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Plant and Cell Physiology, 1986, Vol. 27, No. 3 407-415
© 1986

Article

Ferredoxin Isolated from Plant Non-Photosynthetic Tissues. Purficaition and Characterization

Keishiro Wada, Masaaki Onda and Hiroshi Matsubara

Department of Biology, Faculty of Science, Osaka University Toyonaka, Osaka 560, Japan

A ferredoxin was isolated from non-photosynthetic tissues of the lower storage root of radish (Raphanus sativus L. var. acantiformis cultivar Miyashige) in a pure form by conventional means. It showed the characteristic features in its absorption spectrum of chloroplast-type ferredoxin. However, amino acid composition and amino (N)- terminal sequence were different from those of radish leaf ferredoxin. Root ferredoxin was able to transfer electrons from dithionite to nitrite reductase [EC 1.7.7.1 [EC] ] isolated from mung bean seedling roots and also to mediate NADP+ photoreduction in spinach broken chloroplasts.

It therefore is suggested that a set of distinctive molecular species of ferredoxin is present in non-photosynthetic tissues and functions as a redox mediator in ferredox-independent enzyme systems.

(Received October 18, 1985; Accepted January 16, 1986)
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