REACTIVE OXYGEN SPECIES - Oxidation of Amino Acids, Peptides, and Proteins: Kinetics and Mechanism - page 138

TABLE 4.4. Spectroscopic and Redox Properties of SOR's Catalytic Center

Oxidized λ max (nm)

E ° (mV)
center II

T1-Fe 3+ “Hydroperoxo”
λ max (nm) Low pH High pH p K a k 1 (×10 9 /M/s) k 2 (Neutral pH) (s −1 )

2Fe-SOR
A. fulgidus

630 540 365 8.5 580 0.6 57

D. vulgaris 647 560 250 - 590 1.5 40

D. vulgaris E47A - - - - 600 1.5 65

D. vulgaris
K48A

- - - - 600 0.21 25

D. baarsii 644

(pH 7.6)

- 350

(pH 6-9)

9 610 1.1 500

D. baarsii E47A 580

(pH 7.6)

- 520

(pH5.5-
6.5)

6.6 630 1.2 440

D. baarsii K48A 635

(pH 7.6)

- 520

(pH5.5-
6.5)

7.6 600 0.38 300

1Fe-SOR
A. fulgidus 666 590 250 9.6 620 1.2 400

A. fulgidus E12V 670 590 302 6.3 620 0.22 400

N. equitans 655 550 350 6.5 590 1 <10

650 560 200 6 610 0.6 4800

T. pallidum

T. pallidum
E48A

650 560 - 6 600 0.6 2080

D. gigas 666 590 190 >9 - - -

Adapted from Pinto et al. [115] with the permission of Elsevier Inc.