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Updated: Aug 3, 2026

Polysome Fractionation and Analysis of Mammalian Translatomes on a Genome-wide Scale
Published on: May 17, 2014
Stage-specific translational efficiency and protein stability regulate the developmental expression of p37, an RNA
Jinlei Li1, William T Ruyechan, Noreen Williams
1Department of Microbiology and Witebsky Center for Microbial Pathogenesis and Immunology, 253 Biomedical Research Building, State University of New York at Buffalo, Buffalo, NY 14214, USA.
Abstract:
We have previously characterized two novel RNA binding proteins, p34 and p37, from Trypanosoma brucei. Their sequences do not show significant homology to other proteins but are highly homologous to one another. The p34 and p37 proteins are developmentally regulated, with p34 the predominant protein in the procyclic stage and p37 nearly exclusively expressed in the bloodstream cells. In vivo metabolic labeling of procyclic cells showed that p34 and p37 were differentially translated, with levels of p34 approximately fourfold higher than p37. The newly synthesized p34 and p37 exhibited differential stability in the procyclic stage. In vitro analysis confirmed this observation and further suggested that this differential stability may be due to a trypsin-like cysteine protease activity in procyclic extracts that selectively degraded the p37 protein. Taken together, these results indicate that the developmental regulation of the T. brucei RNA binding protein, p37, occurs at both translational and post-translational levels.
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