Search results for: Yoshitaka Nishiyama

Items from 1 to 20 out of 39 results

article

Improved capacity for the repair of photosystem II via reinforcement of the translational and antioxidation systems in Synechocystis sp. PCC 6803

Pornpan Napaumpaiporn, Takako Ogawa, Kintake Sonoike, Yoshitaka Nishiyama

The Plant Journal > 117 > 4 > 1165 - 1178

In the cyanobacterium Synechocystis sp. PCC 6803, translation factor EF‐Tu is inactivated by reactive oxygen species (ROS) via oxidation of Cys82 and the oxidation of EF‐Tu enhances the inhibition of the repair of photosystem II (PSII) by suppressing protein synthesis. In our present study, we generated transformants of Synechocystis that overexpressed a mutated form of EF‐Tu, designated EF‐Tu (C82S),...

article

The efficacy and feasibility of dose-dense sequential chemotherapy for Japanese patients with breast cancer

Daisuke Takabatake, Yukiko Kajiwara, Shoichiro Ohtani, Yoko Itano, more

Breast Cancer > 2018 > 25 > 6 > 717-722

Background Perioperative dose-dense chemotherapy (DDCT) with granulocyte-colony stimulating factor (G-CSF) prophylaxis is a standard treatment for patients with high-risk breast cancer. The approval of this approach in Japan led to the widespread adoption of DDCT, despite limited efficacy and safety data among Japanese patients. We evaluated the efficacy and safety of neoadjuvant DDCT for Japanese...

article

ATP is a driving force in the repair of photosystem II during photoinhibition

Norio Murata, Yoshitaka Nishiyama

Plant, Cell & Environment > 41 > 2 > 285 - 299

Repair of photosystem II (PSII) during photoinhibition involves replacement of photodamaged D1 protein by newly synthesized D1 protein. In this review, we summarize evidence for the indispensability of ATP in the degradation and synthesis of D1 during the repair of PSII. Synthesis of one molecule of the D1 protein consumes more than 1,300 molecules of ATP equivalents. The degradation of photodamaged...

article

The LexA transcription factor regulates fatty acid biosynthetic genes in the cyanobacterium Synechocystis sp. PCC 6803

Ayumi Kizawa, Akihito Kawahara, Kosuke Takashima, Yasushi Takimura, more

The Plant Journal > 92 > 2 > 189 - 198

Specific transcription factors have been identified in various heterotrophic bacterial species that regulate the sets of genes required for fatty acid metabolism. Here, we report that expression of the fab genes, encoding fatty acid biosynthetic enzymes, is regulated by the global regulator LexA in the photoautotrophic cyanobacterium Synechocystis sp. PCC 6803. Sll1626, an ortholog of the well‐known...

article

Disturbance of cell-size determination by forced overproduction of sulfoquinovosyl diacylglycerol in the cyanobacterium Synechococcus elongatus PCC 7942

Norihiro Sato, Yuki Ebiya, Ryutaro Kobayashi, Yoshitaka Nishiyama, more

Biochemical and Biophysical Research Communications > 2017 > 487 > 3 > 734-739

Sulfoquinovosyl diacylglycerol (SQDG) is present in the membranes of cyanobacteria or their descendants, plastids at species-dependent levels. We investigated the physiological significance of the intrinsic SQDG content in the cyanobacterium Synechococcus elongatus PCC 7942, with the use of its mutant, in which the genes for SQDG synthesis, sqdB and sqdX, were overexpressed. The mutant showed a 1...

article

Light spectrum regulates cell accumulation during daytime in the raphidophyte Chattonella antiqua causing noxious red tides

Tomoyuki Shikata, Shigeru Matsunaga, Yusuke Kuwahara, Sho Iwahori, more

Journal of Photochemistry and Photobiology B: Biology > 2016 > 160 > C > 128-133

Most marine raphidophyte species cause noxious red tides in temperate coastal areas around the world. It is known that swimming abilities enable raphidophytes to accumulation of cells and to actively acquire light at surface layers and nutrients over a wide depth range. However, it remains unclear how the swimming behavior is affected by environmental conditions, especially light condition. In the...

article

Investigation of segregation during oxidation of Ni–Cu alloy by in situ photoelectron spectroscopy

Takashi Doi, Yoshitaka Nishiyama, Akitaka Yoshigoe, Yuden Teraoka

Surface and Interface Analysis > 48 > 7 > 685 - 688

Ni‐based alloys has been widely used for plant application because of their high strength and excellent oxidation resistance. In particularl, the addition of Cu in Ni‐based alloys significantly improves the metal dusting resistance. It is indicated that Cu is segregated on the alloy surface in the metal dusting environment; however, the details have not been clarified yet. The behavior of Ni–2Cu alloy...

article

Analysis of spontaneous suppressor mutants from the photomixotrophically grown pmgA-disrupted mutant in the cyanobacterium Synechocystis sp. PCC 6803

Yoshiki Nishijima, Yu Kanesaki, Hirofumi Yoshikawa, Takako Ogawa, more

Photosynthesis Research > 2015 > 126 > 2-3 > 465-475

The pmgA-disrupted (ΔpmgA) mutant in the cyanobacterium Synechocystis sp. PCC 6803 suffers severe growth inhibition under photomixotrophic conditions. In order to elucidate the key factors enabling the cells to grow under photomixotrophic conditions, we isolated spontaneous suppressor mutants from the ΔpmgA mutant derived from a single colony. When the ΔpmgA mutant was spread on a BG11 agar plate...

article

Clinical features of spontaneous coronary artery dissection

Michiaki Tokura, Isao Taguchi, Michiya Kageyama, Takahisa Nasuno, more

Journal of Cardiology > 2014 > 63 > 2 > 119-122

Spontaneous coronary artery dissection (SCAD) is an infrequent but increasingly recognized cause of acute coronary syndrome (ACS). Previous case reports demonstrated that this condition occurs in young females with a low atherosclerotic risk factor burden and may be associated with peripartum or postpartum status. The purpose of this study was to review patients with angiographically confirmed SCAD...

article

Revised scheme for the mechanism of photoinhibition and its application to enhance the abiotic stress tolerance of the photosynthetic machinery

Yoshitaka Nishiyama, Norio Murata

Applied Microbiology and Biotechnology > 2014 > 98 > 21 > 8777-8796

When photosynthetic organisms are exposed to abiotic stress, their photosynthetic activity is significantly depressed. In particular, photosystem II (PSII) in the photosynthetic machinery is readily inactivated under strong light and this phenomenon is referred to as photoinhibition of PSII. Other types of abiotic stress act synergistically with light stress to accelerate photoinhibition. Recent studies...

article

Expression of a highly active catalase VktA in the cyanobacterium Synechococcus elongatus PCC 7942 alleviates the photoinhibition of photosystem II

Haruhiko Jimbo, Akiko Noda, Hidenori Hayashi, Takanori Nagano, more

Photosynthesis Research > 2013 > 117 > 1-3 > 509-515

The repair of photosystem II (PSII) after photodamage is particularly sensitive to reactive oxygen species—such as H₂O₂, which is abundantly produced during the photoinhibition of PSII. In the present study, we generated a transformant of the cyanobacterium Synechococcus elongatus PCC 7942 that expressed a highly active catalase, VktA, which is derived from a facultatively psychrophilic bacterium...

article

The mechanism of photoinhibition in vivo: Re-evaluation of the roles of catalase, α-tocopherol, non-photochemical quenching, and electron transport

Norio Murata, Suleyman I. Allakhverdiev, Yoshitaka Nishiyama

BBA - Bioenergetics > 2012 > 1817 > 8 > 1127-1133

Photoinhibition of photosystem II (PSII) occurs when the rate of light-induced inactivation (photodamage) of PSII exceeds the rate of repair of the photodamaged PSII. For the quantitative analysis of the mechanism of photoinhibition of PSII, it is essential to monitor the rate of photodamage and the rate of repair separately and, also, to examine the respective effects of various perturbations on...

article

A change in the sensitivity of elongation factor G to oxidation protects photosystem II from photoinhibition in Synechocystis sp. PCC 6803

Kayoko Ejima, Tomoko Kawaharada, Shuhei Inoue, Kouji Kojima, more

FEBS Letters > 2012 > 586 > 6 > 778-783

The repair of photosystem II (PSII) after photodamage is particularly sensitive to oxidative stress and inhibition of such repair is associated with the oxidation of specific cysteine residues in elongation factor G (EF-G), a key translation factor, in the cyanobacterium Synechocystis sp. PCC 6803. Expression of mutated EF-G with a target cysteine residue replaced by serine in Synechocystis resulted...

article

In situ X-ray diffraction of surface oxide on type 430 stainless steel in breakaway condition using synchrotron radiation

Isao Saeki, Yusuke Sugiyama, Shigenari Hayashi, Akira Yamauchi, more

Corrosion Science > 2012 > 55 > Complete > 219-225

Changes in the crystal structure of type 430 stainless steel and the oxides on its surface were studied in situ at 1373K using a high-intensity synchrotron X-ray source provided by SPring-8 in Japan. The surface of the steel was initially covered with Cr ₂ O ₃ , which was then converted to FeCr ₂ O ₄ , and finally Fe ₃ O ₄ and Fe ₂ O ₃ ...

article

Protein synthesis is the primary target of reactive oxygen species in the photoinhibition of photosystem II

Yoshitaka Nishiyama, Suleyman I. Allakhverdiev, Norio Murata

Physiologia Plantarum > 142 > 1 > 35 - 46

Photoinhibition of photosystem II (PSII) occurs when the rate of photodamage to PSII exceeds the rate of the repair of photodamaged PSII. Recent examination of photoinhibition by separate determinations of photodamage and repair has revealed that the rate of photodamage to PSII is directly proportional to the intensity of incident light and that the repair of PSII is particularly sensitive to the...

article

Protection by α-tocopherol of the repair of photosystem II during photoinhibition in Synechocystis sp. PCC 6803

Shuhei Inoue, Kayoko Ejima, Eri Iwai, Hidenori Hayashi, more

BBA - Bioenergetics > 2011 > 1807 > 2 > 236-241

α-Tocopherol is a lipophilic antioxidant that is an efficient scavenger of singlet oxygen. We investigated the role of α-tocopherol in the protection of photosystem II (PSII) from photoinhibition using a mutant of the cyanobacterium Synechocystis sp. PCC 6803 that is deficient in the biosynthesis of α-tocopherol. The activity of PSII in mutant cells was more sensitive to inactivation by strong light...

article

Synthesis of fatty acids de novo is required for photosynthetic acclimation of Synechocystis sp. PCC 6803 to high temperature

Yohei Nanjo, Naoki Mizusawa, Hajime Wada, Antoni R. Slabas, more

BBA - Bioenergetics > 2010 > 1797 > 8 > 1483-1490

The role of fatty acid synthesis in the acclimation of the photosynthetic machinery to high temperature was investigated in a mutant of the cyanobacterium Synechocystis sp. PCC 6803 that had a lower than wild-type level of enoyl-(acyl-carrier-protein) reductase FabI, a key component of the type-II fatty acid synthase system. The mutant exhibited marked impairment in the tolerance and acclimation of...

article

Differential proteomic analysis using iTRAQ reveals changes in thylakoids associated with Photosystem II‐acquired thermotolerance in Synechocystis sp. PCC 6803

John G. Rowland, William J. Simon, Yoshitaka Nishiyama, Antoni R. Slabas

PROTEOMICS > 10 > 10 > 1917 - 1929

Growth temperature has a marked influence on the thermotolerance of photosystem II (PSII), which is the most heat‐sensitive component of photosynthesis. Using Synechocystis sp. PCC 6803 we have established that thylakoids isolated from cells grown at 38°C have a greater degree of thermotolerance than those isolated from cells grown at 25°C. Reconstitution experiments using Triton X‐100 protein extracts...

article

Glycinebetaine alleviates the inhibitory effect of moderate heat stress on the repair of photosystem II during photoinhibition

Suleyman I. Allakhverdiev, Dmitry A. Los, Prasanna Mohanty, Yoshitaka Nishiyama, more

BBA - Bioenergetics > 2007 > 1767 > 12 > 1363-1371

Transformation with the bacterial gene codA for choline oxidase allows Synechococcus sp. PCC 7942 cells to accumulate glycinebetaine when choline is supplemented exogenously. First, we observed two types of protective effect of glycinebetaine against heat-induced inactivation of photosystem II (PSII) in darkness; the codA transgene shifted the temperature range of inactivation of the oxygen-evolving...

article

Photoinhibition of photosystem II under environmental stress

Norio Murata, Shunichi Takahashi, Yoshitaka Nishiyama, Suleyman I. Allakhverdiev

BBA - Bioenergetics > 2007 > 1767 > 6 > 414-421

Inhibition of the activity of photosystem II (PSII) under strong light is referred to as photoinhibition. This phenomenon is due to an imbalance between the rate of photodamage to PSII and the rate of the repair of damaged PSII. In the “classical” scheme for the mechanism of photoinhibition, strong light induces the production of reactive oxygen species (ROS), which directly inactivate the photochemical...

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INFONA - science communication portal

Search results for: Yoshitaka Nishiyama

Improved capacity for the repair of photosystem II via reinforcement of the translational and antioxidation systems in Synechocystis sp. PCC 6803

The efficacy and feasibility of dose-dense sequential chemotherapy for Japanese patients with breast cancer

ATP is a driving force in the repair of photosystem II during photoinhibition

The LexA transcription factor regulates fatty acid biosynthetic genes in the cyanobacterium Synechocystis sp. PCC 6803

Disturbance of cell-size determination by forced overproduction of sulfoquinovosyl diacylglycerol in the cyanobacterium Synechococcus elongatus PCC 7942

Light spectrum regulates cell accumulation during daytime in the raphidophyte Chattonella antiqua causing noxious red tides

Investigation of segregation during oxidation of Ni–Cu alloy by in situ photoelectron spectroscopy

Analysis of spontaneous suppressor mutants from the photomixotrophically grown pmgA-disrupted mutant in the cyanobacterium Synechocystis sp. PCC 6803

Clinical features of spontaneous coronary artery dissection

Revised scheme for the mechanism of photoinhibition and its application to enhance the abiotic stress tolerance of the photosynthetic machinery

Expression of a highly active catalase VktA in the cyanobacterium Synechococcus elongatus PCC 7942 alleviates the photoinhibition of photosystem II

The mechanism of photoinhibition in vivo: Re-evaluation of the roles of catalase, α-tocopherol, non-photochemical quenching, and electron transport

A change in the sensitivity of elongation factor G to oxidation protects photosystem II from photoinhibition in Synechocystis sp. PCC 6803

In situ X-ray diffraction of surface oxide on type 430 stainless steel in breakaway condition using synchrotron radiation

Protein synthesis is the primary target of reactive oxygen species in the photoinhibition of photosystem II

Protection by α-tocopherol of the repair of photosystem II during photoinhibition in Synechocystis sp. PCC 6803

Synthesis of fatty acids de novo is required for photosynthetic acclimation of Synechocystis sp. PCC 6803 to high temperature

Differential proteomic analysis using iTRAQ reveals changes in thylakoids associated with Photosystem II‐acquired thermotolerance in Synechocystis sp. PCC 6803

Glycinebetaine alleviates the inhibitory effect of moderate heat stress on the repair of photosystem II during photoinhibition

Photoinhibition of photosystem II under environmental stress

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