Title
The plant plasma membrane b-type cytochrome : a review The plant plasma membrane b-type cytochrome : a review
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Brussels ,
Subject
Biology
Source (journal)
Belgian journal of botany / Royal Botanical Society of Belgium. - Brussels, 1990 - 2009
Bulletin de la Société royale de botanique. - Bruxelles, 1862 - 1989
Volume/pages
127(1994) :2 , p. 171-183
ISSN
0778-4031
1781-8656
ISI
A1994QK87100007
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
The plasma membrane of higher plants contains a specific b-type cytochrome. This major component has a high standard redox potential (average E'(0) of + 140 mV) and an a-band absorption maximum near 561 nm. Ascorbic acid rapidly reduces the cytochrome but NADH or NADPH are ineffective as a reductant. The redox protein has been detected in purified plasma membranes of a variety of plant species and tissues and it appears to be a common plasma membrane component. Specific concentrations range from 20 to 400 pmol per mg protein. Initial attempts to purify the protein indicated a molecular weight of 31 kDa and suggest that the cytochrome may be a glycoprotein. The current hypotheses on the physiological importance of the plant plasma membrane cytochrome are focused on ascorbate-mediated transmembrane electron transport and blue light photoperception.
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