Ariadne Genomics Inc. 3-sulfinyl pyruvate ---> pyruvate sulfide to sulfate oxidation sulfur dioxide ---> sulfate sulfur dioxide sulfate 3-sulfinyl pyruvate ---> sulfur dioxide pyruvate cysteinesulfinate ---> hypotaurine serine ---> cystathione cystathione ---> alpha-ketobutyrate cystathione ---> ammonium cystathione ---> cysteine Cbs, Cth non-specific reactions 3-sulfinyl pyruvate taurine hypotaurine cysteinesulfinate O2 cysteine hydrogen sulfide alpha-ketobutyrate ammonium cystathione PLP/B6 S-adenosylmethionine serine homocysteine glutathione biosynthesis O2 ---> cysteinesulfinate Cth hypotaurine ---> taurine Csad Cdo1 cysteine ---> hydrogen sulfide cysteine ---> glutathione biosynthesis hydrogen sulfide ---> sulfate cysteinesulfinate ---> 3-sulfinyl pyruvate homocysteine metabolic pathway methionine cycle/metabolic pathway S-adenosylmethionine --+> Cbs Cbs cysteine ---> cysteinesulfinate homocysteine ---> cystathione