O-phosphoseryl-tRNASec kinase (, PSTK, phosphoseryl-tRNA[Ser]Sec kinase, phosphoseryl-tRNASec kinase) is an enzyme with systematic name ATP:L-seryl-tRNASec O-phosphotransferase. This enzyme catalyses the following chemical reaction
ATP + L-seryl-tRNASec ADP + O-phospho-L-seryl-tRNASec
In archaea and eukarya selenocysteine formation is achieved by a two-step process.
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