Table 4.

Major enzymatic ROS scavengers in the antioxidant mechanisms. RX = redoxin, DHA = dehydroascorbate, AsA = ascorbate, MDHA = monodehydroascorbate. Adapted from ref. [8].

Scavenger	Acronym	Catalyzed Reaction
Superoxide dismutase	SOD	$\begin{array}{l}{\mathrm{M}}^{(\mathrm{n}+1)+}{+\mathrm{SOD}+\mathrm{O}}_2^{-}\to {\mathrm{M}}^{\mathrm{n}+}{+\mathrm{SOD}+\mathrm{O}}_2\\ {\mathrm{M}}^{\mathrm{n}+}{+\mathrm{SOD}+\mathrm{O}}_2^{-}{+2\mathrm{H}}^{+}\to {\mathrm{M}}^{(\mathrm{n}+1)+}{+\mathrm{SOD}+\mathrm{H}}_2{\mathrm{O}}_2\end{array}$
Catalase	CAT	${2\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{O}}_2{+2\mathrm{H}}_2\mathrm{O}$
Ascorbate peroxidase	APX	${\mathrm{H}}_2{\mathrm{O}}_2+\mathrm{AsA}\to {\mathrm{DHA}+2\mathrm{H}}_2\mathrm{O}$
Monodehydroascorbate reductase	MDHAR	$\mathrm{MDHA}+\mathrm{NAD}\left(\mathrm{P}\right)\mathrm{H}\to {\mathrm{AsA}+\mathrm{NAD}\left(\mathrm{P}\right)}^{+}$
Glutatione peroxidase	GPx	$\begin{array}{l}{2\mathrm{GSH}+\mathrm{H}}_2\mathrm{O}\to {\mathrm{GSSG}+2\mathrm{H}}_2\mathrm{O}\\ 2\mathrm{GSH}+\mathrm{ROOH}\to {\mathrm{GSSG}+\mathrm{ROH}+\mathrm{H}}_2\mathrm{O}\end{array}$
Glutatione transferase	GST	$\mathrm{RX}+\mathrm{GSH}\to \mathrm{HX}+\mathrm{R}-\mathrm{S}-\mathrm{GSH}$