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TitleEvolution of higher torque in Campylobacter-type bacterial flagellar motors.
Journal, issue, pagesSci Rep, Vol. 8, Issue 1, Page 97, Year 2018
Publish dateJan 8, 2018
AuthorsBonnie Chaban / Izaak Coleman / Morgan Beeby /
PubMed AbstractUnderstanding the evolution of molecular machines underpins our understanding of the development of life on earth. A well-studied case are bacterial flagellar motors that spin helical propellers for ...Understanding the evolution of molecular machines underpins our understanding of the development of life on earth. A well-studied case are bacterial flagellar motors that spin helical propellers for bacterial motility. Diverse motors produce different torques, but how this diversity evolved remains unknown. To gain insights into evolution of the high-torque ε-proteobacterial motor exemplified by the Campylobacter jejuni motor, we inferred ancestral states by combining phylogenetics, electron cryotomography, and motility assays to characterize motors from Wolinella succinogenes, Arcobacter butzleri and Bdellovibrio bacteriovorus. Observation of ~12 stator complexes in many proteobacteria, yet ~17 in ε-proteobacteria suggest a "quantum leap" evolutionary event. Campylobacter-type motors have high stator occupancy in wider rings of additional stator complexes that are scaffolded by large proteinaceous periplasmic rings. We propose a model for motor evolution wherein independent inner- and outer-membrane structures fused to form a scaffold for additional stator complexes. Significantly, inner- and outer-membrane associated structures have evolved independently multiple times, suggesting that evolution of such structures is facile and poised the ε-proteobacteria to fuse them to form the high-torque Campylobacter-type motor.
External linksSci Rep / PubMed:29311627 / PubMed Central
MethodsEM (subtomogram averaging)
Resolution82.0 - 98.0 Å
Structure data

EMDB-3910:
Arcobacter butzleri bacterial flagellar motor
Method: EM (subtomogram averaging) / Resolution: 82.0 Å

EMDB-3911:
Bdellovibrio bacteriovorus bacterial flagellar motor
Method: EM (subtomogram averaging) / Resolution: 82.0 Å

EMDB-3912:
Wolinella succinogenes bacterial flagellar motor
Method: EM (subtomogram averaging) / Resolution: 98.0 Å

Source
  • Arcobacter butzleri (bacteria)
  • Bdellovibrio bacteriovorus (bacteria)
  • Wolinella succinogenes (bacteria)

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