Journal of Microbiology

Kee-Oh Chay

3 Articles

Effect of Light and Reductones on Differentiation of Pleurotus ostreatus: Seung-Rock Lee , Woo-Jeong Joo , Yong-Un Baek , Inyoung Kim , Kee-Oh Chay , Seung-Hyun Cho , Seung-Jae Lee , Sa-Ouk Kang; J. Microbiol. 2011;49(1):71-77. Published online March 3, 2011; DOI: https://doi.org/10.1007/s12275-011-0507-5

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Vegetative mycelia of Pleurotus ostreatus were differentiated into primordia and subsequently into fruit bodies in synthetic sucrose-asparagine medium when exposed to light at low temperature. During photomorphogenesis, L-ascorbic acid-like substances called reductones were produced. L-Ascorbic acid, D-erythroascorbic acid, 5-O-(α-D-glucopyranosyl)-D-erythroascorbic acid, 5-O-(α-D-xylopyranosyl)-D-erythroascorbic acid, 5-methyl-5-O-(α-D-glucopyranosyl)-D-erythroascorbic acid and 5-methyl-5-O-(α-D-xylopyranosyl)-D-erythroascorbic acid were accumulated initially in the illuminated mycelia before the initiation of fruiting. The content of glycosides of erythroascorbic acid and their methylated compounds increased again in the primordia and the fruit bodies. Exogenous L-ascorbic acid induced the formation of primordia from the mycelia in the dark in a dose-dependent manner. Thus, this suggests that these reductones might play a role in mediating the light stimulus in photomorphogenesis.

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Contribution of Bioactive Compounds to the Antioxidant Capacity of the Edible Mushroom Neolentinus lepideus
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Chemistry & Biodiversity.2021;[Epub] CrossRef
Effects of exogenous ascorbic acid on the mycelia growth and primordia formation of Pleurotus ostreatus
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Intracellular Substrates of a Heme-Containing Ascorbate Oxidase in Pleurotus ostreatus: Seung-Rock Lee , Woo-Jeong Joo , Yong-Un Baek , Youn-Kyong Lee , Seong-Woon Yu , Yeon-Ran Kim , Kee-Oh Chay , Seung-Hyun Cho , Sa-Ouk Kang; J. Microbiol. 2009;47(6):801-801.

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Abstract PDF: In the online version of the article the name of the second corresponding author is misspelled. The correct spelling is Sa-Ouk Kang. The online version of the original article can be found under doi: 10.1007/s12275-008-0307-8

Intracellular Substrates of a Heme-Containing Ascorbate Oxidase in Pleurotus ostreatus: Seung-Rock Lee , Woo-Jeong Joo , Yong-Un Baek , Youn-Kyong Lee , Seong-Woon Yu , Yeon-Ran Kim , Kee-Oh Chay , Seung-Hyun Cho , Sa-Ouk Kang; J. Microbiol. 2009;47(2):178-186. Published online May 2, 2009; DOI: https://doi.org/10.1007/s12275-008-0307-8

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Abstract PDF

A novel heme-containing ascorbate oxidase isolated from oyster mushroom, Pleurotus ostreatus, catalyzes oxidation of ascorbic acid (Kim et al., 1996). In this report, we describe the identification of intracellular substrates of the enzyme in the mushroom. Six compounds, which can serve as substrate of the heme-containing ascorbate oxidase, were identified as L-ascorbic acid, D-erythroascorbic acid, 5-O-(α-D-glucopyranosyl)-D-erythroascorbic acid, 5-O-(α-D-xylopyranosyl)-D-erythroascorbic acid, 5-methyl-5-O-(α-D-glucopyranosyl)-D-erythroascorbic acid, and 5-methyl-5-O-(α-D-xylopyranosyl)-D-erythroascorbic acid. All of the compounds were oxidized at a significant rate by the heme-containing ascorbate oxidase. Oxidation of the compounds produced equimolar amounts of hydrogen peroxide per mole of substrate.

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Journal of Fungi.2021; 7(3): 196. CrossRef
Contribution of Bioactive Compounds to the Antioxidant Capacity of the Edible Mushroom Neolentinus lepideus
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Chemistry & Biodiversity.2021;[Epub] CrossRef
Effects of exogenous ascorbic acid on the mycelia growth and primordia formation of Pleurotus ostreatus
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Sze Ying Leong, Indrawati Oey, David John Burritt
Food and Bioprocess Technology.2015; 8(4): 811. CrossRef
Effect of light and reductones on differentiation of Pleurotus ostreatus
Seung-Rock Lee, Woo-Jeong Joo, Yong-Un Baek, Inyoung Kim, Kee-Oh Chay, Seung-Hyun Cho, Seung-Jae Lee, Sa-Ouk Kang
The Journal of Microbiology.2011; 49(1): 71. CrossRef

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