tRNA(Cys) + O-phospho-L-serine + ATP = O-phospho-L-seryl-tRNA(Cys) + AMP + diphosphate
trna(cys) + o-phospho-l-serine + atp = o-phospho-l-seryl-trna(cys) + amp + diphosphate
"O-phosphoserine--tRNA ligase"
"o-phosphoserine--trna ligase"