Colicin M hydrolyses branched lipids II from Gram-positive bacteria
摘要:
Lipids II found in some Gram-positive bacteria were prepared in radioactive form from L-lysine-containing UDP-MurNAc-pentapeptide. The specific lateral chains of Enterococcus faecalis, Enterococcus faecium and Staphylococcus aureus (di-L-alanine, D-isoasparagine, and pentaglycine, respectively) were introduced by chemical peptide synthesis using the Fmoc chemistry. The branched nucleotides obtained were converted into the corresponding lipids II by enzymatic synthesis using the MraY and MurG enzymes. All of the lipids were hydrolysed by Escherichia coli colicin M at approximately the same rate as the meso-diaminopimelate-containing lipid II found in Gram-negative bacteria, thereby opening the way to the use of this enzyme as a broad spectrum antibacterial agent. (C) 2012 Elsevier Masson SAS. All rights reserved.
selectivity. The squaramate‐RNAs specifically reacted with the lysine of UDP‐MurNAc‐pentapeptide, a peptidoglycan precursor used by the aminoacyl‐transferase FemXWv for synthesis of the bacterial cell wall. The peptidyl‐RNA obtained with squaramate‐RNA and unprotected UDP‐MurNAc‐pentapeptide efficiently inhibited FemXWv. The squaramate unit also promoted specific cross‐linking of RNA to the catalytic Lys
作者:Lin-Ya Huang、Shih-Hsien Huang、Ya-Chih Chang、Wei-Chieh Cheng、Ting-Jen R. Cheng、Chi-Huey Wong
DOI:10.1002/anie.201402313
日期:2014.7.28
polymerizes lipid II into peptidoglycan and is one of the most favorable targets because of its vital role in peptidoglycan synthesis. Described in this study is a practical enzymatic method for the synthesis of lipid II, coupled with cofactor regeneration, to give the product in a 50–70 % yield. This development depends on two key steps: the overexpression of MraY for the synthesis of lipid I and the
Chemoenzymatic syntheses of water-soluble lipid I fluorescent probes
作者:Katsuhiko Mitachi、Shajila Siricilla、Lada Klaić、William M. Clemons、Michio Kurosu
DOI:10.1016/j.tetlet.2015.01.044
日期:2015.6
requirements of the prenyl phosphates in MraY-catalyzed lipid I synthesis, we found that (2Z,6E)-farnesyl phosphate (C15-phosphate) can be recognized by Escherichia coli MraY to generate the water-soluble lipid I fluorescent probe in high-yields. Under the optimized conditions, the same reaction was performed by using the purified MraY from Hydrogenivirga spp. to afford the lipid I analog with high-yields