Characterization of NUDIX hydrolase from Leishmania major

Area of Science:

• Biochemistry
• Molecular Biology
• Parasitology

Background:

• NUDIX hydrolases are essential enzymes involved in cleaving organic pyrophosphates across all life domains.
• They play critical roles in cellular metabolism and stress responses, utilizing a conserved NUDIX box domain.
• The function and localization of Nudix Hydrolase in Leishmania major concerning oxidatively damaged nucleotide removal were previously uncharacterized.

Purpose of the Study:

• To identify and characterize novel NUDIX hydrolases in the Leishmania major genome.
• To determine the cellular localization and enzymatic function of a specific NUDIX hydrolase, LmjF.31.2950 (LmNH).
• To investigate the role of LmNH in nucleotide metabolism and its potential anti-mutator function.

Main Methods:

• Bioinformatic analysis of the Leishmania major genome to identify proteins with NUDIX box domains and peroxisomal targeting sequences (PTS-1).
• Subcellular localization studies using GFP-fusion protein expression in Leishmania major.
• Complementation assays in mutT-deficient Escherichia coli to assess anti-mutator activity.

Main Results:

• Nine NUDIX box-containing proteins were identified in the Leishmania major genome.
• LmjF.31.2950 (LmNH) was found to possess NADH pyrophosphatase and PTS-1 motifs, localizing to microbody organelles (glycosomes).
• Proteomic analysis confirmed LmNH presence in glycosomes, and complementation assays validated its anti-mutator function.

Conclusions:

• LmjF.31.2950 (LmNH) is a novel, glycosome-targeted NUDIX hydrolase identified in Leishmania major.
• LmNH functions as an NADH pyrophosphatase, contributing to nucleotide metabolism within Leishmania major glycosomes.
• This characterization provides insights into the protective mechanisms against nucleotide damage in Leishmania major.