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Phospho-N-acetylmuramoyl-pentapeptide-transferase (mraY) is an enzyme responsible for the formation of the first lipid intermediate in the synthesis of bacterial cell wall peptidoglycan. It catalyzes the formation of undecaprenyl-pyrophosphoryl-N-acetylmuramoyl-pentapeptide from UDP-MurNAc-pentapeptide and undecaprenyl-phosphate. It is an integral membrane protein with possibly ten transmembrane domains.