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PEP (phosphoenol pyruvate) group translocation, also known as the phosphotransferase system or PTS, is a distinct method used by bacteria for sugar uptake where the source of energy is from phosphoenolpyruvate (PEP). It is known to be a multicomponent system that always involves enzymes of the plasma membrane and those in the cytoplasm.
The phosphotransferase system (PTS) is a complex group translocation system present in many bacteria. The PTS transports sugars (such as glucose , mannose , and mannitol ) into the cell. The first step of this reaction is phosphorylation of the substrate via phosphotransferase during transport.
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Phosphoenolpyruvate (2-phosphoenolpyruvate, PEP) is the carboxylic acid derived from the enol of pyruvate and phosphate. It exists as an anion. PEP is an important intermediate in biochemistry. It has the highest-energy phosphate bond found (−61.9 kJ/mol) in organisms, and is involved in glycolysis and gluconeogenesis.
P i = phosphate group. E-His = histidine residue of the enzyme. E-His = histidine residue of the enzyme. Pyruvate, phosphate dikinase , or PPDK ( EC 2.7.9.1 ) is an enzyme in the family of transferases that catalyzes the chemical reaction
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Phosphoenolpyruvate carboxykinase (EC 4.1.1.32, PEPCK) is an enzyme in the lyase family used in the metabolic pathway of gluconeogenesis. It converts oxaloacetate into phosphoenolpyruvate and carbon dioxide .
The genes regulated by CRP are mostly involved in energy metabolism, such as galactose, citrate, or the PEP group translocation system. [3] [4] In Escherichia coli, CRP can regulate the transcription of more than 100 genes. [5] The signal to activate CRP is the binding of cyclic AMP.