TY - JOUR
T1 - Comparative Electrochemical Study of Superoxide Reductases
AU - Moura, José João Galhardas de
AU - Moura, Isabel Maria Andrade Martins Galhardas de
AU - Cordas, Cristina
PY - 2011/1/1
Y1 - 2011/1/1
N2 - Superoxide reductases are involved in relevant biological electron transfer reactions related to protection against oxidative stress caused by reactive oxygen species. The electrochemical features of metalloproteins belonging to the three different classes of enzymes were studied by potentio-dynamic techniques (cyclic and square wave voltammetry): desulfoferrodoxin from Desulfovibrio vulgaris Hildenborough, class I superoxide reductases and neelaredoxin from Desulfovibrio gigas and Treponema pallidum, namely class II and III superoxide reductases, respectively. In addition, a small protein, designated desulforedoxin from D. gigas, which has high homology with the N-terminal domain of class I superoxide reductases, was also investigated. A comparison of the redox potentials and redox behavior of all the proteins is presented, and the results show that SOR center II is thermodynamically more stable than similar centers in different proteins, which may be related to an intramolecular electron transfer function.
AB - Superoxide reductases are involved in relevant biological electron transfer reactions related to protection against oxidative stress caused by reactive oxygen species. The electrochemical features of metalloproteins belonging to the three different classes of enzymes were studied by potentio-dynamic techniques (cyclic and square wave voltammetry): desulfoferrodoxin from Desulfovibrio vulgaris Hildenborough, class I superoxide reductases and neelaredoxin from Desulfovibrio gigas and Treponema pallidum, namely class II and III superoxide reductases, respectively. In addition, a small protein, designated desulforedoxin from D. gigas, which has high homology with the N-terminal domain of class I superoxide reductases, was also investigated. A comparison of the redox potentials and redox behavior of all the proteins is presented, and the results show that SOR center II is thermodynamically more stable than similar centers in different proteins, which may be related to an intramolecular electron transfer function.
KW - Iron-sulfur centers
KW - Electrochemistry
KW - Metalloproteins
KW - Superoxide reductases
U2 - 10.1007/s00249-011-0777-1
DO - 10.1007/s00249-011-0777-1
M3 - Article
SN - 0175-7571
VL - 41
SP - 209
EP - 215
JO - European Biophysics Journal With Biophysics Letters
JF - European Biophysics Journal With Biophysics Letters
IS - 2
ER -