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Stealth switch in tuberculosis enzyme could open route to drug-resistant treatment

Phys · · 437 words · By Australian Nuclear Science; Technology Organisation

New research published in Communications Biology details an advance in structural biology regarding the Mycobacterium tuberculosis (Mtb) enzyme, ICL2. The study, conducted by a team from the University of Melbourne, utilized advanced techniques like MX2 and SAXS to understand how the enzyme is activated. This discovery identifies a potential target pathway for developing modulators to treat drug-resistant tuberculosis.

open_in_new Read the original article: https://phys.org/news/2026-05-stealth-tuberculosis-enzyme-route-drug.html

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Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

11 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

info Single Source 5
check_circle Corroborated 3
help Insufficient Evidence 2
schedule Pending 1
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“Recent research published in Communications Biology marks an advance in structural biology by enhancing understanding of protein regulation mechanisms in Mycobacterium tuberculosis (Mtb), a global health threat.”
SINGLE SOURCE
The web search results confirm general information about *Mycobacterium tuberculosis* (M. tb) and its importance in research, but none of the provided evidence specifically mention a 'recent research published in Communications Biology' or the specific advancement in 'protein regulation mechanisms' related to the claim. The evidence is too general to corroborate the specific publication and finding.
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wikipedia NEUTRAL — Michael Niederweis (born 1964) is a German-American scientist, inventor, and academic. He is a university professor and the Triton Endowed Professor of Microbiology at the University of Alabama at Bir…
https://en.wikipedia.org/wiki/Michael_Niederweis
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wikipedia NEUTRAL — Mycobacterium tuberculosis (M. tb), also known as Koch's bacillus, is a species of pathogenic bacteria in the family Mycobacteriaceae and the causative agent of tuberculosis. First discovered in 1882 …
https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis
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wikipedia NEUTRAL — Thioredoxin reductases (TR, TrxR) (EC 1.8.1.9) are enzymes that reduce thioredoxin (Trx). Two classes of thioredoxin reductase have been identified: one class in bacteria and some eukaryotes and one i…
https://en.wikipedia.org/wiki/Thioredoxin_reductase
+ 3 more evidence sources
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“The team led by the University of Melbourne combined several advanced techniques at the Australian Synchrotron and the National Deuteration Facility to reveal the hidden allosteric mechanism that activates a key enzyme, ICL2.”
SINGLE SOURCE
The evidence provided contains general information about the Australian Synchrotron and advanced techniques (like X-ray imaging and ANSTO research), but none of the snippets specifically mention 'University of Melbourne,' 'Australian Synchrotron,' 'National Deuteration Facility,' or the discovery of the 'allosteric mechanism activating the ICL2 enzyme' in combination. The claim is highly specific and cannot be corroborated by the provided search results.
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wikipedia NEUTRAL — The Australian National University (ANU) is a public research university and member of the Group of Eight, located in Canberra, the capital of Australia. Its main campus in Acton encompasses seven tea…
https://en.wikipedia.org/wiki/Australian_National_University
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wikipedia NEUTRAL — The Australian Synchrotron is a 3 GeV national synchrotron radiation facility located in Clayton, in the south-eastern suburbs of Melbourne, Victoria. The facility opened in 2007, and is operated by t…
https://en.wikipedia.org/wiki/Australian_Synchrotron
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wikipedia NEUTRAL — Melbourne ( MEL-bərn, locally [ˈmæɫbən] ; Boonwurrung/Woiwurrung: Narrm or Naarm) is the capital and most populous city of the Australian state of Victoria, and the second most-populous city in Austra…
https://en.wikipedia.org/wiki/Melbourne
+ 3 more evidence sources
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“The study opens a target pathway to treat drug-resistant TB with modulators that can interfere with the enzyme's "on switch."”
SINGLE SOURCE
The web search results confirm that ICLs and LAT are promising drug targets for persistent TB infection and that understanding anti-tuberculosis drug action is critical. However, none of the provided snippets specifically state that 'The study identified a target pathway for treating drug-resistant TB using modulators that interfere with the ICL2 enzyme's activation mechanism.' The evidence supports the general premise but not the specific conclusion of the study.
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web search NEUTRAL — The clinical treatment dificulty of TB is not only the emergence of drug-resistant bacteria but also the immune evasion mechanism unique to Mtb. Resuscitation-promoting factor interacting protein (Rip…
https://www.frontiersin.org/journals/medicine/articles/10.33…
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web search NEUTRAL — Abstract Multidrug-resistant tuberculosis (MDR-TB) is a significant public health challenge globally, exacerbated by the limited efficacy of existing therapeutic approaches, prolonged treatment durati…
https://pmc.ncbi.nlm.nih.gov/articles/PMC12029526/
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web search NEUTRAL — All these enzymes are either validated drug targets or promising target candidates, with drugs targeting ICLs and LAT expected to solve the problem of persistent TB infection. To better understand how…
https://link.springer.com/article/10.1186/s43556-022-00106-y
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“However, ICL2 is unique to mycobacteria and is essential for the survival of the TB bacterium during infection, especially when it is starved of sugar and forced to live on fats.”
SINGLE SOURCE
The web search results confirm that *Mycobacterium tuberculosis* is a pathogenic bacteria and that research investigates its survival mechanisms (e.g., LpqT improving survival in macrophages). However, none of the provided evidence specifically state that 'ICL2 is unique to mycobacteria' or that it is essential for survival 'when the bacterium is starved of sugar and metabolizing fats.' The claim is too specific to be corroborated.
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web search NEUTRAL — Mycobacterium tuberculosis (M. tb), also known as Koch's bacillus, is a species of pathogenic bacteria in the family Mycobacteriaceae and the causative agent of tuberculosis.[1][2].
https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis
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web search NEUTRAL — Active TB Disease: In active TB, the bacteria multiply and cause symptoms. People with active TB can spread the infection to others through the air. TB spreads when an infected person coughs, sneezes,…
https://redcliffelabs.com/myhealth/health/world-tb-day-2026-…
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web search NEUTRAL — To investigate its function, we constructed M. smegmatis strains deficient of LpqT or overexpressing LpqT. Wildtype or LpqT modified M. smegmatis strains were used to infect macrophages and mice, and …
https://pubmed.ncbi.nlm.nih.gov/30029916/
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“The Macromolecular Crystallography (MX2) beamline was instrumental in determining the crystal structure of an inactive form of the ICL2 enzyme at a high resolution.”
SINGLE SOURCE
The web search results confirm the existence and use of beamlines (like SAXS/WAXS) and the general determination of protein structures. However, none of the provided evidence specifically mention 'The Macromolecular Crystallography (MX2) beamline' or its use to determine the 'high-resolution crystal structure of an inactive form of the ICL2 enzyme.' The claim is too specific to be corroborated.
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web search NEUTRAL — The distribution of the beamlines around the synchrotron radiation source is given in fig. 1. The outer circumference of the storage ring building contains laboratory facilities, which are closely lin…
https://www.researchgate.net/figure/Distribution-of-beamline…
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web search NEUTRAL — How to draw the Lewis Structure of SO2 - with explanationCheck me out: http://www.chemistnate.com.
https://www.youtube.com/watch?v=xDG8EQ2Fq8w
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web search NEUTRAL — Based on this structure, on the structure of the NTD, and on small angle x-ray scattering (SAXS) data of the full-length enzyme measured at SSRL Beam Line 4-2, they have developed a model of the full-…
https://www-ssrl.slac.stanford.edu/smb-saxs/content/highligh…
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“This allowed researchers to see the exact positions of atoms and confirm the formation of specific chemical bonds (disulfide bridges) used to lock the enzyme in a particular shape, called the "fixed" version.”
CORROBORATED
Multiple web search results confirm the importance of determining specific chemical bonds, particularly disulfide bridges, in protein structure determination. One source explicitly mentions that 'Precise determination of disulfide linkages between cysteine (Cys) residues in proteins is essential in the determination of protein structure.' This corroborates the general scientific principle stated in the claim.
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web search NEUTRAL — This allowed researchers to see the exact positions of atoms and confirm the formation of specific chemical bonds (disulfide bridges) used to lock the enzyme in a particular shape; called the “fixed” …
https://www.ansto.gov.au/news/landmark-achievement-opens-pat…
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web search NEUTRAL — Another fast method for identification of disulfide bridges that is inex-pensive, still in use, and effective is high-performance liq-uid chromatography (HPLC) analysis of disulfide-linked peptides or…
https://slas-technology.org/article/S2472-6303(22)01705-8/pd…
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web search NEUTRAL — Precise determination of disulfide linkages between cysteine (Cys) residues in proteins is essential in the determination of protein structure.
https://www.researchgate.net/publication/230656942_Automatic…
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“The Small-angle X-ray scattering (SAXS/WAXS) beamline was used to understand the enzyme's behavior in its natural, fluid state.”
CORROBORATED
Multiple web search results confirm the existence and function of the SAXS/WAXS beamline, describing it as a flexible X-ray scattering facility used for studying protein structure and dynamics.
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web search NEUTRAL — The Xeuss 2.0: The SAXS/WAXS laboratory beam line and is a step forward into high performance SAXS/WAXS measurements in the lab.
https://www.youtube.com/watch?v=N6TNv_O5qJw
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web search NEUTRAL — The SAXS/WAXS beamline is a flexible x-ray scattering facility due to the design of the optics and a highly adaptable endstation and sample stage. Transmission SAXS and vertical dispersion WAXS are th…
http://archive.synchrotron.org.au/aussyncbeamlines/saxswaxs
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web search NEUTRAL — SAXS/WAXS Beamline. By IT Support (Unlicensed). 1 min. Add a reaction. The SAXS/WAXS beamline is a flexible X-ray scattering facility due to the design of the optics, and a highly adaptable endstation…
https://asuserwiki.atlassian.net/wiki/spaces/UO/pages/225443…
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“It revealed that without its activator, the enzyme is highly flexible and has multiple orientations.”
CORROBORATED
The web search results contain a direct statement linking SAXS/WAXS to understanding the enzyme's behavior in its natural, fluid state and revealing that 'without its activator, the enzyme is highly flexible and has multiple orientations.' This is a direct corroboration of the claim's core finding.
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web search NEUTRAL — The Small-angle X-ray scattering (SAXS/WAXS) beamline was used to understand the enzyme’s behaviour in its natural, fluid state. It revealed that without its activator, the enzyme is highly flexible a…
https://www.ansto.gov.au/news/landmark-achievement-opens-pat…
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web search NEUTRAL — Dive into the research topics of 'Operando SAXS/WAXS Reveals the Formation of Li+ Conduction Pathways Enabled by Apocynum Venetum-Derived Nanocellulose'.
https://scholar.hit.edu.cn/en/publications/operando-saxswaxs…
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web search NEUTRAL — SAXS and WAXS probe the anisotropy of scattering intensities in reciprocal space. When nanoscale features or crystalline domains are preferentially aligned, their scattering becomes direction-dependen…
https://www.xenocs.com/saxs-characterization/orientation-ana…
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“To overcome technical hurdles in nuclear magnetic resonance (NMR) imaging, a team at the National Deuteration Facility (NDF) produced a partially deuterated form of the protein.”
INSUFFICIENT EVIDENCE
No evidence was provided in the evidence gathering section for this claim, and the search results were empty. Therefore, the claim cannot be evaluated.
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“This precision labeling allowed investigators to see dynamic changes that are otherwise invisible, allowing the team to confirm that the enzyme forms two identical molecules, a dimer, when it is activated.”
INSUFFICIENT EVIDENCE
No evidence was provided in the evidence gathering section for this claim, and the search results were empty. Therefore, the claim cannot be evaluated.
schedule
“Evelyn Yu-Wen Huang et al, Structural basis of allosteric activation of Mycobacterium tuberculosis isocitrate lyase 2, Communications Biology (2026). DOI: 10.1038/s42003-026-09821-6”
PENDING
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.