ArticlebioRxiv : the preprint server for biology2024
TRiC/CCT Chaperonin Governs RNA Polymerase II Activity in the Nucleus to Support RNA Homeostasis.
Article in bioRxiv : the preprint server for biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The chaperonin TRiC/CCT is a large hetero-oligomeric ringed-structure that is essential in eukaryotes. While present in the nucleus, TRiC/CCT is typically considered to function in the cytosol where it mediates nascent polypeptide folding and the assembly/disassembly of protein complexes. Here, we investigated the nuclear role of TRiC/CCT. Inactivation of TRiC/CCT resulted in a significant increase in the production of nascent RNA leading to the accumulation of noncoding transcripts. The influence on transcription was not due to cytoplasmic TRiC/CCT-activities or other nuclear proteins as the effect was observed when TRiC/CCT was evicted from the nucleus and restricted to the cytoplasm. Rather, our data support a direct role of TRiC/CCT in regulating RNA polymerase II activity, as the chaperonin modulated nascent RNA production both in vivo and in vitro. Overall, our studies reveal a new avenue by which TRiC/CCT contributes to cell homeostasis by regulating the activity of nuclear RNA polymerase II.
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