7AGO image
Entry Detail
PDB ID:
7AGO
Title:
crystal structure of the N-acetylmuramyl-L-alanine amidase, Ami1, from Mycobacterium abscessus bound to L-Alanine-D-isoglutamine
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2020-09-23
Release Date:
2020-11-18
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.18
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:N-acetylmuramoyl-L-alanine amidase
Chain IDs:A
Chain Length:233
Number of Molecules:1
Biological Source:Mycobacteroides abscessus
Primary Citation
Functional Characterization of the N -Acetylmuramyl-l-Alanine Amidase, Ami1, from Mycobacterium abscessus .
Cells 9 ? ? (2020)
PMID: 33158165 DOI: 10.3390/cells9112410

Abstact

Peptidoglycan (PG) is made of a polymer of disaccharides organized as a three-dimensional mesh-like network connected together by peptidic cross-links. PG is a dynamic structure that is essential for resistance to environmental stressors. Remodeling of PG occurs throughout the bacterial life cycle, particularly during bacterial division and separation into daughter cells. Numerous autolysins with various substrate specificities participate in PG remodeling. Expression of these enzymes must be tightly regulated, as an excess of hydrolytic activity can be detrimental for the bacteria. In non-tuberculous mycobacteria such as Mycobacterium abscessus, the function of PG-modifying enzymes has been poorly investigated. In this study, we characterized the function of the PG amidase, Ami1 from M. abscessus. An ami1 deletion mutant was generated and the phenotypes of the mutant were evaluated with respect to susceptibility to antibiotics and virulence in human macrophages and zebrafish. The capacity of purified Ami1 to hydrolyze muramyl-dipeptide was demonstrated in vitro. In addition, the screening of a 9200 compounds library led to the selection of three compounds inhibiting Ami1 in vitro. We also report the structural characterization of Ami1 which, combined with in silico docking studies, allows us to propose a mode of action for these inhibitors.

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