The Electron-Transfer Kinetics of Spinach Ferredoxin with Strong Reductants

Authors

Sipra Ray Dasgupta, Marquette University
Michael D. Ryan, Marquette UniversityFollow

Document Type

Article

Language

eng

Format of Original

8 p.; 25 cm

Publication Date

6-18-1982

Publisher

Elsevier

Source Publication

Biochimica et Biophysica Acta: Bioenergetics

Source ISSN

0005-2728

Original Item ID

doi: 10.1016/0005-2728(82)90135-9

Abstract

The reduction of spinach ferredoxin by V(II)-EDTA, Eu(II)-DPTA and propylene viologen was monitored electrochemically. The rates of these reactions were found to be 3.0 · 10⁴, 3.2 · 10⁵ and 1.2 · 10⁵ M⁻¹ · s⁻¹, respectively, by the use of chronoamperometry, pulse polarography, differential pulse polarography and rotating-disk voltammetry. These reaction rates were analyzed by tunneling theory for electron transfers, and the comparisons between the theoretical and experimental values were quite good. The tunneling theory also worked quite well with other ferredoxin electron-transfer rates that are available in the literature. In addition to that, the activation enthalpy and entropy compared well with the tunneling theory.

Comments

Biochimica et Biophysica Acta: Bioenergetics, Vol. 680, No. 3 (June 1982): 242-249. DOI.

Recommended Citation

Dasgupta, Sipra Ray and Ryan, Michael D., "The Electron-Transfer Kinetics of Spinach Ferredoxin with Strong Reductants" (1982). Chemistry Faculty Research and Publications. 435.
https://epublications.marquette.edu/chem_fac/435