8g6p

Publication Abstract from PubMed

The cytoplasmatic biosynthesis of the stem peptide from the peptidoglycan in bacteria involves six steps, which have the role of three ATP-dependent Mur ligases that incorporate three consecutive amino acids to a substrate precursor. MurE is the last Mur ligase to incorporate a free amino acid. Although the structure of MurE from Mycobacterium tuberculosis (MtbMurE) was determined at 3.0 A, the binding mode of meso-Diaminopimelate (m-DAP) and the effect of substrate absence is unknown. Herein, we show the structure of MurE from M. thermoresistibile (MthMurE) in complex with ADP and m-DAP at 1.4 A resolution. The analysis of the structure indicates key conformational changes that the substrate UDP-MurNAc-L-Ala-D-Glu (UAG) and the free amino acid m-DAP cause on the MthMurE conformation. We observed several movements of domains or loop regions that displace their position in order to perform enzymatic catalysis. Since MthMurE has a high similarity to MtbMurE, this enzyme could also guide strategies for structure-based antimicrobial discovery to fight against tuberculosis or other mycobacterial infections.

The crystal structure of Mycobacterium thermoresistibile MurE ligase reveals the binding mode of the substrate m-diaminopimelate.,Rossini NO, Silva C, Dias MVB J Struct Biol. 2023 Mar 20;215(2):107957. doi: 10.1016/j.jsb.2023.107957. PMID:36944394^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.