Dynamics of subcellular tRNA trafficking in parasitic protist Trypanosoma brucei is guided by tRNA modifications and has a key role in proteosynthesis
We elucidated the formation and function of queuosine-tRNA modification (Q) in protein synthesis in the parasitic protist T. brucei, a causative agent of human sleeping sickness. Using molecular biology and biochemistry methods, we found that Q is crucial for codon selection, especially in the synthesis of mitochondrially encoded proteins. We demonstrate the dynamics of tRNA trafficking in T. brucei and its impact on the availability of tRNAs for protein synthesis and their modification status.
Collaborating subject: The Ohio State University, Columbus, Ohio, USA
Model of subcellular tRNA trafficking in parasitic protist Trypanosoma brucei
Queuosine tRNA modification is acquired in the nucleus by the heteromeric complex of tRNA guanine transglycosylase TbTGT1/2. After the nuclear export, the majority of the tRNA pool remains in the cytosol to participate in the translation of nuclear-encoded proteins. Due to the absence of mitochondrial tRNA genes and to maintain the organellar proteosynthesis, only the fully modified tRNAs are preferentially imported into the mitochondria of T. brucei.
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