - 169 2015.02
Language：English Publishing type：Research paper (scientific journal)
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Alternative Splicing of an Arabidopsis Gene, At2g24600, Encoding Ankyrin-Repeat Protein. Reviewed
Sakamoto, H., Kurosawa, S., Suzuki, M., and Oguri, S.
Proceedings of World Academy of Science, Engineering and Technology 87 407 - 409 2014.03
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
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A Novel Gene Encoding Ankyrin-Repeat Protein, SHG1, is Indispensable for Seed Germination under Moderate Salt Stress. Reviewed
Sakamoto, H., Tochimoto, J., Kurosawa, S., Suzuki, M., and Oguri, S.
Proceedings of World Academy of Science, Engineering and Technology 87 688 - 691 2014.03
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
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The Expression of a Novel Gene Encoding an Ankyrin-Repeat Protein, DRA1, is Regulated by Drought-Responsive Alternative Splicing Reviewed
H. Sakamoto, Y. Nakagawara, S. Oguri
International Journal of Biological, Life Science and Engineering 7 ( 12 ) 396 - 400 2013
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
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Interaction between a plasma membrane-localized ankyrin-repeat protein ITN1 and a nuclear protein RTV1 Reviewed
Hikaru Sakamoto, Keiko Sakata, Kensuke Kusumi, Mikiko Kojima, Hitoshi Sakakibara, Koh Iba
Biochemical and Biophysical Research Communications 423 ( 2 ) 392 - 397 2012.06
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
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Purification, characterization, and molecular cloning of lectin from winter buds of Lysichiton camtschatcensis (L.) Schott. Reviewed
Yuichiro NAKAGAWA, Hikaru SAKAMOTO, Hiroaki TATENO, Jun HIRABAYASHI, Suguru OGURI
Bioscience, Biotechnology, and Biochemistry 76 ( 1 ) 25 - 33 2012
Language：English Publishing type：Research paper (scientific journal)
DOI： 10.1271/bbb.110346
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Maize acetylcholinesterase is a positive regulator of heat tolerance in plants Reviewed
Kosuke Yamamoto, Hikaru Sakamoto, Yoshie S. Momonoki
Journal of Plant Physiology 168 ( 16 ) 1987 - 1992 2011
Language：English Publishing type：Research paper (scientific journal)
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CTD phosphatases in the attenuation of wound-induced transcription of jasmonic acid biosynthetic genes in Arabidopsis
Matsuda, O., Nakao, Y., Oda, K., Iba, K.、坂本 光
Plant J., 57 (1) pp.96~108 2009.01
Language：English Publishing type：Research paper (scientific journal)
ジャスモン酸は、植物の傷害応答を担うホルモンである。ジャスモン酸の前駆体を生成する酵素をコードするFAD7の発現は傷害によって誘導される。我々は、FAD7プロモーター活性を指標として、シロイヌナズナの傷害高感受性変異体を単離した。この株はCTDホスファターゼをコードするCPL1に変異を持つ。CPL1は、FAD7を介した傷害応答的ジャスモン酸生成のブレーキとして機能すると考えられる。
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ITN1, a novel gene encoding an ankyrin-repeat protein that affects the ABA-mediated production of reactive oxygen species and is involved in salt-stress tolerance in Arabidopsis thaliana
Matsuda, O., Iba, K.、坂本 光
Plant J., 56 (3) pp.411～422 2008.11
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
塩ストレスに応じて植物は活性酸素(ROS)を生成するが、その過剰な蓄積は植物を枯死させる。我々が単離したシロイヌナズナの耐塩性変異体itn1は、機能未知のアンキリンリピートタンパク質を欠損している。この変異体では、塩ストレスに応じたROS生成系遺伝子の発現およびROSの蓄積が野生株より低下していた。ITN1はROS生成に関与するシグナル経路の制御因子であると考えられる。
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ITN1, a novel gene encoding an ankyrin-repeat protein that affects the ABA-mediated production of reactive oxygen species and is involved in salt stress tolerance in Arabidopsis thaliana
Hikaru Sakamoto
九州大学大学院理学府生物科学専攻 2008.10
Authorship：Lead author Language：English Publishing type：Doctoral thesis
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植物のストレス適応におけるトリエン脂肪酸の役割と代謝制御
松田 修、射場 厚、坂本 光
化学と生物 44巻5号 pp.331～337 2006.05
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
植物の生体膜に含まれるトリエン脂肪酸(TA)は、温度、傷害、病原菌などの様々な環境ストレスに応答してその含量が変動するため、植物のストレス適応に不可欠な役割を果たすものと推察される。植物のストレス適応におけるTAの生理的役割と、その生合成酵素であるFAD3、FAD7、FAD8を介した代謝制御の分子的実態について、これまでに得られている知見を概説する。