MIDPOINT REDOX POTENTIALS OF PLANT AND ALGAL FERREDOXINS
MIDPOINT REDOX POTENTIALS OF PLANT AND ALGAL FERREDOXINS
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DOI：
10.1042/bj1680205
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发表时间：
1977-01-01
影响因子：
4.1
通讯作者：
ROGERS, LJ
中科院分区：
文献类型：
--
作者：
CAMMACK, R;RAO, KK;ROGERS, LJ
Midpoint potentials of plant-type ferredoxins from a range of sources were measured by redox titrations combined with EPR spectroscopy. For ferredoxins from higher plants, green algae and most red algae, the midpoint potentials (at pH 8.0) were between -390 and -425 mV. Values for the major ferredoxin fractions from blue-green algae were less negative (between -325 and -390 mV). Spirulina maxima and Nostoc strain MAC contain minor ferredoxin components with a different potential, -305 mV (the highest so far measured for a plant-algal ferredoxin) for Spirulina ferredoxin II, and -455 mV (the lowest so far measured for a plant-algal ferredoxin) for Nostoc strain MAC ferredoxin II. Two ferredoxins extracted from a variety of the higher plant Pisum sativum (pea) had midpoint potentials that were only slightly different from each other. These values are discussed in terms of possible roles for the ferredoxins in addition to their involvement in photosynthetic electron transport.
