Borgs are large extrachromosomal elements of anaerobic methane-oxidizing archaea. Here, via in silico protein structure prediction of ~10,000 Borg proteins, the authors reveal that Borgs share numerous features with giant eukaryotic viruses, suggesting that Borgs have a viral-like lifestyle and evolutionary convergence of large extrachromosomal elements across the Domains of Life.
- Jillian F. Banfield
- Luis E. Valentin-Alvarado
- Gavin J. Knott