User:Nikhil Malvankar/Geobacter pilus

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Structural basis for metallic-like conductivity in microbial nanowires.

Nikhil S. Malvankar, Madeline Vargas, Kelly Nevin, Pier-Luc Tremblay, Kenneth Evans-Lutterodt, Dmytro Nykypanchuk, Eric Martz, Mark T. Tuominen, Derek R. Lovley. mBio 6(2):e00084-15 (2015). (doi:10.1128/mBio.00084-15)

CAVEAT: The homology model described here was published in 2015. In 2019, cryo-EM structures of highly conductive Geobacter nanowires were found to be composed of the cytochrome OmcS[1][2]. This called into question whether highly conductive pilus nanowires composed of the protein pilA exist.


Molecular Tour

Geobacter pilus homology model

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Theoretical Model: The protein structure described on this page was determined theoretically, and hence should be interpreted with caution.


Pilus Model

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Notes & References

  1. Wang F, Gu Y, O'Brien JP, Yi SM, Yalcin SE, Srikanth V, Shen C, Vu D, Ing NL, Hochbaum AI, Egelman EH, Malvankar NS. Structure of Microbial Nanowires Reveals Stacked Hemes that Transport Electrons over Micrometers. Cell. 2019 Apr 4;177(2):361-369.e10. doi: 10.1016/j.cell.2019.03.029. PMID:30951668 doi:
  2. Filman DJ, Marino SF, Ward JE, Yang L, Mester Z, Bullitt E, Lovley DR, Strauss M. Cryo-EM reveals the structural basis of long-range electron transport in a cytochrome-based bacterial nanowire. Commun Biol. 2019 Jun 19;2(1):219. doi: 10.1038/s42003-019-0448-9. PMID:31925024 doi:
  3. A Geobacter sulfurreducens pilin (pilA) homology model was constructed by Swiss-Model, templated on the X-ray crystallographic structure of Pseudomonas aeruginosa pilin (1oqw, chain A). This model represents residues 1-60 of the mature pilin protein (length 61 amino acids: residues 30-90 of Q74D23), sequence FTLIELLIVVAIIGILAAIAIPQFSAYRVKAYNSAASSDLRNLKTALESAFADDQTYPPES. This monomer includes six aromatic residues, F1, F24, Y27, Y32, F51 and Y57.
  4. We employed the NMR structure of Geobacter sulfurreducens pilin, 2m7g. We employed model 5 of this 18-conformer ensemble because model 5 had the best clash score and MolProbity score.
  5. The Geobacter sequence is identical to the template Pseudomonas sequence in 22 of the first 23 residues. Residues 24-50 have 26% sequence identity.
  6. Craig L, Pique ME, Tainer JA. Type IV pilus structure and bacterial pathogenicity. Nat Rev Microbiol. 2004 May;2(5):363-78. PMID:15100690 doi:

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