UDP-glucose pyrophosphorylase is a common plant enzyme and plays a key role in many processes connected with carbohydrates metabolism in plant tissues. This enzyme catalyse the reversible reaction of synthesis/degradation of UDP-glucose and inorganic pyrophosphate from glucose-1-phosphate and UTP. UDP-glucose is the precursor of many carbohydrates like sucrose, starch, pectin, cellulose. The second product of UGPase activity is PPi, the alternative to ATP energy donor which supply Pi. The highest activity of UGPase was observed in cytosol.

The extracellular concentration of protons is much higher than intracellular its level. Responsi- ble for generation and maintaining this difference is the proton pump (H+) present in the outer cell membrane. A proton pump uses ATP as a substrate and expels H+ from the cell; consequently, the ions are asymmetrically located and the electrochemical gradient appears, which is used in many physiological processes such as cellular growth, osmoregulation and transport of substances into the cell.

Due to the great genetic and physiological variability bacteria are able to colonize diffe- rent ecological niches and rapidly adapt to the changing environmental conditions. Bacterial qu- orum sensing system (QS) represents one of the important mechanisms allowing bacterial cells to regulate physiological activities on the global, highly synchronized level. This system is defined as a method of intra- and interspecies communication of bacterial cells.