Critical Impact of Peptidoglycan Precursor Amidation on the Activity of<scp>l,d</scp>-Transpeptidases from<i>Enterococcus faecium</i>and<i>Mycobacterium tuberculosis</i>
作者:Flora Ngadjeua、Emmanuelle Braud、Saidbakhrom Saidjalolov、Laura Iannazzo、Dirk Schnappinger、Sabine Ehrt、Jean-Emmanuel Hugonnet、Dominique Mengin-Lecreulx、Delphine Patin、Mélanie Ethève-Quelquejeu、Matthieu Fonvielle、Michel Arthur
DOI:10.1002/chem.201706082
日期:2018.4.17
The bacterial cell wall peptidoglycan contains unusual l‐ and d‐amino acids assembled as branched peptides. Insight into the biosynthesis of the polymer has been hampered by limited access to substrates and to suitable polymerization assays. Here we report the full synthesis of the peptide stem of peptidoglycan precursors from two pathogenic bacteria, Enterococcus faecium and Mycobacterium tuberculosis
细菌细胞壁肽聚糖含有组装成分支肽的不寻常的l和d氨基酸。由于难以接近底物和进行适当的聚合测定,阻碍了对聚合物生物合成的了解。在这里,我们报告了由两种病原细菌粪肠球菌和结核分枝杆菌的肽聚糖前体的肽茎的完整合成,以及通过l,d进行灵敏的衍生化后化合测定的发展转肽酶。访问系列干的肽表明游离羧基的酰胺化即是最佳酶活性必需的,特别是二氨基庚二酸(DAP)的酰胺化了的交联活性的残基L,d -transpeptidase LDT MT2从结核分枝杆菌。因此,条件突变体的构建确立了AsnB的重要作用,表明该DAP酰胺基转移酶是抗分枝杆菌药物开发的有吸引力的靶标。