Leishmania thiol metabolism enzyme

Leishmania thiol metabolism enzymes comprise a set of enzymes unique to trypanosomatid parasites, including trypanothione synthetase, trypanothione reductase, tryparedoxin, tryparedoxin peroxidase, and related enzymes involved in the synthesis and recycling of trypanothione—a trypanosomatid-specific low-molecular-weight thiol. These enzymes maintain redox homeostasis and defend against oxidative stress generated by the host immune response and drugs[1][2][3][4][5]. Trypanothione reductase, in particular, is responsible for keeping trypanothione in its reduced state using NADPH and is considered a validated drug target due to its essential role and absence in humans[1][4][6]. Related enzymes like TDR1 facilitate the activation of key antiparasitic drugs, and alterations in thiol metabolism bolster parasite survival and drug resistance mechanisms[5][3]. Because these enzymes are fundamental to parasite viability and not present in human cells, they serve as attractive and specific targets for antileishmanial drug development[4][1]. Note: This entry is marked as incorrect/ambiguous (`is_incorrect: true`) because "Leishmania spp. thiol metabolism enzymes" is not a single, specific molecular entity but rather a family/group of related enzymes. Each component (e.g., trypanothione reductase, tryparedoxin peroxidase) is a distinct and separately-druggable target. For structured data, these should preferably be split into their respective, explicit canonical enzyme names when possible.

Other names

Trypanothione pathway enzymeTrypanothione reductase (TR)Tryparedoxin peroxidase (TXNPx)Tryparedoxin (TXN)Cysteine synthase (CS)TDR1Glutathione-S-transferase-like enzyme

Inhibition of trypanothione reductase blocks the reduction of trypanothione disulfide, leading to accumulation of reactive oxygen species and parasite death[4][1]. Antimonial prodrugs are activated by TDR1-mediated deglutathionylation, converting inactive Sb(V) to active Sb(III)[5]. Induction of ROS-mediated apoptosis by interfering with thiol-based antioxidant mechanisms[4].