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Briegel A, Oikonomou CM, Chang YW, Kjær A, Huang AN, Kim KW, Ghosal D, Nguyen HH, Kenny D, Ogorzalek Loo RR, Gunsalus RP, Jensen GJ. Morphology of the archaellar motor and associated cytoplasmic cone in Thermococcus kodakaraensis. EMBO Rep 2017; 18:1660-1670. [PMID: 28729461 DOI: 10.15252/embr.201744070] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 06/29/2017] [Accepted: 07/04/2017] [Indexed: 11/09/2022] Open
Abstract
Archaeal swimming motility is driven by archaella: rotary motors attached to long extracellular filaments. The structure of these motors, and particularly how they are anchored in the absence of a peptidoglycan cell wall, is unknown. Here, we use electron cryotomography to visualize the archaellar basal body in vivo in Thermococcus kodakaraensis KOD1. Compared to the homologous bacterial type IV pilus (T4P), we observe structural similarities as well as several unique features. While the position of the cytoplasmic ATPase appears conserved, it is not braced by linkages that extend upward through the cell envelope as in the T4P, but rather by cytoplasmic components that attach it to a large conical frustum up to 500 nm in diameter at its base. In addition to anchoring the lophotrichous bundle of archaella, the conical frustum associates with chemosensory arrays and ribosome-excluding material and may function as a polar organizing center for the coccoid cells.
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Affiliation(s)
- Ariane Briegel
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Catherine M Oikonomou
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Yi-Wei Chang
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Andreas Kjær
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Audrey N Huang
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Ki Woo Kim
- School of Ecology and Environmental System, Kyungpook National University, Sangju, South Korea
| | - Debnath Ghosal
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Hong H Nguyen
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
| | - Dorothy Kenny
- Department of Microbiology, Immunology and Molecular Genetics, The UCLA DOE Institute, University of California, Los Angeles, CA, USA
| | - Rachel R Ogorzalek Loo
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
| | - Robert P Gunsalus
- Department of Microbiology, Immunology and Molecular Genetics, The UCLA DOE Institute, University of California, Los Angeles, CA, USA
| | - Grant J Jensen
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA .,Howard Hughes Medical Institute, Pasadena, CA, USA
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