C55-isoprenyl pyrophosphate (also known as undecaprenyl pyrophosphate or C55-PP) is an essential molecule involved in the construction of the bacterial peptidoglycan cell wall.

[1] It is a receptor found in the plasma membrane of bacteria allowing glycan tetrapeptide monomers synthesized in the cell cytoplasm to translocate to the periplasmic space.

It is produced from C55-PP by reaction EC 3.6.1.27, typically catalyzed by UppP/BacA.

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