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논문 기본 정보

자료유형
학술저널
저자정보
Min, Youn-Mi (Department of Biochemistry, Chungbuk National University) Choi, Eui-Chang (Department of Biochemistry, Chungbuk National University) Chae, Quae (Department of Biochemistry, Chungbuk National University)
저널정보
한국광과학회 Journal of photoscience : an international journal officail organ of the korean society of photoscience Journal of photoscience : an international journal officail organ of the korean society of photoscience 제2권 제1호
발행연도
1995.1
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1 - 5 (5page)

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The activity of phospholipase A$_2$ (PLA$_2$) was identified and characterized from cytosolic and membrane fractions of oat cells, respectively. PLA$_2$ activity was determined fluorometrically in the presence of serum albumin using phospholipids labeled at sn-2-acyl position with 10-pyrenyldecanoic acid. When the cell-free extracts of oat tissues were fractionated by ultracentrifugation at 100,000 x g and the PLA$_2$ activity was assayed, we found that most of the PLA$_2$ activity was revealed from the cytoplasmic fraction rather than from the membrane fraction. The activity of cytosolic PLA$_2$ was dependent on Ca$^{2+}$ concentration and the optimum concentration of Ca$^{2+}$ was found to be 100 $\mu$M. It was also found that PLA$_2$ could be translocated toward the membrane site from the cytosol upon increasing Ca$^{2+}$ concentration. These results might suggest that an increased [Ca$^{2+}$]$_i$ by phytochrome action could promote the translocation of the cytosolic PLA$_2$ toward the membrane site.

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