O-phosphoseryl-tRNASec kinase

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 $$\rightleftharpoons$$ ADP + O-phospho-L-seryl-tRNASec

In archaea and eukarya selenocysteine formation is achieved by a two-step process.