O-phospho-L-seryl-tRNASec:L-selenocysteinyl-tRNA synthase (EC2.9.1.2, MMPSepSecS, SepSecS, SLA/LP, O-phosphoseryl-tRNA:selenocysteinyl-tRNA synthase, O-phospho-L-seryl-tRNA:L-selenocysteinyl-tRNA synthase) is an enzyme with systematic nameselenophosphate:O-phospho-L-seryl-tRNASec selenium transferase.[1][2][3][4] This enzyme catalyses the following chemical reaction