[DsrC protein]-disulfide + hydrogen sulfide + H(+) <=> [DsrC protein]-S-sulfanyl-L-cysteine/L-cysteine
[dsrc protein]-disulfide + hydrogen sulfide + h(+) <=> [dsrc protein]-s-sulfanyl-l-cysteine/l-cysteine
[DsrC protein]-disulfide + hydrogen sulfide + H(+) <=> [DsrC protein]-S-sulfanyl-L-cysteine/L-cysteine
[dsrc protein]-disulfide + hydrogen sulfide + h(+) <=> [dsrc protein]-s-sulfanyl-l-cysteine/l-cysteine