ID 2.7.1.164 DE O-phosphoseryl-tRNA(Sec) kinase. AN L-seryl-tRNA(Sec) kinase. AN PSTK. CA ATP + L-seryl-tRNA(Sec) = ADP + O-phospho-L-seryl-tRNA(Sec). CC -!- In archaea and eukarya selenocysteine formation is achieved by a two- CC step process: O-phosphoseryl-tRNA(Sec) kinase (PSTK) phosphorylates CC the endogenous L-seryl-tRNA(Sec) to O-phospho-L-seryl-tRNA(Sec), CC and then this misacylated amino acid-tRNA species is converted to CC L-selenocysteinyl-tRNA(Sec) by EC 2.9.1.2. CC -!- Formerly EC 2.7.1.n3. DR Q8IV42, PSTK_HUMAN ; Q58933, PSTK_METJA ; Q8TUS5, PSTK_METKA ; DR Q6LX62, PSTK_METMP ; Q8BP74, PSTK_MOUSE ; //