PreprintCited by 14Bacterial Genetics and BiotechnologyBiochemical and Structural CharacterizationMicrobial Community Ecology and Physiology

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Saccharibacteria deploy two distinct Type IV pili, driving episymbiosis, host competition, and twitching motility

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Preprint — published as 10.1093/ismejo/wraf119 · Paper page

Abstract

All cultivated Patescibacteria, or CPR, exist as obligate episymbionts on other microbes. Despite being ubiquitous in mammals and environmentally, molecular mechanisms of host identification and binding amongst ultrasmall bacterial episymbionts are largely unknown. Type 4 pili (T4P) are well conserved in this group and predicted to facilitate symbiotic interactions. To test this, we targeted T4P pilin genes in Saccharibacteria Nanosynbacter lyticus strain TM7x to assess their essentiality and roles in symbiosis. Our results revealed that N. lyticus assembles two distinct T4P, a non-essential thin pili that has the smallest diameter of any T4P and contributes to host-binding, episymbiont growth, and competitive fitness relative to other Saccharibacteria, and an essential thick pili whose functions include twitching motility. Identification of lectin-like minor pilins and modification of host cell walls suggest glycan binding mechanisms. Collectively our findings demonstrate that Saccharibacteria encode unique extracellular pili that are vital mediators of their underexplored episymbiotic lifestyle.

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Metadata

Authors
Grossman, A. S., Lei, L., Botting, J. M., Liu, J., Nahar, N., Souza, J. G. S., Liu, J., McLean, J. S., He, X., & Bor, B.
Affiliations
  • The Forsyth Institute (US)
  • Sichuan University (CN)
  • Yale University (US)
  • University of Washington (US)
Corresponding author
Bor, Batbileg
Venue
The ISME Journal
Publisher
openRxiv
Published
2024-11-25
Volume
19
Issue
1
ISSN
1751-7362 (ISSN-L)
OpenAlex
W4411134751
Cited by
14
References
135
Citations by year
2026: 9 · 2025: 5
FWCI
8.10
Type
journal article
Language
en
Open access
Locations
  • The ISME Journal (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion, cc-by-nc-nd)
Funders
  • Yale University
  • National Institutes of Health (5t90de026110-08, 1s10od034405-01, 1s10od023603-01a1)
  • National Institute of Allergy and Infectious Diseases (R01AI152421, R01AI087946)
  • National Institute of Dental and Craniofacial Research (T90 DE026110-07, T90-DE026110, R01DE023810, R01DE031274)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Structural Characterization
  • Physical Sciences › Environmental Science › Ecology › Microbial Community Ecology and Physiology
Keywords
Saccharibacteria, Patescibacteria, Candidate Phyla Radiation, type IV pili, twitching motility, host competition, bacterial competition, mock microbial community, priority effects, bacterial symbiosis

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