A complex containing both trypsin inhibitor and dehydroascorbate reductase activities isolated from mitochondria of etiolated mung bean (Vigna radiata L. (Wilczek) cv. Tainan No. 5) seedlings

Wen C. Hou, Yuh T. Wang, Yaw Huei Lin, Lin June Hsiao, Tzeng E. Chen, Chiu W. Wang, Hwa Dai

研究成果: 雜誌貢獻文章

9 引文 斯高帕斯(Scopus)

摘要

A complex containing trypsin inhibitor (TI) activity was extracted with 0.1 M TRIS buffer (pH 7.9) from trypsin-treated mitochondria of etiolated mung bean seedlings, and further purified with a Superdex 200 FPLC column. This partially purified complex with an Mr about 820 kDa exhibited additional dehydroascorbate (DHA) reductase activity with specific activities of 0.21, 1.53 and 1.54 μmol ascorbate formed min-1 mg-1 protein at pH 6.0, 6.5 and 7.0, respectively, when glutathione was added. Much lower DHA reductase activity (0.013 and 0.026 μmol ascorbate formed min-1 mg-1 protein at pH 6.5 and 7.0, respectively) was found when glutathione was omitted. The isolated complex gave positive results when it was tested by TI activity staining after SDS-PAGE, and could be recognized by a polyclonal antibody which was raised against 38 kDa sweet potato Kunitz-type TI, one of the root storage proteins of sweet potato. The possible physiological functions of this complex with both TI and DHA reductase activities were discussed.

原文英語
頁(從 - 到)713-719
頁數7
期刊Journal of Experimental Botany
51
發行號345
出版狀態已發佈 - 四月 2000
對外發佈Yes

ASJC Scopus subject areas

  • Plant Science

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