Abstract
Background: Decaprenylphosphoryl-β-D-ribose epimerase (DprE1), a flavoprotein enzyme
engaged in the biosynthesis of decaprenylphosphoryl-β-D-arabinofuranose (DPA), is the only
contributor of arabinose residues which is fundamental for the mycobacterium cell wall constituents.
DprE1 is an interesting target for antitubercular agent and has been exploring to develop potential
chemical entities as antitubercular agents.
Objective: The objective of the study is the development of novel antitubercular agents targeting
Mtb Decaprenylphosphoryl-β-D-ribose epimerase (DprE1).
Methods: A series of isoxazole encompassed 1, 2, 4-triazoles were designed based on the antitubercular
potential of triazoles and structural features of DprE1 inhibitors. Designed 1, 2, 4-
triazoles were synthesized and characterized by spectral studies. The in vitro anti-TB activity of the
compounds was screened against Mycobacterium tuberculosis H37Rv strain by Microplate Almar
Blue Assay and in vitro cytotoxicity against normal cell lines by MTT assay. Molecular docking
study was carried out on DprE1 enzyme to understand designed compounds interactions with amino
acid residues at the active site.
Results: Antitubercular activity data revealed that eight compounds (6d, 6e,7d, 7e, 10d, 10e, 11d
and 11e) have shown promising antitubercular activity with minimum inhibitory concentration at
1.6μg/mL. Cytotoxicity data of anti-TB active compounds demonstrate good safety profile on
normal cell lines.
Conclusion: Eight compounds have shown promising antitubercular activity with good safety profile
on normal cell lines. Molecular docking study revealed that the synthesized compounds have
shown non-covalent interactions with amino acid residues of DprE1 enzyme.
Keywords:
Isoxazole, 1, 2, 4-triazole, Mtb H37Rv strain, MTT assay, DprE1 enzyme, antitubercular activity.
Graphical Abstract
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