Related Experiment Video
Updated: Mar 27, 2026
Using Fluorescent Proteins to Monitor Glycosome Dynamics in the African Trypanosome
Published on: August 19, 2014
Characterization of the interaction between Trypanosoma brucei Pex5p and its receptor Pex14p
Yuichi Watanabe1, Kosuke Kawaguchi1, Naoki Okuyama1
1Department of Biological Chemistry, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Sugitani, Japan.
Abstract:
The interaction of Trypanosoma brucei (Tb) Pex5p and its receptor TbPex14p is essential for the translocation of newly synthesized matrix proteins into the glycosome. Here, we reveal that only the third WXXXF/Y motif of TbPex5p is involved in the interaction and that negative charge of the fourth amino acid is important. We suggest that Phe35 and Phe52 of TbPex14p interact with Trp318 and Phe322 in the third motif and that the Lys56 adjacent to Phe35/Phe52 associates with the fourth Glu in the motif to make the complex. This information is expected to be useful for developing anti-trypanosomal drugs.
Insights
The interaction between Trypanosoma brucei Pex5p and TbPex14p is key for protein transport into glycosomes. Specific motifs and charged amino acids mediate this crucial interaction for potential anti-trypanosomal drug development.
Area of Science:
- Molecular Biology
- Parasitology
- Drug Discovery
Background:
- The interaction between Trypanosoma brucei (Tb) Pex5p and its receptor TbPex14p is critical for protein import into the glycosome.
- Glycosomal protein translocation is essential for the survival and proliferation of the parasite.
Purpose of the Study:
- To elucidate the specific molecular interactions between TbPex5p and TbPex14p.
- To identify the key motifs and amino acid residues involved in this protein-protein interaction.
- To provide insights for the development of novel anti-trypanosomal therapeutic strategies.
Main Methods:
- Analysis of the third WXXXF/Y motif of TbPex5p.
- Investigation of the role of charged amino acids within the motif.
- Structural modeling to predict interactions between TbPex5p and TbPex14p.
Main Results:
- Only the third WXXXF/Y motif of TbPex5p is essential for binding to TbPex14p.
- A negative charge at the fourth position of the motif is crucial for the interaction.
- Specific phenylalanine and tryptophan residues in TbPex14p interact with the third motif, with adjacent lysine potentially binding the charged amino acid.
Conclusions:
- The study precisely defines the interaction interface between TbPex5p and TbPex14p.
- Understanding these molecular details is vital for designing drugs targeting glycosomal protein import in Trypanosoma brucei.
- This knowledge facilitates the development of new anti-parasitic agents against African trypanosomiasis.
