b-type cytochromes in higher plant plasma membranes

The composition and characteristics of b-type cytochromes from higher plant plasma membranes, purified using aqueous two-phase partitioning, were investigated. At least three different cytochromes were identified by their wavelength maxima and redox midpoint potentials (Eo'). Cytochrome b-560.7...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1989-07, Vol.90 (3), p.1077-1083
Main Authors: Asard, H. (University of Antwerp, Antwerp, Belgium), Venken, M, Caubergs, R, Reijnders, W, Oltmann, R.L, De Greef, J.A
Format: Article
Language:English
Subjects:
Adenosine triphosphatases
Biological and medical sciences
BRASSICA
Cauliflower
Cell biochemistry
Cell membranes
Cell physiology
COENZIMAS
COENZYME
CUCURBITA PEPO
Cytochromes
Enzymes
ESTRUCTURA CELULAR
Fundamental and applied biological sciences. Psychology
Intracellular membranes
Membranes and Bioenergetics
METALLOPROTEINE
METALPROTEINAS
NUCLEOTIDE
NUCLEOTIDOS
PHASEOLUS VULGARIS
Plant physiology and development
Plants
STRUCTURE CELLULAIRE
Titration
Tonoplast
Wavelengths
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Summary:The composition and characteristics of b-type cytochromes from higher plant plasma membranes, purified using aqueous two-phase partitioning, were investigated. At least three different cytochromes were identified by their wavelength maxima and redox midpoint potentials (Eo'). Cytochrome b-560.7 (Eo' from +110 to +160 millivolts) was present in zucchini (Cucurbita pepo) hypocotyls and bean (Phaseolus vulgaris L.) hooks, although in different concentrations. The main component in cauliflower (Brassica oleracea L.) inflorescences (cytochrome b-558.8) is probably functionally similar to this cytochrome. The plasma membrane generally contains two to three cytochrome species. However, the occurrence and concentrations were species dependent. The high potential cytochrome can be reduced by ascorbate but not NADH, and may be involved in blue light perception
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.90.3.1077