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• W2440245506 endingPage "257" @default.
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• W2440245506 abstract "The MraY transferase catalyzes the first membrane step of bacterial cell wall peptidoglycan biosynthesis, namely the transfer of the N-acetylmuramoyl-pentapeptide moiety of the cytoplasmic precursor UDP-MurNAc-pentapeptide to the membrane transporter undecaprenyl phosphate (C55P), yielding C55-PP-MurNAc-pentapeptide (lipid I). A paralogue of MraY, WecA, catalyzes the transfer of the phospho-GlcNAc moiety of UDP-N-acetylglucosamine onto the same lipid carrier, leading to the formation of C55-PP-GlcNAc that is essential for the synthesis of various bacterial cell envelope components. These two enzymes are members of the polyprenyl-phosphate N-acetylhexosamine 1-phosphate transferase superfamily, which are essential for bacterial envelope biogenesis. Despite the availability of detailed biochemical information on the MraY enzyme, and the recently published crystal structure of MraY of Aquifex aeolicus, the molecular basis for its catalysis remains poorly understood. This knowledge can contribute to the design of potential inhibitors. Here, we report a detailed catalytic study of the Bacillus subtilis MraY and Thermotoga maritima WecA transferases. Both forward and reverse exchange reactions required the presence of the second substrate, C55P and uridine monophosphate (UMP), respectively. Both enzymes did not display any pyrophosphatase activity on the nucleotide substrate. Moreover, we showed that the nucleotide substrate UDP-MurNAc-pentapeptide, as well as the nucleotide product UMP, can bind to MraY in the absence of lipid ligands. Therefore, our data are in favour of a single displacement mechanism. During this “one-step” mechanism, the oxyanion of the polyprenyl-phosphate attacks the β-phosphate of the nucleotide substrate, leading to the formation of lipid product and the liberation of UMP. The involvement of an invariant aspartyl residue in the deprotonation of the lipid substrate is discussed." @default.
• W2440245506 created "2016-06-24" @default.
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• W2440245506 date "2016-08-01" @default.
• W2440245506 modified "2023-10-07" @default.
• W2440245506 title "Catalytic mechanism of MraY and WecA, two paralogues of the polyprenyl-phosphate N-acetylhexosamine 1-phosphate transferase superfamily" @default.
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• W2440245506 doi "https://doi.org/10.1016/j.biochi.2016.06.005" @default.
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