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A NusG Specialized Paralog That Exhibits Specific, High-Affinity RNA-Binding Activity
Amr Elghondakly1, Chih Hao Wu2, Steven Klupt2
1The University of Maryland, Department of Chemistry and Biochemistry, College Park, MD, United States.
Journal of Molecular Biology
|June 13, 2021
Summary
Bacterial transcription factor LoaP specifically binds RNA hairpins in target operons. This discovery reveals a new RNA-binding role for NusG proteins and identifies a sequence feature for predicting LoaP-regulated genes.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Bacterial transcription factor NusG is crucial for transcription elongation.
- NusG proteins interact with RNA polymerase (RNAP) and other factors.
- NusG paralogs regulate specific genes, but their mechanisms are often unknown.
Purpose of the Study:
- To investigate the function and binding mechanism of the NusG paralog LoaP.
- To identify the molecular interactions governing LoaP's gene regulation.
- To expand the understanding of NusG CTD interactions during transcription.
Main Methods:
- Bacterial genetics
- Biochemical assays
- RNA-binding studies
Main Results:
- LoaP specifically binds a small RNA hairpin in the 5' leader of target operons with high affinity.
- Unlike other NusG proteins, LoaP exhibits direct RNA-binding activity.
- A specific RNA sequence feature was identified for LoaP recognition.
Conclusions:
- LoaP utilizes a unique RNA-binding mechanism not previously observed in NusG proteins.
- The identified RNA hairpin serves as a recognition element for LoaP.
- This finding expands the known functions of the NusG C-terminal domain (CTD) to include RNA binding.
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