HSP70 binds to specific non-coding RNA and regulates human RNA polymerase III

Area of Science:

• Molecular biology
• Cellular biology
• Biochemistry

Background:

• Molecular chaperones maintain protein homeostasis and are linked to diseases like cancer and neurodegeneration.
• Chaperone interactions with proteins are well-studied, but their interactions with RNA are less understood.

Purpose of the Study:

• To investigate the interaction between molecular chaperones and RNA in human cells.
• To identify specific chaperones and RNA molecules involved in this interaction.
• To elucidate the functional consequences of chaperone-RNA interactions.

Main Methods:

• Global chromatin profiling to identify genomic binding sites.
• Biochemical analyses to study molecular interactions.
• Investigating the role of heat shock protein 70 (HSP70) and RNA polymerase III (RNA Pol III) transcripts.

Main Results:

• Demonstrated widespread interaction between chaperones and RNA in human cells.
• Identified heat shock protein 70 (HSP70) binding to non-coding RNAs like tRNA and 5S rRNA.
• Showed HSP70 binding at genomic sites of RNA polymerase III (RNA Pol III) transcription.
• HSP70 was found to alleviate the inhibitory effect of tRNA on tRNA gene transcription.

Conclusions:

• Uncovered a novel role for HSP70-RNA interactions in the biogenesis of specific non-coding RNAs.
• This interaction has potential implications for cancer therapeutics.
• Highlights the importance of studying chaperone-RNA interactions in cellular processes.