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이순희,조영동,홍영남,권영명 ( Sun Hi Lee,Young Dong Cho,Young Nam Hong,Young Myung Kwon ) 생화학분자생물학회 1982 BMB Reports Vol.15 No.2
Development of chloroplast, ability of CO₂-fixation, photosynthetic early intermediates and activities of catalase and glycolate oxidase were observed during greening process. Such results were discussed with the formation of CP-complex. The phenomenon of chloroplast development was similar to other plants, but the rate of process was relatively slow, and ability of CO₂-fixation was slow accordingly. The increase in chlorophyll was observed after more than 12 hours illumination. Such results were paralleled with the formation of CP-complex in thylakoid membrane. Considering the low ability of CO₂-fixation compared with that of other sun-plants, different photosynthetic intermediates at early period, and activities of both glycolate oxidase and catalase, ginseng is more likely to be C₃-plant.
인삼엽(人蔘葉)의 엽록체발달(葉綠體發達)과 $CO_2$ 고정양상(固定樣相)에 관한 연구(硏究)
이순희,조영동,홍영남,권영명,Lee, Sun-Hi,Cho, Young-Dong,Hong, Young-Nam,Kwon, Young-Myung 생화학분자생물학회 1982 한국생화학회지 Vol.15 No.2
인삼엽의 greening과정중 엽록체발달(葉綠體發達), $CO_2$ 고정능(固定能), 초기(初期) 광합성(光合成) 중간대사산물(中間代謝産物), catalase와 glycolate oxidase 활성등을 조사(調査)하였고, 이러한 결과(結果)들은 CP-complex의 생성(生成)과 연관시켜 논의(論議)하였다. 엽록체발달양상(葉綠體發達樣相)은 타식물(他植物)과 같았으나 그 과정(過程)이 비교적 느렸고, 따라서 $CO_2$고정능(固定能)도 느렸다. 12시간 이상(以上) 빛을 조사(照射)하여야 엽록소양(量)이 증가하였다. 이러한 결과(結果)는 엽록체발달(葉綠體發達)에 따라 thylakoid막(膜)에서 CP-cmplex의 생성(生成)의 증가와 일치하였다. $CO_2$고정능(固定能)은 다른 양지식물(陽地植物)에 비하여 훨씬 낮았으며, 초기(初期) 광합성(光合成) 중간대사산물(中間代謝産物)의 변이(變異)와 glycolate oxidase 및 catalase 등의 활성(活性)으로 보아 인삼은 $C_3$-plant임을 추정할 수 있었다. Development of chloroplast, ability of $CO_2$-fixation, photosynthetic early intermediates and activities of catalase and glycolate oxidase were observed during greening process. Such results were discussed with the formation of CP-complex. The phenomenon of chloroplast development was similar to other plants, but the rate of process was relatively slow, and ability of $CO_2$-fixation was slow accordingly. The increase in chlorophyll was observed after more than 12 hours illumination. Such results were paralleled with the formation of CP-complex in thylakoid membrane. Considering the low ability of $CO_2$-fixation compared with that of other sun-plants, different photosynthetic intermediates at early period, and activities of both glycolate oxidase and catalase, ginseng is more likely to be $C_3$-plant.
생체 생장에 관한 세포 생물학적 연구 - 당근 세포의 D - glucose - 6 - phosphate cyclohydrolase 활성에 미치는 polyamine 의 영향 -
조영동(Young Dong Cho),이순희(Sun Hi Lee),강영희(Young Hee Kang),김명원(Myeong Won Kim),김성호(Seong Ho Kim),진언선(Eon Seon Jin) 한국식물학회 1986 Journal of Plant Biology Vol.29 No.4
Effects of putrescine, spermidine and spermine on the activity of D-glucose-6-phosphate cyclohydrolase in the Daucus carota L. protoplast cultured for 4 days and effects of polyamines on the incorporation of D-[u^-14C]-glucose treated to protoplasts in culturemedium were investigated. The activity of D-glucose-6-phosphate cyclohydrolase was increased by polyamines and among them spermine was the most effective. Polyamines increased protein synthesis and this due to the increasing effect of the polyamines on the synthesis of glycoprotein which is one of cell wall components. The synthesis of cell polysaccharides, such as pectic substances, hemicelluloses and celluloses was increased by polyamines, which stimulated synthesis of pectin substances and hemicellulose more greatly than that of cellulose, and spermidine was the most effective. In the light of the above results it seems that the polyamines increase cell wall regeneration by the stimulation of enzyme activities which synthesize cell wall components.
생체생장에 관한 세포생물학적 연구 - Polyamine 과 auxin 이 β - 1 , 4 - endoglucanase 활성에 미치는 영향
조영동(Young Dong Cho),강정훈(Jung Hoon Kang),이영미(Young Mee Lee),이순희(Sun Hi Lee),이준승(June Seung Lee),강영희(Young Hee Kang) 한국식물학회 1988 Journal of Plant Biology Vol.31 No.3
Spermidine, spermine and IAA promoted an increase in β-1,4-endoglucanase activity in hypocotyls of Clycine max. The optimal concentration for the increase of the enzyme activity was 10^-6 M for spermidine, 10^-8 M for spermine and 10^-6 M for IAA. However, IAA had innocuous effect on arginine decarboxylase and ornithine decarboxylase activities, and the content of polyamine. Such cumulative results suggest that the increase in β-1,4-endoglucanase activity by IAA is not attributed by the effect on the biosynthesis of polyamine by IAA but spermidine, spermine and IAA induce cell wall loosening and therefore extension growth of cells.
조영동(Young Dong Cho),강영희(Young Hee Kang),이순희(Sun Hi Lee),조명제(Myung Je Cho) 한국식물학회 1984 Journal of Plant Biology Vol.27 No.2
Palmitoyl CoA was found to inhibit corn embryo axis glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase, which were also inhibited by polyamines. However, reversal of inhibition of both enzymes by palmitoyl CoA was made by spermine. Activity of corn embryo axis protein kinase was found to increase steadily after germination. Activation and inhibition of protein kinase were made by MgCl_2 and all polyamines, respectively. Such results suggest that fatty acid biosynthesis and lypolysis could be regulated to some extent by polyamines in corn embryo axis.
생체발생 및 분화기구의 세포생물학적 연구 8 - 2. 옥수수 배젓에서 Peptide 가 cAMP Level 에 미치는 영향
조영동(Young Dong Cho),강영희(Young Hee Kang),이순희(Sun Hi Lee),김성기(Seong Ki Kim) 한국식물학회 1984 Journal of Plant Biology Vol.27 No.1
Activities of corn endospern adenylate cyclase and phosphodiesteraes were found right after germination, and phosphodiesterase activity was shown to increase steadily. Protease activity was also found. Corn peptide fraction purified by using Sephadex G-25 column was shown to enhance corn phosphodiesterase activity but inhibit bovine phosphodiesterase activity. And the fraction inhibits corn adenylate cyclase activity. Trypsintreated peptide fraction was shown to enhance phosphodiesterase activity 80% compared to that of native peptide fraction. However, in case of DNase phosphodiesteraes was shown to be innocuous. According to cumulative results, it is more likely that peptide fraction produced by protease inhibits adenylate cyclaes activity and enhance phosphodiesterase, decreasing cAMP level.
생체생장에 관한 세포생물학적 연구 - 당근 뿌리의 원형질체에서 polyamine 과 Ca2+ 이 β - glucan synthetase 활성도에 미치는 영향
이순희(Sun Hi Lee),강영희(Young Hee Kang),표병식(Byoung Sik Pyo),조영동(Young Dong Cho),김명원(Myeong Won Kim),이준승(June Seung Lee) 한국식물학회 1987 Journal of Plant Biology Vol.30 No.3
The effect of polyamine, Ca^2+ and calmodulin on GS(β-glucan synthetase) activity was studied in Daucus carota root. The Ca^2+ is shown to have no effect on the GS activity wherease the GS Ⅱ activity is increase in response to increase in concentration of the Ca^2+. When the protoplasts are cultured, for 4 days, the GS Ⅱ activity increases as a tunction of time and reaches a maximum after 3 dyays at a time when the network of cellulose microfibrils is known to be synthesized. The effect of the Ca^2+ and 1 mM spermine on the GS Ⅱ activity turns out to be synergistic, especially more synergistic at lower concentration of the Ca^2+. The GS Ⅱ activity seems to be enhanced by the Ca^2+. The GS Ⅱ activity in the protoplast treated by the calcium channel blocker, verapamil, turns out to be lower than that of the control. Cumulative results suggest that the Ca^2+ stimulates the cell wall regeneration via enhancement of the GS Ⅱ activity responsible for synthesizing the cell wall component throught synergistic effect with spermine.
이순희(Sun Hi Lee),강영희(Young Hee Kang),진언선(Eon Seon Jin),조영동(Young Dong Cho),김명원(Myeong Won Kim),이준승(June Seung Lee) 한국식물학회 1987 Journal of Plant Biology Vol.30 No.4
The effect of polyamine and Ca^2+ on D-glucose-6-phosphate cyclohydrolase activity was studied in Daucus carota root. The enzyme activity was reduced in response to increase in concentration of Ca^2+, not the Ca^2+-calmodulin complex. The inhibition effect due to Ca^2+ was reversed by polyamine, especially remarkable at low concentration of Ca^2+. The effect of the Ca^2+ on the enzyme seemed to compete wth polyamine according to the Lineweaver-Burk plot. The enzyme activity from carrot root protoplast cultured in the prescence of verapamil was higher than that of the control. Such cumulative results suggest that the inhibition by the Ca^2+ and enhancement or reversal by polyamine could regulate the biosynthesis of pectin and hemicellulose to some extent.
권영명(Young Myung Kwon),이진범(Jin Bum Lee),이순희(Sun Hi Lee),조영동(Young Dong Cho) 한국식물학회 1979 Journal of Plant Biology Vol.22 No.3
Catalase, glycolate oxidase, hydroxypyruvate and NADPH-glyoxylate reductases activities in cell free extracts from leaves of 3 cultivars, Suwon 264, IR 36 and Jin Heung of rice plants were studied at different growing stages. Catalase and glycolate oxidase shows inclining activities toward the maximum vegetative growth whereas declining activities in either the enzymes were noticed during the maturing stage. After the photopeiodic condition exhibit increasing hydroxypyruvate and NADPH-glyoxylate reductases activities with time until maturing stage. No significant differences were found in the enzyme activities, and in analytical data of nitrogen, chlorophyⅡ contents, dry weight and soluble proteins among the 3 cultivars.
생체 발생 및 분화기구의 (分化機構) 세포생물학적 연구 - X. Polyamine 이 Glucan Synthetase 활성에 미치는 영향
조영동(Young Dong Cho),이순희(Sun Hi Lee),김명원(Myung Won Kim),이현모(Hyun Mo Lee) 한국식물학회 1985 Journal of Plant Biology Vol.28 No.3
The activity of Daucus carota L. root β-gluean synthetase Ⅱ was observed to increase in the presence of polyamines such as putrescine, spermidine and spermine in vitro, whereas the activity of Daucus carota L. root β-glucan synthetase I was not affected by the polyamine. The activity of β-glucan synthetase Ⅱ from Daucus carota L. root protoplasts cultured on medium containing 10^-6M polyamines such as putrescine, spermidine and spermine was observed to be higher than that of the control. Daucus carota L. root protoplasts were observed to have the activities of arginine and ornithine decarboxylases and it was noted that they could produce polyamines, which might have an effect on β-glucan synthetase Ⅱ activity.