Phosphotransferase System
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. In the case of glucose, the product of this phosphorylation is Glucose-6-Phosphate (Glu-6P). Due to the negative charge of the phosphate, this Glu-6P can no longer freely leave the cell. This is the first reaction of glycolysis, which degrades the sugar to pyruvate.
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