Evidence map›Paper›PMID 31768032›Full record

ArticleNature chemical biology2020

Discovery of an antivirulence compound that reverses β-lactam resistance in MRSA.

Omar M El-Halfawy, Tomasz L Czarny, Ronald S Flannagan, Jonathan Day, José Carlos Bozelli, Robert C Kuiack, Ahmed Salim, Philip Eckert, Richard M Epand, Martin J McGavin and 3 more

Abstract read
PubMed Publisher
In one paragraph

Article in Nature chemical biology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 43 papers.

0numbers the graph read from it
0cells of the map it votes in
43citing papers in PubMed
7.3field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

43 citing papers in PubMed, 87 citations in OpenAlex.

  1. Article
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  8. ThemBio · 2025
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  19. Sensitizing methicillin-resistantAntimicrobial agents and chemotherapy · 2024
    Article
  20. Review
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

13 authors at 5 institutions in 2 countries.

Omar M El-HalfawyDepartment of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada.ORCID http://orcid.org/0000-0003-2829-5851
Tomasz L CzarnyDepartment of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada.
Ronald S FlannaganDepartment of Microbiology and Immunology, The University of Western Ontario, London, Ontario, Canada.ORCID http://orcid.org/0000-0002-3263-2227
Jonathan DayDepartment of Chemistry, York University, Toronto, Ontario, Canada.
José Carlos BozelliDepartment of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada.ORCID http://orcid.org/0000-0001-9533-0886
Robert C KuiackDepartment of Microbiology and Immunology, The University of Western Ontario, London, Ontario, Canada.ORCID http://orcid.org/0000-0001-9677-258X
Ahmed SalimDepartment of Chemistry, York University, Toronto, Ontario, Canada.ORCID http://orcid.org/0000-0002-2724-5126
Philip EckertCentre for Catalysis Research and Innovation (CCRI) and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, Canada.
Richard M EpandDepartment of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada.ORCID http://orcid.org/0000-0002-9602-9558
Martin J McGavinDepartment of Microbiology and Immunology, The University of Western Ontario, London, Ontario, Canada.
Michael G OrganDepartment of Chemistry, York University, Toronto, Ontario, Canada.
David E HeinrichsDepartment of Microbiology and Immunology, The University of Western Ontario, London, Ontario, Canada.ORCID http://orcid.org/0000-0002-7217-2456
Eric D BrownDepartment of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada. ebrown@mcmaster.ca.ORCID http://orcid.org/0000-0002-7624-8112
McMaster University · CAWestern University · CAUniversity of Ottawa · CAYork University · CAAlexandria University · EG

Funding

CIHR FRN-143215
6 · The paper itself

Abstract

Staphylococcus aureus is the leading cause of infections worldwide, and methicillin-resistant strains (MRSA) are emerging. New strategies are urgently needed to overcome this threat. Using a cell-based screen of ~45,000 diverse synthetic compounds, we discovered a potent bioactive, MAC-545496, that reverses β-lactam resistance in the community-acquired MRSA USA300 strain. MAC-545496 could also serve as an antivirulence agent alone; it attenuates MRSA virulence in Galleria mellonella larvae. MAC-545496 inhibits biofilm formation and abrogates intracellular survival in macrophages. Mechanistic characterization revealed MAC-545496 to be a nanomolar inhibitor of GraR, a regulator that responds to cell-envelope stress and is an important virulence factor and determinant of antibiotic resistance. The small molecule discovered herein is an inhibitor of GraR function. MAC-545496 has value as a research tool to probe the GraXRS regulatory system and as an antibacterial lead series of a mechanism to combat drug-resistant Staphylococcal infections.

Indexed as

AnimalsAnti-Bacterial Agentsbeta-Lactam ResistanceBiofilmsHigh-Throughput Screening AssaysLarvaLepidopteraMethicillin-Resistant Staphylococcus aureusMiceMicrobial Sensitivity TestsPiperidinesPyridinesRAW 264.7 CellsStaphylococcal InfectionsVirulence FactorsAnti-Bacterial AgentsPiperidinesPyridinesVirulence Factors

Identifiers

PMID31768032
OpenAlexW2989847448

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.