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논문 기본 정보

자료유형
학술저널
저자정보
Kang, Kyong-Suk (Division of Biology, Kangwon National University) Lim, Chang-Jin (Division of Biology, Kangwon National University) Han, Tae-Jin (Division of Biology, Hallym University) Kim, Joon-Chul (Division of Biology, Kangwon National University) Jin, Chang-Duck (Division of Biology, Kangwon National University)
저널정보
한국식물학회 식물학회지 식물학회지 제42권 제3호
발행연도
1999.1
수록면
187 - 193 (7page)

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The changes on isozyme profiles of catalase (CAT), peroxidase (POD), ascorbate peroxidase (APX), and glutathione reductase (GR) during severe deactivation of total CAT activity by aminotriazole (AT) treatment were investigated in the leaves of Arabidopsis thaliana (Columbia ecotype) in relation to H2O2-mediated oxidative stress. In spite of striking deactivation of total CAT activity by 0.1 mM AT, there were no significant differences in H2O2 levels or total leaf soluble protein contents including a Rubisco in both thecontrol and AT-treated leaves. On the other hand, one specific protein band (molecular mass, 66 KD) was observed on the SDS-gel from leaf soluble proteins whose staining intensity was strikingly enhanced by AT treatment for 6h. However, this band disappeared at 12h. In the native-gel assays of CAT, POD, APX and GR isozymes, AT remarkably inhibited the expression of the CAT1 isozyme with no effects on CAT2 and CAT3, and generally had no effect on POD isozyme profiles. However, AT stimulated the intensity of activities of pre-existing APX1 and GR1 isozymes. In particular, it induced a new synthesis of one GR isozyme. Therefore, these results collectively suggest that a striking deactivation of total CAT activity by AT in A. thaliana leaves largely results from the suppression of CAT1 isozyme, and that APX1, GR1, and a newly synthesized GR isozyme could complement the role of CAT1 to metabolize H2O2 into non-toxic water.

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