ArticleThe EMBO journal2023
Cryo-EM structure of antibacterial efflux transporter QacA from Staphylococcus aureus reveals a novel extracellular loop with allosteric role.
Article in The EMBO journal, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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.
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.
Who cites it
11 citing papers in PubMed, 13 citations in OpenAlex.
- The efflux pump QacA mediates the transition to vancomycin heteroresistance in sequence type 5 methicillin-resistantEmerging microbes & infections · 2026Article
- Overview of the ASM-IISc Symposium on the One Health Approach to AMR in Bengaluru, India.mSphere · 2026Article
- Electroporation of pLI50 harboring qacA or qacB increases chlorhexidine minimal inhibitory concentrations in transformed Staphylococcus aureus strain RN4220.Scientific reports · 2026Article
- A model for drug transport across two membranes of Gram-negative bacteria by an MFS tripartite assembly.Nature communications · 2026Article
- Structure and inhibition mechanisms of Mycobacterium tuberculosis essential transporter efflux protein A.Nature communications · 2025Article
- Analysis of co-occurrence of type II toxin-antitoxin systems and antibiotic resistance determinants inmSystems · 2025Article
- Highly Effective Biocides againstACS infectious diseases · 2024Article
- Structure and function ofProceedings of the National Academy of Sciences of the United States of America · 2024Article
- Dynamics underlie the drug recognition mechanism by the efflux transporter EmrE.Nature communications · 2024Article
- Proton-coupled transport mechanism of the efflux pump NorA.Nature communications · 2024Article
- Cryo-EM structure of antibacterial efflux transporter QacA from Staphylococcus aureus reveals a novel extracellular loop with allosteric role.The EMBO journal · 2023Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors at 2 institutions in 1 country.
Funding
Abstract
Efflux of antibacterial compounds is a major mechanism for developing antimicrobial resistance. In the Gram-positive pathogen Staphylococcus aureus, QacA, a 14 transmembrane helix containing major facilitator superfamily antiporter, mediates proton-coupled efflux of mono and divalent cationic antibacterial compounds. In this study, we report the cryo-EM structure of QacA, with a single mutation D411N that improves homogeneity and retains efflux activity against divalent cationic compounds like dequalinium and chlorhexidine. The structure of substrate-free QacA, complexed to two single-domain camelid antibodies, was elucidated to a resolution of 3.6 Å. The structure displays an outward-open conformation with an extracellular helical hairpin loop (EL7) between transmembrane helices 13 and 14, which is conserved in a subset of DHA2 transporters. Removal of the EL7 hairpin loop or disrupting the interface formed between EL7 and EL1 compromises efflux activity. Chimeric constructs of QacA with a helical hairpin and EL1 grafted from other DHA2 members, LfrA and SmvA, restore activity in the EL7 deleted QacA revealing the allosteric and vital role of EL7 hairpin in antibacterial efflux in QacA and related members.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
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.