|Cryo-EM reveals the structural basis of long-range electron transport in a cytochrome-based bacterial nanowire.
|Year of Publication
|Filman DJ, Marino SF, Ward JE, Yang L, Mester Z, Bullitt E, Lovley DR, Strauss M
|Cryoelectron Microscopy, Cytochromes c, Electron Transport, Fimbriae, Bacterial, Geobacter, Nanowires
Electrically conductive pili from species, termed bacterial nanowires, are intensely studied for their biological significance and potential in the development of new materials. Using cryo-electron microscopy, we have characterized nanowires from conductive pili preparations that are composed solely of head-to-tail stacked monomers of the six-heme C-type cytochrome OmcS. The unique fold of OmcS - closely wrapped around a continuous stack of hemes that can serve as an uninterrupted path for electron transport - generates a scaffold that supports the unbranched chain of hemes along the central axis of the filament. We present here, at 3.4 Å resolution, the structure of this cytochrome-based filament and discuss its possible role in long-range biological electron transport.
|PubMed Central ID