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Structural diversity and clustering of bacterial flagellar outer domains

Author

Listed:
  • Jessie Lynda Fields

    (University of Alabama at Birmingham)

  • Hua Zhang

    (Oregon Health & Science University)

  • Nathan F. Bellis

    (University of Alabama at Birmingham)

  • Holly A. Petersen

    (University of Alabama at Birmingham)

  • Sajal K. Halder

    (University of Alabama at Birmingham)

  • Shane T. Rich-New

    (University of Alabama at Birmingham)

  • Mart Krupovic

    (Archaeal Virology Unit)

  • Hui Wu

    (Oregon Health & Science University)

  • Fengbin Wang

    (University of Alabama at Birmingham
    University of Alabama at Birmingham)

Abstract

Supercoiled flagellar filaments function as mechanical propellers within the bacterial flagellum complex, playing a crucial role in motility. Flagellin, the building block of the filament, features a conserved inner D0/D1 core domain across different bacterial species. In contrast, approximately half of the flagellins possess additional, highly divergent outer domain(s), suggesting varied functional potential. In this study, we report atomic structures of flagellar filaments from three distinct bacterial species: Cupriavidus gilardii, Stenotrophomonas maltophilia, and Geovibrio thiophilus. Our findings reveal that the flagella from the facultative anaerobic G. thiophilus possesses a significantly more negatively charged surface, potentially enabling adhesion to positively charged minerals. Furthermore, we analyze all AlphaFold predicted structures for annotated bacterial flagellins, categorizing the flagellin outer domains into 682 structural clusters. This classification provides insights into the prevalence and experimental verification of these outer domains. Remarkably, two of the flagellar structures reported herein belong to a distinct cluster, indicating additional opportunities on the study of the functional diversity of flagellar outer domains. Our findings underscore the complexity of bacterial flagellins and open up possibilities for future studies into their varied roles beyond motility.

Suggested Citation

  • Jessie Lynda Fields & Hua Zhang & Nathan F. Bellis & Holly A. Petersen & Sajal K. Halder & Shane T. Rich-New & Mart Krupovic & Hui Wu & Fengbin Wang, 2024. "Structural diversity and clustering of bacterial flagellar outer domains," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53923-w
    DOI: 10.1038/s41467-024-53923-w
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