Journal
PARASITOLOGY
Volume 149, Issue 3, Pages 356-370Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S003118202100189X
Keywords
mRNA decay; RNA-binding protein; translation; Trypanosoma brucei
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Funding
- Deutsche Forschungsgemeinschaft [Cl112/28-1]
- state of Baden-Wurttemberg
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In Trypanosoma brucei, ZC3H28 protein plays a vital role in stabilizing specific mRNAs and increasing protein levels. Mass spectrometry revealed that ZC3H28 is associated with ribosomal proteins, various RNA-binding proteins, and is involved in regulating long and poorly translated mRNAs.
In Trypanosoma brucei and related Kinetoplastids, regulation of gene expression occurs mostly post-transcriptionally, and RNA-binding proteins play a critical role in the regulation of mRNA and protein abundance. Trypanosoma brucei ZC3H28 is a 114 KDa cytoplasmic mRNA-binding protein with a single C(x)(7)C(x)(5)C(x)(s)H zinc finger at the C-terminus and numerous proline-, histidine- or glutamine-rich regions. ZC3H28 is essential for normal bloodstream-form trypanosome growth, and when tethered to a reporter mRNA, ZC3H28 increased reporter mRNA and protein levels. Purification of N-terminally tagged ZC3H28 followed by mass spectrometry showed enrichment of ribosomal proteins, various RNA-binding proteins including both poly(A) binding proteins, the translation initiation complex EIF4E4/EIF4G3, and the activator MKT1. Tagged ZC3H28 was preferentially associated with long RNAs that have low complexity sequences in their 3'-untranslated regions; their coding regions also have low ribosome densities. In agreement with the tethering results, after ZC3H28 depletion, the levels of a significant proportion of its bound mRNAs decreased. We suggest that ZC3H28 is implicated in the stabilization of long mRNAs that are poorly translated.
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