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A comparative analysis of trypanosomatid SNARE proteins
Edwin Murungi1, Lael D Barlow2, Divya Venkatesh3
1South African National Bioinformatics Institute, University of the Western Cape, Private Bag X17, Bellville 7535, Cape Town, South Africa.
Parasitology International
|November 26, 2013
Summary
The study reveals that Soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) are remarkably stable in pathogenic trypanosomatids. Differential expression of SNAREs in Trypanosoma brucei suggests adaptation to different host environments.
Area of Science:
- * Molecular Biology
- * Parasitology
- * Evolutionary Biology
Background:
- * Kinetoplastida, including trypanosomatids like Trypanosoma brucei, Trypanosoma cruzi, and Leishmania spp., are flagellated protozoa that cause significant human and livestock diseases.
- * Intracellular trafficking, mediated by Soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs), is crucial for pathogen survival and host interaction.
- * Understanding SNARE evolution and function in these parasites is vital for developing therapeutic strategies.
Purpose of the Study:
- * To investigate the evolutionary history and complement of SNAREs in pathogenic trypanosomatids.
- * To analyze the expression patterns and subcellular localization of SNAREs in Trypanosoma brucei.
- * To compare trypanosomatid SNAREs with those found in yeast and humans.
Main Methods:
- * In silico analysis of predicted proteomes from T. b. brucei and T. cruzi to identify SNARE sequences.
- * Phylogenetic analysis to classify trypanosomatid SNAREs and identify orthologs in other eukaryotes.
- * Expression analysis of T. brucei SNAREs in different life stages and subcellular localization studies.
Main Results:
- * Trypanosomatids possess a stable SNARE complement, with limited variation in number and identity across species (e.g., Leishmania major has 27, T. brucei has 26).
- * Significant differential expression of SNAREs, particularly R and Qb-SNARE subclasses, was observed between mammalian and insect forms of T. brucei, indicating environmental adaptation.
- * Conserved SNAREs in trypanosomes, such as TbVAMP7C, TbSyn5, and TbSyn16B, showed conserved subcellular localization (endosomal and Golgi complex) similar to yeast and human orthologs.
Conclusions:
- * The SNARE complement in pathogenic trypanosomatids was largely established in their last common ancestor and has remained stable.
- * Trypanosomes modulate SNARE function through differential gene expression, facilitating adaptation to distinct host environments.
- * Conserved SNAREs maintain similar localization and potentially function across eukaryotic lineages, highlighting evolutionary conservation.
