EC Number |
Substrates |
Organism |
Products |
Reversibility |
---|
2.7.1.164 | ATP + L-seryl-tRNASec |
- |
Trypanosoma brucei |
ADP + O-phospho-L-seryl-tRNASec |
- |
? |
2.7.1.164 | ATP + L-seryl-tRNASec |
- |
Leishmania donovani |
ADP + O-phospho-L-seryl-tRNASec |
- |
? |
2.7.1.164 | ATP + L-seryl-tRNASec |
- |
Methanocaldococcus jannaschii |
ADP + O-phospho-L-seryl-tRNASec |
- |
? |
2.7.1.164 | ATP + L-seryl-tRNASec |
- |
Trypanosoma brucei brucei |
ADP + O-phospho-L-seryl-tRNASec |
- |
? |
2.7.1.164 | ATP + L-seryl-tRNASec |
L-phosphoseryl-tRNA is the crucial precursor for L-selenocysteinyl-tRNA formation in archaea and eukarya. Selenocysteine formation is achieved by a two-step process: O-phosphoseryl-tRNASec kinase (PSTK) phosphorylates the endogenous Ser-tRNASec to O-phosphoseryl-tRNASec, and then this misacylated amino acid-tRNA species is converted to L-selenocysteinyl-tRNASec by Sep-tRNA:Sec-tRNA synthase (SepSecS) |
Methanocaldococcus jannaschii |
ADP + O-phospho-L-seryl-tRNASec |
- |
? |
2.7.1.164 | ATP + L-seryl-tRNASec |
null mutants of PSTK abolish selenoprotein synthesis, demonstrating the essentiality of the enzyme for the formation of L-selenocysteinyl-tRNASec. Growth of the knockout strain is not impaired. Thus, unlike mammals, trypanosomes do not require selenoproteins for viability |
Trypanosoma brucei |
ADP + O-phospho-L-seryl-tRNASec |
- |
? |
2.7.1.164 | ATP + L-seryl-tRNASec |
Pstk is a limiting factor for hepatic selenoprotein biosynthesis, and its mRNA expression is most strongly affected during the lipopolysaccharide (LPS)-induced acute-phase response |
Mus musculus |
ADP + O-phospho-L-seryl-tRNASec |
- |
? |
2.7.1.164 | ATP + L-seryl-tRNASec |
about 30% of O-phospho-L-seryltRNA[Ser]Sec is converted to L-seryl-tRNA[Ser]Sec and ATP during the course of the reaction. The kinase is specific for the two major isoforms of O-phospho-L-seryl-tRNA[Ser]Sec. Seryl-tRNA1Ser does not serve as a substrate for PSTK |
Mus musculus |
ADP + O-phospho-L-seryl-tRNASec |
- |
r |
2.7.1.164 | ATP + L-seryl-tRNASec |
the enzyme does not recognize free Ser as a substrate for phosphate transfer. Ser attached to tRNASec is its obligate substrate. Neither tRNASer nor L-seryl-tRNASer is a substrate for phosphorylation |
Methanocaldococcus jannaschii |
ADP + O-phospho-L-seryl-tRNASec |
- |
? |
2.7.1.164 | ATP + L-seryl-tRNASec |
- |
Methanocaldococcus jannaschii DSM 2661 |
ADP + O-phospho-L-seryl-tRNASec |
- |
? |