Download MendeleyStructure of the essential peptidoglycan amidotransferase MurT/GatD complex from Streptococcus pneumoniae.
Morlot, C., Straume, D., Peters, K., Hegnar, O.A., Simon, N., Villard, A.M., Contreras-Martel, C., Leisico, F., Breukink, E., Gravier-Pelletier, C., Le Corre, L., Vollmer, W., Pietrancosta, N., Havarstein, L.S., Zapun, A.(2018) Nat Commun 9: 3180-3180
- PubMed: 30093673
- DOI: https://doi.org/10.1038/s41467-018-05602-w
- Primary Citation of Related Structures:
6FQB - PubMed Abstract:
The universality of peptidoglycan in bacteria underlies the broad spectrum of many successful antibiotics. However, in our times of widespread resistance, the diversity of peptidoglycan modifications offers a variety of new antibacterials targets. In some Gram-positive species such as Streptococcus pneumoniae, Staphylococcus aureus, or Mycobacterium tuberculosis, the second residue of the peptidoglycan precursor, D-glutamate, is amidated into iso-D-glutamine by the essential amidotransferase MurT/GatD complex. Here, we present the structure of this complex at 3.0 Å resolution. MurT has central and C-terminal domains similar to Mur ligases with a cysteine-rich insertion, which probably binds zinc, contributing to the interface with GatD. The mechanism of amidation by MurT is likely similar to the condensation catalyzed by Mur ligases. GatD is a glutaminase providing ammonia that is likely channeled to the MurT active site through a cavity network. The structure and assay presented here constitute a knowledge base for future drug development studies.
Organizational Affiliation:
Université Grenoble Alpes, CNRS, CEA, IBS UMR 5075, 38044, Grenoble, France.
