1.8.5.8	hydrogen sulfide + glutathione + a quinone	-	
1.8.5.8	hydrogen sulfide + glutathione + coenzyme Q	-	
1.8.5.8	hydrogen sulfide + glutathione + quinone	-	
1.8.5.8	hydrogen sulfide + glutathione + ubiquinone	-	
1.8.5.8	additional information	under physiological conditions, the primary sulfane sulfur acceptor for the SQOR reaction is GSH, generating glutathione persulfide (GSSH) as the product. Substrate promiscuity leads to dead-end complexes. Human SQOR exhibits remarkable substrate promiscuity, and in addition to sulfide, a number of nucleophiles can add to the resting trisulfide. The addition of alternative nucleophiles to resting SQOR leads to the corresponding 379Cys mixed disulfide and the 201Cys-SS- persulfide that forms an intense charge transfer (CT) complex with FAD. Unlike the sulfide-induced CT complex, which decays quickly to yield FADH2, the alternative CT complexes represent dead-end complexes and decay slowly at rates that approximate the respective dissociation rate constants (koff) for the nucleophiles. Although these dead-end complexes could entrap SQOR in an unproductive state, their formation is suppressed to some extent by the membrane environment of SQOR