PSTK Tarakan Players
O-phosphoseryl-tRNASec kinase (, ''PSTK'', ''phosphoseryl-tRNA erec 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 Selenocysteine (symbol Sec or U, in older publications also as Se-Cys) is the 21st proteinogenic amino acid. Selenoproteins contain selenocysteine residues. Selenocysteine is an analogue of the more common cysteine with selenium in place of the s ... formation is achieved by a two-step process. References External links * {{Portal bar, Biology, border=no EC 2.7.1 ...
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Enzyme
Enzymes () are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products. Almost all metabolic processes in the cell need enzyme catalysis in order to occur at rates fast enough to sustain life. Metabolic pathways depend upon enzymes to catalyze individual steps. The study of enzymes is called ''enzymology'' and the field of pseudoenzyme analysis recognizes that during evolution, some enzymes have lost the ability to carry out biological catalysis, which is often reflected in their amino acid sequences and unusual 'pseudocatalytic' properties. Enzymes are known to catalyze more than 5,000 biochemical reaction types. Other biocatalysts are catalytic RNA molecules, called ribozymes. Enzymes' specificity comes from their unique three-dimensional structures. Like all catalysts, enzymes increase the reaction ra ...
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