Functional Characterization of the N-Acetylmuramyl-l-Alanine Amidase, Ami1, from Mycobacterium abscessus
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Functional Characterization of the N-Acetylmuramyl-l-Alanine Amidase, Ami1, from Mycobacterium abscessus. / Küssau, Tanja; Van Wyk, Niël; Johansen, Matt D.; Alsarraf, Husam M.A.B.; Neyret, Aymeric; Hamela, Claire; Sørensen, Kasper K.; Thygesen, Mikkel B.; Beauvineau, Claire; Kremer, Laurent; Blaise, Mickaël.
I: Cells, Bind 9, Nr. 11, 2410, 04.11.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Functional Characterization of the N-Acetylmuramyl-l-Alanine Amidase, Ami1, from Mycobacterium abscessus
AU - Küssau, Tanja
AU - Van Wyk, Niël
AU - Johansen, Matt D.
AU - Alsarraf, Husam M.A.B.
AU - Neyret, Aymeric
AU - Hamela, Claire
AU - Sørensen, Kasper K.
AU - Thygesen, Mikkel B.
AU - Beauvineau, Claire
AU - Kremer, Laurent
AU - Blaise, Mickaël
PY - 2020/11/4
Y1 - 2020/11/4
N2 - 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.
AB - 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.
KW - drug screening
KW - Mycobacterium abscessus
KW - N-acetylmuramyl-l-alanine amidase
KW - peptidoglycan
KW - x-ray crystallography
U2 - 10.3390/cells9112410
DO - 10.3390/cells9112410
M3 - Journal article
C2 - 33158165
AN - SCOPUS:85095801008
VL - 9
JO - Cells
JF - Cells
SN - 2073-4409
IS - 11
M1 - 2410
ER -
ID: 260401567