Table 5. Apparent second order rate constants for reaction of selected biological oxidants with the amino acid cysteine in different environments at neutral pH (∼7.4) and ∼22°C.

Data from [4-6,47,275-282].

Oxidant	Cysteine environment	Apparent second order rate constant (M−1·s−1)
HOCl	Free amino acid	3.6×108
	Cys in GSH	1.2×108
HOSCN	Free amino acid	7.8×104
	Cys in GSH	2.5×104
	Cys-34 in BSA	7.6×104
ONOOH	Free amino acid	2.6×103
	Cys in GSH	7.3×102
	Cys-34 in BSA	3.8×103
	Active site Cys in peroxiredoxin 5	7×107
H2O2	Free amino acid	0.84
	Cys in GSH	0.42
	Cys-34 in BSA	2.3
	Active site Cys in peroxiredoxin 2	∼107