Redox potentials of some metalloproteins
Makovkina, L.E.; Mestechkina, N.M.; Kuzhetsov, E.A.; Mytuskii, A.A.; Pshenova, K.V.
Biokhimiia 43(3): 564-567
1978
ISSN/ISBN: 0320-9725 PMID: 207361 Document Number: 137486
The standard redox potentials of soluble cytochromes c isolated from the green alga Chlorella and the blue-green algae Spirulina and Aphanezomenon were determined by potentiometric titration and found to be equal to +380 mB, +330 mB and +357 AB, respectively. The standard redox potentials of plastocyanin preparations from Pisum sativum and Atriplex leaves were also determined and found close to those of soluble cytochromes c, i. e. +395 mB and +375 mB, respectively. The metalloproteins studied were shown to belong to monoelectron carriers operating at the donor sites of photosystem I.