▁between ▁this ▁c yst e ine ▁pair ▁increases ▁struct ural ▁stability ▁and ▁provides ▁resistance ▁to ▁over - ox id ation ▁induced ▁en zym atic ▁in activ ation . ▁ ▁Function ▁▁ ▁Gr x 2 ▁functions ▁as ▁a ▁part ▁of ▁the ▁cell ular ▁re do x ▁signal ing ▁path way ▁and ▁ant io x id ant ▁defense ▁mechanism . ▁As ▁a ▁GR X ▁family ▁protein , ▁Gr x 2 ▁acts ▁as ▁an ▁electron ▁don or ▁to ▁deg l ut ath ion yl ate ▁prote ins . ▁It ▁has ▁also ▁been ▁shown ▁to ▁reduce ▁both ▁th ior ed ox in ▁ 2 ▁and ▁th ior ed ox in ▁ 1 ▁and ▁protect s ▁cells ▁from ▁apo pt osis ▁induced ▁by ▁aur an of in ▁and ▁ 4 - h ydro x yn onen al . ▁Gr x 2 ▁is ▁also ▁an ▁electron ▁accept or . ▁ ▁It ▁can ▁catal y ze ▁the ▁revers ible ▁ox id ation ▁and ▁gl ut ath ion yl ation ▁of ▁mit och ond rial ▁memb rane ▁th i ol ▁prote ins . ▁Additionally , ▁N AD PH ▁and ▁th ior ed ox in ▁re duct ase ▁efficiently ▁reduce ▁both ▁the ▁active ▁site ▁dis ulf ide ▁of ▁Gr x 2 ▁and ▁the ▁G SH - Gr x 2 ▁intermediate ▁formed ▁in ▁the ▁reduction ▁of ▁gl ut ath ion yl ated ▁substr ates . ▁ ▁En zym atic ▁activity ▁of ▁Gr x 2 ▁leads ▁to ▁its ▁role ▁in ▁reg ulating ▁re do x - indu ced ▁apo pt osis . ▁Gr x