UppP (EC 3.6.1.27) performs the reaction:
This activity is enhanced by divalent cations like Ca²⁺ . In Rhizobium leguminosarum, UppP contributes to:
Peptidoglycan biosynthesis: Recycling undecaprenyl phosphate for cell wall assembly .
Bacitracin resistance: Bacitracin binds undecaprenyl diphosphate, and UppP activity counteracts this inhibition .
Antibiotic Resistance Studies: UppP’s role in bacitracin resistance makes it a target for antimicrobial strategies .
Enzyme Kinetics: Used to study divalent cation dependence and substrate specificity .
Symbiotic Function: R. leguminosarum UppP may influence nodulation efficiency in legumes by modulating cell envelope integrity .
Plasmid Rearrangement: In R. leguminosarum bv. viciae VF39, symbiotic plasmid (pSym) rearrangements alter uppP localization, affecting bacterial adaptability .
Transcriptional Regulation: Deletion of plasmid pRleVF39b in R. leguminosarum increases uppP expression by 4-fold, suggesting plasmid-mediated repression .
EPS Biosynthesis Link: UppP activity indirectly affects exopolysaccharide (EPS) production via UDP-glucose pool modulation .
KEGG: rle:RL0328
STRING: 216596.RL0328