{
  "abstract": "Drug resistance in Mycobacterium tuberculosis (Mtb) remains a formidable clinical hurdle, compounded by the fact that the pathways by which antibiotics penetrate its multilayered cell envelope remain incompletely mapped. We identify PPE1 as a voltage-gated outer-membrane porin that mediates the secretion of kupyaphores while also facilitating the uptake of the frontline anti-tubercular drug isoniazid (INH). Genome-wide association analysis of 38,038 clinical isolates links ppe1 mutations with INH resistance, highlighting its clinical relevance. Consistent with this, the Mtb Δppe1 mutant shows increased tolerance to INH, accompanied by markedly reduced intracellular accumulation of INH compared with the wild-type strain. The Δppe1 strain exhibits attenuated infection, impaired growth, and reduced virulence in a murine infection model. Electron microscopy, molecular modeling, and single-channel electrophysiology reveal that PPE1 assembles into an unusual pentameric α-helical channel, distinct from classical β-barrel bacterial porins. Together, our findings identify PPE1 as a key determinant of mycobacterial membrane permeability that coordinates metallophore secretion and also antibiotic influx. This work uncovers a previously unrecognized mechanism governing Mtb physiology, virulence, and drug susceptibility, providing a potential target for therapeutic intervention.",
  "abstract_shown": true,
  "affiliations": [
    "Immunometabolism Laboratory, BRIC-National Institute of Immunology, New Delhi 110067, India",
    "Membrane Biology Laboratory, Transdisciplinary Research Division, BRIC-Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram 695014, India",
    "Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560012, Karnataka, India",
    "Bioinformatics Centre, Biotechnology Research and Innovation Council-National Institute of Immunology, New Delhi 110067, India",
    "Department of Biology, Indian Institute of Science Education and Research, Pashan, Pune 411008, India"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 13,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Mohit Yadav",
      "orcid": "0009-0000-3964-4047"
    },
    {
      "affs": [
        1
      ],
      "name": "Neilah Firzan C. A.",
      "orcid": "0009-0006-6056-4168"
    },
    {
      "affs": [
        2
      ],
      "name": "Dipanwita Mandal",
      "orcid": "0000-0001-6457-1628"
    },
    {
      "affs": [
        0
      ],
      "name": "Jyotsna Shukla"
    },
    {
      "affs": [
        0
      ],
      "name": "Binayak Sarkar"
    },
    {
      "affs": [
        3
      ],
      "name": "Sanjeet Kumar Mahtha"
    },
    {
      "affs": [
        4
      ],
      "name": "Aakash Chandramouli",
      "orcid": "0009-0004-8553-1202"
    },
    {
      "affs": [
        3
      ],
      "name": "Abhishek Prasad"
    },
    {
      "affs": [
        4
      ],
      "name": "Siddhesh S. Kamat",
      "orcid": "0000-0001-6132-7574"
    },
    {
      "affs": [
        0,
        3
      ],
      "name": "Debasisa Mohanty"
    },
    {
      "affs": [
        2
      ],
      "name": "Somnath Dutta",
      "orcid": "0000-0002-3181-0108"
    },
    {
      "affs": [
        1
      ],
      "name": "Kozhinjampara R. Mahendran"
    },
    {
      "affs": [
        0,
        4
      ],
      "name": "Rajesh S. Gokhale",
      "orcid": "0000-0001-6597-2685"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/51nn0r7hhc16d.bib",
  "cited_by": 0,
  "doi": "10.1073/pnas.2602335123",
  "fulltext_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC13732215/",
  "id": "51nn0r7hhc16d",
  "issns": [
    "0027-8424",
    "1091-6490"
  ],
  "landing_url": "https://doi.org/10.1073/pnas.2602335123",
  "language": "en",
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "heading",
      "423"
    ],
    [
      "heading",
      "Biological Sciences"
    ],
    [
      "heading",
      "Microbiology"
    ],
    [
      "openalex",
      "2725|Tuberculosis Research and Epidemiology"
    ]
  ],
  "openalex": "W7223927866",
  "pdf_url": null,
  "pmcid": "PMC13732215",
  "pmid": "42945251",
  "published": "2026-10-27",
  "publisher": "National Academy of Sciences",
  "ris": "https://research.draconitic.com/paper/51nn0r7hhc16d.ris",
  "sources": [
    {
      "first_seen": "2026-11-08T12:22:14Z",
      "native_id": "PMC13732215",
      "source": "pmc",
      "url": "https://doi.org/10.1073/pnas.2602335123"
    }
  ],
  "subjects": [
    {
      "field": "biology",
      "origin": "heading:Microbiology",
      "subfield": "microbiology"
    }
  ],
  "title": "A voltage-gated porin PPE1 regulates secretion and drug resistance in Mycobacterium tuberculosis",
  "title_text": "A voltage-gated porin PPE1 regulates secretion and drug resistance in Mycobacterium tuberculosis",
  "type": "peer-reviewed",
  "updated_at": "2026-11-08T12:22:14Z",
  "url": "https://research.draconitic.com/paper/51nn0r7hhc16d",
  "venue": "Proceedings of the National Academy of Sciences of the United States of America",
  "versions": []
}