Catalyzes the oxidation of hydrogen sulfide with the help of a quinone, such as ubiquinone-10, giving rise to thiosulfate and ultimately to sulfane (molecular sulfur) atoms. Requires an additional electron acceptor; can use sulfite, sulfide or cyanide (in vitro). It is believed the in vivo electron acceptor is glutathione. 2 H(+) + hydrogen sulfide + sulfite + ubiquinone-10 = thiosulfate + ubiquinol-10 a quinone + glutathione + H(+) + hydrogen sulfide = a quinol + S-sulfanylglutathione glutathione + H(+) + hydrogen sulfide + ubiquinone-10 = S-sulfanylglutathione + ubiquinol-10 Binds 1 FAD per subunit. Belongs to the SQRD family.