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How Did the Archaellum Get Its Rotation?

Davi Ortega1, Morgan Beeby2

  • 1Koan Labs, São Paulo, Brazil.

Frontiers in Microbiology
|May 13, 2022
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The archaellum, a rotary motor in archaea, evolved from non-rotary ancestors within the type IV filament superfamily. Its exact evolutionary path to rotation remains an open question in evolutionary biology.

Keywords:
archaeal flagellaarchaellum/archaea/archaellum motor complexbiophysicsgenomicsin situ structural biologymolecular evolutionpropulsive nanomachines

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Area of Science:

  • Evolutionary biology
  • Microbiology
  • Molecular machines

Background:

  • The archaellum is a rotary motor in archaea, analogous to bacterial flagella.
  • It is part of the type IV filament superfamily, which includes non-rotary structures like pili.
  • Understanding its evolution offers insights into the development of biological rotary motion.

Purpose of the Study:

  • To review the current understanding of archaellum evolution.
  • To identify existing clues regarding the origin of its rotation.
  • To highlight knowledge gaps and future research directions.

Main Methods:

  • Literature review of evolutionary biology and molecular microbiology studies.
  • Comparative analysis of archaellum and related type IV filament structures.
  • Synthesis of existing data on the functional and structural evolution of molecular motors.

Main Results:

  • The archaellum shares ancestry with non-rotary type IV filaments.
  • The transition from non-rotary to rotary function is not fully understood.
  • Clues exist within the structural and functional relationships within the superfamily.

Conclusions:

  • The archaellum's rotary function likely evolved from non-rotary ancestors.
  • Further research is needed to elucidate the specific mechanisms and evolutionary steps involved.
  • Comparative studies within the type IV filament superfamily are crucial for resolving this question.