5E5L

Crystal structure of Mycobacterium tuberculosis L,D-transpeptidase 1 at 1.89 Angstrom

Summary for 5E5L

• Entry DOI: 10.2210/pdb5e5l/pdb
• Related: 5DU7 5DUJ 5DVP 5DVQ 5DWT 5DZJ 5DZP 5E1G 5E1I 5E51
• Descriptor: L,D-transpeptidase 1 (2 entities in total)
• Functional Keywords: peptidoglycan synthesis enzyme, cell wall enzyme, transferase
• Biological source: Mycobacterium tuberculosis
• Cellular location: Periplasm : O53638
• Total number of polymer chains: 4
• Total formula weight: 95867.86

Authors

Kumar, P.,Lamichhane, G.,Ginell, S.L. (deposition date: 2015-10-08, release date: 2016-10-26, Last modification date: 2024-03-06)

Primary citation

Kumar, P.,Kaushik, A.,Lloyd, E.P.,Li, S.G.,Mattoo, R.,Ammerman, N.C.,Bell, D.T.,Perryman, A.L.,Zandi, T.A.,Ekins, S.,Ginell, S.L.,Townsend, C.A.,Freundlich, J.S.,Lamichhane, G.
Non-classical transpeptidases yield insight into new antibacterials.
Nat. Chem. Biol., 13:54-61, 2017

PubMed Abstract: Bacterial survival requires an intact peptidoglycan layer, a three-dimensional exoskeleton that encapsulates the cytoplasmic membrane. Historically, the final steps of peptidoglycan synthesis are known to be carried out by D,D-transpeptidases, enzymes that are inhibited by the β-lactams, which constitute >50% of all antibacterials in clinical use. Here, we show that the carbapenem subclass of β-lactams are distinctly effective not only because they inhibit D,D-transpeptidases and are poor substrates for β-lactamases, but primarily because they also inhibit non-classical transpeptidases, namely the L,D-transpeptidases, which generate the majority of linkages in the peptidoglycan of mycobacteria. We have characterized the molecular mechanisms responsible for inhibition of L,D-transpeptidases of Mycobacterium tuberculosis and a range of bacteria including ESKAPE pathogens, and used this information to design, synthesize and test simplified carbapenems with potent antibacterial activity.

PubMed: 27820797
DOI: 10.1038/nchembio.2237

Experimental method

X-RAY DIFFRACTION (1.89 Å)