Evidence that Lin28 stimulates translation by recruiting RNA helicase A to polysomes

Jianyu Jin, Wei Jing, Xin Xiang Lei, Chen Feng, Shuping Peng, Kathleen Boris-Lawrie, Yingqun Huang

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The stem cell protein Lin28 functions to inhibit the biogenesis of a group of miRNAs but also stimulates the expression of a subset of mRNAs at the post-transcriptional level, the underlying mechanism of which is not yet understood. Here we report the characterization of the molecular interplay between Lin28 and RNA helicase A (RHA) known to play an important role in remodeling ribonucleoprotein particles during translation. We show that reducing Lin28 expression results in decreased RHA association with polysomes while increasing Lin28 expression leads to elevated RHA association. Further, the carboxyl terminus of Lin28 is necessary for interaction with both the amino and carboxyl termini of RHA. Importantly, a carboxyl terminal deletion mutant of Lin28 that retains RNA-binding activity fails to interact with RHA and exhibits dominant-negative effects on Lin28-dependent stimulation of translation. Taken together, these results lead us to suggest that Lin28 may stimulate translation by actively recruiting RHA to polysomes.

Original languageEnglish (US)
Pages (from-to)3724-3734
Number of pages11
JournalNucleic acids research
Issue number9
StatePublished - May 2011

Bibliographical note

Funding Information:
Funding for open access charge: Connecticut Stem Cell Research Grants (09SCAYALE14 to Y.H.); National Institutes of Health (RO1CA108882, P01CA100730 to K.B.-L.).


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