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- 저자 : Kiwamu Tanaka (검색결과 4 건)
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Identification of a Plant Receptor for Extracellular ATP
Choi, Jeongmin,Tanaka, Kiwamu,Cao, Yangrong,Qi, Yue,Qiu, Jing,Liang, Yan,Lee, Sang Yeol,Stacey, Gary American Association for the Advancement of Scienc 2014 Science Vol.343 No.6168
<P><B>ATP Receptor in <I>Arabidopsis</I></B></P><P>As well as its role as an intracellular energy source, extracellular adenosine triphosphate (ATP) has diverse functions as a signaling molecule. ATP receptors have been identified in animal cells, but searches based on structural homology have not identified ATP receptors in plants. <B>Choi <I>et al.</I></B> (p. 290) have now identified an ATP receptor in the model plant <I>Arabidopsis thaliana</I> by tracking down the cause of mutations that leave mutant plants unresponsive to ATP signals. The receptor identified carries an intracellular kinase domain and an extracellular lectin domain.</P>
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Yuya Yoshimitsu,Kiwamu Tanaka,Takashi Tagawa,Yasushi Nakamura,Tomoaki Matsuo,Shigehisa Okamoto 한국식물학회 2009 Journal of Plant Biology Vol.52 No.6
Tungsten particles have long been used as microcarriers in biolistic bombardment because of their cost-effectiveness compared to alternative gold particles— even if the former have several drawbacks, including their DNA-degrading activity. We characterized tungsteninduced DNA degradation to assess the value of this metal particle and to improve tungsten-based biolistic bombardment. Alkaline pH, low temperature, and high salt concentration were found to diminish tungsten-induced DNA breakdown. The pH was the most influential factor in this phenomenon, both in aqueous solutions and on the particles. Furthermore, alkaline pH greater than 9.4 of an adsorption mixture was found to be essential for DNA binding to metal particles. Based on these findings, we propose a new formula of DNA/tungsten adsorption by using TE buffers that keep alkaline pH (>9.4) of the mixture, in which tungsten-bound plasmid DNA cleavage was suppressed to half the level of that in the conventional DNA-binding condition.
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Nonlegumes Respond to Rhizobial Nod Factors by Suppressing the Innate Immune Response
Liang, Yan,Cao, Yangrong,Tanaka, Kiwamu,Thibivilliers, Sandra,Wan, Jinrong,Choi, Jeongmin,Kang, Chang ho,Qiu, Jing,Stacey, Gary American Association for the Advancement of Scienc 2013 Science Vol.341 No.6152
<P><B>Stealth Nod Factor Recognition</B></P><P>Legumes' symbiotic interaction with nitrogen fixing bacteria supplies the plant with nitrogen. Many important crop plants, however, cannot establish these symbioses and, thus, agriculture depends on externally applied fertilizers. Surprisingly, <B>Liang <I>et al.</I></B> (p. 1384, published online 5 September) found that several nonleguminous plants, including <I>Arabidopsis</I>, tomato, and corn, were able to respond to the same Nod factors that initiate the microbial symbiosis in soybean.</P>
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Extracellular ATP Acts on Jasmonate Signaling to Reinforce Plant Defense
Tripathi, Diwaker,Zhang, Tong,Koo, Abraham J.,Stacey, Gary,Tanaka, Kiwamu American Society of Plant Biologists 2018 Plant Physiology Vol.176 No.1
<P>Extracellular ATP signaling, mediated by the P2K1 receptor, directly changes the stability of JAZ1 protein in JA signaling to boost plant defense response.</P><P>Damaged cells send various signals to stimulate defense responses. Recent identification and genetic studies of the plant purinoceptor, P2K1 (also known as DORN1), have demonstrated that extracellular ATP is a signal involved in plant stress responses, including wounding, perhaps to evoke plant defense. However, it remains largely unknown how extracellular ATP induces plant defense responses. Here, we demonstrate that extracellular ATP induces plant defense mediated through activation of the intracellular signaling of jasmonate (JA), a well-characterized defense hormone. In Arabidopsis (<I>Arabidopsis thaliana</I>) leaves, ATP pretreatment induced resistance against the necrotrophic fungus, <I>Botrytis cinerea</I>. The induced resistance was enhanced in the P2K1 receptor overexpression line, but reduced in the receptor mutant, <I>dorn1</I>-<I>3</I>. Mining the transcriptome data revealed that ATP induces a set of JA-induced genes. In addition, the P2K1-associated coexpression network contains defense-related genes, including those encoding jasmonate ZIM-domain (JAZ) proteins, which play key roles as repressors of JA signaling. We examined whether extracellular ATP impacts the stability of JAZ1 in Arabidopsis. The results showed that the JAZ1 stability decreased in response to ATP addition in a proteasome-dependent manner. This reduction required intracellular signaling via second messengers—cytosolic calcium, reactive oxygen species, and nitric oxide. Interestingly, the ATP-induced JAZ1 degradation was attenuated in the JA receptor mutant, <I>coi1</I>, but not in the JA biosynthesis mutant, <I>aos</I>, or upon addition of JA biosynthesis inhibitors. Immunoprecipitation analysis demonstrated that ATP increases the interaction between COI1 and JAZ1, suggesting direct cross talk between extracellular ATP and JA in intracellular signaling events. Taken together, these results suggest that extracellular ATP signaling directly impacts the JA signaling pathway to maximize plant defense responses.</P>
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