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Application of Biolayer Interferometry BLI for Studying Protein-Protein Interactions in Transcription
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Identification and Structural Modeling of the RNA Polymerase Omega Subunits in Chlamydiae and Other Obligate
Andrew Cheng1, Danny Wan1,2, Arkaprabha Ghatak1
1Department of Pharmacology, Rutgers-Robert Wood Johnson Medical School, Piscataway, New Jersey, USA.
Mbio
|January 31, 2023
Summary
Researchers identified the missing omega subunit of Chlamydia RNA polymerase (RNAP), a crucial bacterial enzyme. This finding reveals that all obligate intracellular bacteria possess this essential RNAP component, opening new avenues for research.
Area of Science:
- Bacterial molecular biology
- Microbial genomics
Background:
- Bacterial transcription relies on RNA polymerase (RNAP), a complex enzyme.
- The RNAP core enzyme includes alpha, beta, beta-prime, and omega subunits.
- The omega subunit is vital for RNAP assembly and cellular functions like growth and stress response.
Purpose of the Study:
- To identify the elusive omega subunit of the RNA polymerase in Chlamydia, an obligate intracellular bacterium.
- To investigate the evolutionary presence of omega subunits in related bacteria.
Main Methods:
- Sequence analysis and conserved synteny to identify potential omega subunit candidates.
- Structure prediction using AlphaFold and AlphaFold-Multimer to validate function and interactions.
- Comparative genomics to assess omega orthologs in other obligate intracellular bacteria.
Main Results:
- The hypothetical protein CTL0286 was identified as the chlamydial omega subunit.
- Structural predictions support CTL0286's role in chlamydial RNAP.
- All examined obligate intracellular bacteria possess omega orthologs.
Conclusions:
- CTL0286 is the functional omega subunit of Chlamydia RNA polymerase.
- The omega subunit is conserved across obligate intracellular bacteria.
- This discovery enables further studies on chlamydial gene regulation and RNAP inhibition.
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