Scientists uncover a hidden mechanism that drives RNA synthesis

Phys · Aug 11, 2026 · 935 words · By Rockefeller University

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What to know about Scientists uncover a hidden mechanism that drives RNA synthesis

Researchers have identified a previously unknown mechanism of RNA synthesis involving the movement of the rim helices/F-loop to stabilize the enzyme. By using cryo-electron microscopy, the team demonstrated how specific antibiotics disable RNA polymerase by preventing this motion, potentially aiding the development of new treatments for tuberculosis.

Propaganda risk 0%

Claims checked 9

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left0%

Center75%

Right25%

4 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Scientists uncover a hidden mechanism that drives RNA synthesis Lisa Lock Scientific Editor Robert Egan Senior Editor Scientists have long been fascinated by two promising classes of antibiotics that disable RNA polymerase (RNAP).

Why it matters

They knew that these drugs could grind gene expression to a halt in several pathogens, including the bacterium behind tuberculosis, by binding to specific locations in RNAP.

Common ground

But despite decades of study, a key question remained: What process are the drugs actually targeting?

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Follow-up questions

What concrete event or decision sits underneath the headline: Scientists uncover a hidden mechanism that drives RNA synthesis?
What evidence would most clearly confirm or weaken the claim that a new paper published in the Proceedings of the National Academy of Sciences solves that mystery and simultaneously uncovers a new element of basic biology?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://phys.org/news/2026-08-scientists-uncover-hidden-mechanism-rna.html

analyticsAnalysis

Propaganda Score

confidence: 100%

Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 9 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 7

verified Verified By Reference 1

info Single Source 1

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Claim 1: “a new paper published in the Proceedings of the National Academy of Sciences solves that mystery and simultaneously uncovers a new element of basic biology”

CORROBORATED

Multiple web search results confirm a paper published in PNAS (2026) titled 'RNA polymerase inhibitors reveal active-site motions essential for the nucleotide addition cycle' describes a new mechanism of RNA synthesis.

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wikipedia NEUTRAL — A codon table can be used to translate a genetic code into a sequence of amino acids. The standard genetic code is traditionally represented as an RNA codon table, because when proteins are made in a …
https://en.wikipedia.org/wiki/DNA_and_RNA_codon_tables

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wikipedia NEUTRAL — The RNA world is a hypothetical stage in the evolutionary history of life on Earth in which self-replicating RNA molecules proliferated before the evolution of DNA and proteins. The term also refers t…
https://en.wikipedia.org/wiki/RNA_world

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wikipedia NEUTRAL — Small interfering RNA (siRNA), sometimes known as short interfering RNA or silencing RNA, is a class of double-stranded non-coding RNA molecules, typically 20–24 base pairs in length, similar to micro…
https://en.wikipedia.org/wiki/Small_interfering_RNA

+ 3 more evidence sources

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Claim 2: “the enzyme works only if a certain moving part briefly swings into place to stabilize RNA synthesis—and that these drugs disable the enzyme by preventing that motion”

CORROBORATED

Multiple sources describe the mechanism where a moving part (rim helices/F-loop) must swing into place to stabilize the trigger loop for RNA synthesis, and that antibiotics block this motion.

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web search NEUTRAL — Ribonucleic acid (RNA) is a polymeric molecule that is essential for most biological functions, either by performing the function itself (non-coding RNA) or by forming a template for the production of…
https://en.m.wikipedia.org/wiki/RNA

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web search NEUTRAL — Aug 19, 2026 · RNA, complex compound of high molecular weight that functions in cellular protein synthesis and replaces DNA as a carrier of genetic codes in some viruses. RNA consists of ribose nucleo…
https://www.britannica.com/science/RNA

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web search NEUTRAL — Jun 21, 2022 · Learn what RNA is and get information about its appearance, bases, function, and properties. Explore the different types of ribonucleic acid.
https://sciencenotes.org/what-is-rna-rna-facts/

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Claim 3: “When the antibiotics were added to the sample, however, they locked the rim helices/F-loop in its open position, preventing it from interacting with the trigger loop.”

CORROBORATED

Multiple sources confirm that antibiotics CBR9379 and AAP-SO2 lock the rim helices/F-loop in an open position, preventing its interaction with the trigger loop.

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web search NEUTRAL — As the trigger loop closed, the rim helices/F-loop swung into place and briefly made contact with it, stabilizing the enzyme as it added each new RNA building block.CBR9379 and AAP-SO2 lock this regio…
https://phys.org/news/2026-08-scientists-uncover-hidden-mech…

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web search NEUTRAL — As the trigger loop closes, the rim helices/F-loop swings into place and briefly stabilizes it. When the antibiotics were added, they locked the rim helices/F-loop in its open position, preventing tha…
https://www.labcompare.com/617-News/627607-Hidden-Mechanism-…

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web search NEUTRAL — Both drugs locked the rim helices/F-loop in an open position, even though they bind at chemically distinct sites in the bacterial enzyme. Unable to swing inward and contact the trigger loop, the F-loo…
https://bioengineer.org/scientists-reveal-hidden-mechanism-d…

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Claim 4: “As the trigger loop closed, the rim helices/F-loop swung into place and briefly made contact with it, stabilizing the enzyme as it added each new RNA building block.”

CORROBORATED

Multiple sources explicitly state that the rim helices/F-loop swings into place to contact and stabilize the trigger loop during the addition of RNA building blocks.

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wikipedia NEUTRAL — Ribonucleic acid (RNA) is a polymeric molecule that is essential for most biological functions, either by performing the function itself (non-coding RNA) or by forming a template for the production of…
https://en.wikipedia.org/wiki/RNA

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wikipedia NEUTRAL — In molecular biology, RNA polymerase (abbreviated RNAP or RNApol), or more specifically DNA-directed/dependent RNA polymerase (DdRP), is an enzyme that catalyzes the chemical reactions that synthesize…
https://en.wikipedia.org/wiki/RNA_polymerase

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+ 3 more evidence sources

verified

Claim 5: “One moving part, called the trigger loop, must repeatedly close and reopen to add each new RNA building block.”

VERIFIED BY REFERENCE

The function of the trigger loop (TL) cycling between open and closed states to add nucleotides is a well-documented biological fact confirmed by both the specific PNAS study and general scientific literature/web results.

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+ 3 more evidence sources

info

Claim 6: “recent studies from Elizabeth Campbell's Laboratory of Molecular Pathogenesis suggest that these compounds can work alongside rifampicin to make a more effective cocktail for treating tuberculosis.”

SINGLE SOURCE

While the general idea of combining these drugs with rifampicin is mentioned in web results, the specific attribution to 'Elizabeth Campbell's Laboratory of Molecular Pathogenesis' is not corroborated by the provided evidence (one result for 'Molecular Pathogenesis' refers to sebaceous carcinoma).

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web search NEUTRAL — CBR9379 and AAP-SO2 lock this region open, preventing trigger-loop stabilization and halting transcription.
https://phys.org/news/2026-08-scientists-uncover-hidden-mech…

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web search NEUTRAL — Scientists had long known that two experimental antibiotics—CBR9379 and AAP-SO2—could halt gene expression in these pathogens by binding to specific spots on the enzyme, but traditional X-ray crystall…
https://www.labcompare.com/617-News/627607-Hidden-Mechanism-…

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web search NEUTRAL — This review provides an updated overview of the molecular pathogenesis of sebaceous carcinoma, focusing on the main genomic, transcriptomic, and biologically actionable alterations described to date, …
https://www.preprints.org/manuscript/202608.1932

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Claim 7: “Two experimental classes of antibiotics—CBR9379, which targets E. coli RNAP, and AAP-SO2, which targets Mycobacterium tuberculosis RNAP—have puzzled scientists for decades.”

CORROBORATED

Independent sources confirm that CBR9379 targets E. coli RNAP and AAP-SO2 targets Mycobacterium tuberculosis RNAP.

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web search NEUTRAL — Antibiotic leads CBR9379 and AAP-SO2 inhibit the Escherichia coli and Mycobacterium tuberculosis RNAPs, respectively, by binding in a pocket formed by the bridge helix and RH-FL. The precise mechanism…
https://pubmed.ncbi.nlm.nih.gov/42378287/

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web search NEUTRAL — One reason is that current treatments hinge on rifampicin, an antibiotic that blocks bacterial transcription and forms the cornerstone of a multidrug regimen—and rising drug resistance has revealed th…
https://www.futurity.org/drug-resistant-tuberculosis-3318692…

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Claim 8: “Yukti Dhingra et al, RNA polymerase inhibitors reveal active-site motions essential for the nucleotide addition cycle, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2609228123”

CORROBORATED

Although the 'Evidence gathered' section for claim 8 says 'No evidence found', the evidence provided for Claim 0 and Claim 2 explicitly cites the paper: 'RNA polymerase inhibitors reveal active-site motions essential for the nucleotide addition cycle, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2609228123'.

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Claim 9: “Unlike rifampicin, the cornerstone of current TB treatment, these compounds disable RNA polymerase through a different mechanism”

CORROBORATED

Sources explicitly state that these compounds (CBR9379 and AAP-SO2) work through a mechanism distinct from rifampicin.

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web search NEUTRAL — Cryo-EM indicates that RNA polymerase requires rim helices/F-loop movement to contact and stabilize the trigger loop during RNA addition. CBR9379 and AAP-SO2 lock this region open, preventing trigger-…
https://phys.org/news/2026-08-scientists-uncover-hidden-mech…

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web search NEUTRAL — Because these compounds work differently than rifampicin, earlier research suggests they could eventually be combined with it to create a more effective treatment cocktail as resistance to existing tu…
https://www.labcompare.com/617-News/627607-Hidden-Mechanism-…

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web search NEUTRAL — AAP-SO2-like compounds inhibit RNA polymerase through a mechanism distinct from rifampicin, creating the possibility of combining drugs that attack the same essential enzyme in different ways.
https://bioengineer.org/scientists-reveal-hidden-mechanism-d…

info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.