Information on EC - O-phospho-L-seryl-tRNA:Cys-tRNA synthase

for references in articles please use BRENDA:EC2.5.1.73
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In organisms like Archaeoglobus fulgidus lacking EC (cysteine---tRNA ligase) for the direct Cys-tRNACys formation, Cys-tRNACys is produced by an indirect pathway, in which EC (O-phosphoseryl-tRNA ligase) ligates O-phosphoserine to tRNACys, and EC converts the produced O-phospho-L-seryl-tRNACys to Cys-tRNACys. The SepRS/SepCysS pathway is the sole route for cysteine biosynthesis in the organism . Methanosarcina mazei can use both pathways, the direct route using EC (cysteine---tRNA ligase) and the indirect pathway with EC (O-phosphoseryl-tRNA ligase) and EC .
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The expected taxonomic range for this enzyme is: Archaea, Bacteria
MJ1678, Sep-tRNA-Cys-tRNA synthase, Sep-tRNA:Cys-tRNA synthase, SepCysS, more
O-phospho-L-seryl-tRNACys + sulfide = L-cysteinyl-tRNACys + phosphate
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