Reaction catalyzed by O-phospho-L-seryl-tRNA:Cys-tRNA synthase (2.5.1.73)
+
sulfide
=
L-cysteinyl-tRNASec
+
O-phospho-L-seryl-tRNASec
+
sulfide
=
L-cysteinyl-tRNASec
+
phosphate