Enhancer RNAs stimulate Pol II pause release by harnessing multivalent interactions to NELF

Area of Science:

• Molecular Biology
• Gene Regulation
• RNA Biology

Background:

• Enhancer RNAs (eRNAs) are transcribed from enhancers and linked to activated enhancers.
• The precise molecular requirements and mechanisms for eRNA function in regulating gene transcription remain largely unknown.
• Understanding eRNA function is critical for deciphering transcriptional regulation.

Purpose of the Study:

• To investigate the sequence, structure, and length requirements of eRNAs for stimulating RNA polymerase II (Pol II) pause release.
• To elucidate the mechanism by which eRNAs facilitate the detachment of Negative Elongation Factor (NELF) from paused Pol II.
• To identify the molecular determinants governing eRNA-mediated transcriptional regulation.

Main Methods:

• Utilized an eRNA-dependent RNA polymerase II (Pol II) pause release model system.
• Analyzed the impact of eRNA sequence, structure, and length on NELF detachment.
• Investigated allosteric interactions between eRNAs and NELF subunits.

Main Results:

• eRNAs do not require common sequence or structural motifs for function.
• eRNAs exceeding 200 nucleotides in length and containing unpaired guanosines are essential for stimulating Pol II pause release.
• Functional eRNAs engage in multiple, allosteric contacts with NELF subunits -A and -E, promoting NELF release.

Conclusions:

• The study identifies specific molecular features of eRNAs (length >200 nt, unpaired guanosines) critical for their function.
• eRNAs play a significant role in regulating Pol II pause release by modulating NELF activity.
• These findings provide novel insights into the intricate mechanisms of metazoan transcriptional regulation.