Kinetoplastid glucose transporters

Area of Science:

• Parasitology
• Molecular Biology
• Biochemistry

Background:

• Kinetoplastida are protozoa with diverse habitats, including human parasites.
• Cellular adaptation, particularly at the plasma membrane, is crucial for environmental survival.
• Sugar transport mechanisms in kinetoplastids provide a model for studying carrier protein evolution.

Purpose of the Study:

• To investigate the evolution of glucose transporter proteins in kinetoplastid parasites.
• To understand how these transporters adapt to different environmental glucose concentrations.
• To characterize the substrate specificity and inhibition patterns of kinetoplastid sugar transporters.

Main Methods:

• Cloning of seven genes encoding glucose transport proteins from various kinetoplastid species.
• Comparative analysis of transporter sequences and functions.
• Assessment of substrate specificity (glucose, fructose) and inhibitor sensitivity (cytochalasin B, phloretin).

Main Results:

• Seven kinetoplastid glucose transporter genes were identified, belonging to the glucose transporter superfamily.
• Trypanosoma brucei utilizes two transporters for fluctuating glucose levels, while Trypanosoma cruzi has one high-affinity transporter for glucose-poor environments.
• All identified transporters transport d-fructose and are insensitive to cytochalasin B and phloretin.

Conclusions:

• Kinetoplastid parasites exhibit specialized sugar transporter systems reflecting their adaptation to distinct ecological niches.
• The evolution of these transporters is key to parasite survival in diverse hosts and environments.
• Kinetoplastid transporters represent a unique class within the glucose transporter superfamily.