Effect of hydroxyl radical on intact microalgal photosynthesis

Hirayama, Shin; Ueda, Ryohei; Sugata, Kiyoshi

doi:10.1016/0196-8904(95)00098-x

Cited by 13 publications

(4 citation statements)

References 5 publications

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“…The rate of ROS accumulation in PSII increases with light intensity (Hirayama et al 1995) and has been linked by many investigators with photoinhibition (reviewed by Adir et al 2003), a process that reduces an organism's photosynthetic capacity as a result of excess light energy exceeding the ability for repair by PSII protein synthesis. Damage to the oxidizing side of the PSII reaction center via impaired electron donation from the oxygen-evolving complex (Callahan et al 1986), and/or damage to the reducing side via blocked electron flow from Q A -to Q B (Vass et al 1992), was singularly, or sequentially (Song et al 2006), implicated in eliciting ROS.…”

Section: Is Singlet O 2 Involved In D1 Protein Degradation?mentioning

confidence: 99%

D1-protein dynamics in photosystem II: the lingering enigma

2008

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The D1/D2 heterodimer core is the heart of the photosystem II reaction center. A characteristic feature of this heterodimer is the differentially rapid, light-dependent degradation of the D1 protein. The D1 protein is possibly the most researched photosynthetic polypeptide, with aspects of structure-function, gene, messenger and protein regulation, electron transport, reactive oxygen species, photoinhibition, herbicide binding, stromal-granal translocations, reversible phosphorylation, and specific proteases, all under intensive investigation more than three decades after the protein's debut in the literature. This review will touch on some treaded areas of D1 research that have, so far, defied clear resolution, as well as cutting edge research on mechanisms and consequences of D1 protein degradation.

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Section: Is Singlet O 2 Involved In D1 Protein Degradation?mentioning

confidence: 99%

D1-protein dynamics in photosystem II: the lingering enigma

2008

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“…To examine the photodynamic mechanisms behind the DNA photocleavage, a series of ROS scavengers, including NaN 3 for 1 O 2 , [28] SOD and catalase for superoxide anion radical (O 2 À· ), [29] and KI for COH, [30] were utilized to modulate the photocleavage activities of 6 and 7. As shown in Figure 9, only NaN 3 inhibits the photocleavage activity of 7 markedly, and this indicates a 1 O 2 mechanism or Type II mechanism for 7.…”

Section: Dna Photocleavagementioning

confidence: 99%

DNA Photocleavage by a Cationic BODIPY Dye through Both Singlet Oxygen and Hydroxyl Radical: New Insight into the Photodynamic Mechanism of BODIPYs

et al. 2012

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Two new NIR-absorbing BODIPY dyes, each bearing two pyridinium groups, are synthesized and their DNA-binding affinities and DNA photocleavage abilities examined in depth. While one BODIPY dye photocleaves DNA mainly through singlet oxygen, the other photocleaves DNA through both singlet oxygen and hydroxyl radical. To the best of our knowledge, this is the first example of a hydroxyl radical being involved in the photodynamic behavior of BODIPY-type dyes. EPR experiments confirm the ability of these and several related BODIPYs to generate superoxide anion radical and hydroxyl radical. This finding may shed light on the mechanism of BODIPY-based photodynamic therapy (PDT) and open a new avenue for development of more efficient BODIPY-type PDT agents.

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“…OH accumulation (7.57 nmol/mg protein) in tissue culture than what could be the consequence of high photosynthetic activity of plants in the blossoming phase, in accordance with statements that the . OH quantity increased according to the light intensity (Hirayama et al , ).…”

Section: Resultsmentioning

confidence: 99%

Comparative Study on Allium schoenoprasum Cultivated Plant and Allium schoenoprasum Tissue Culture Organs Antioxidant Status

Štajner

Popović

Ćalić³

et al. 2011

Phytotherapy Research

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This study was designed to examine Allium schoenoprasum tissue culture organs antioxidant and scavenging activity and to make a comparison between Allium schoenoprasum cultivated plant and Allium schoenoprasum tissue culture organs antioxidant activity. This study reports the results on the root, stalk and leaf antioxidant enzyme activities (superoxide dismutase, catalase, guaiacol peroxidase and glutathione peroxidase), reduced glutathione quantity, flavonoids and soluble protein contents and quantities of malonyldialdehyde and ·OH radical. In Allium schoenoprasum tissue culture organs the total antioxidant capacity was determined by the FRAP method and scavenger activity by the DPPH method. The present results indicated that the crude extract of Allium schoenoprasum tissue culture exhibited antioxidant and scavenging abilities in all investigated plant parts, especially in the roots. According to our results, the tissue culture plants exhibited the highest activities in the roots in contrast to the cultivated plants where highest activities were observed in the leaves.

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Effect of hydroxyl radical on intact microalgal photosynthesis

Cited by 13 publications

References 5 publications

D1-protein dynamics in photosystem II: the lingering enigma

D1-protein dynamics in photosystem II: the lingering enigma

DNA Photocleavage by a Cationic BODIPY Dye through Both Singlet Oxygen and Hydroxyl Radical: New Insight into the Photodynamic Mechanism of BODIPYs

Comparative Study on Allium schoenoprasum Cultivated Plant and Allium schoenoprasum Tissue Culture Organs Antioxidant Status

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