Table 1 Fraction of singletons (Q) for various subsets of protein-encoding E. coli genes
From: Complexity, connectivity, and duplicability as barriers to lateral gene transfer
Source | Protein subset | Number of proteins | Number of singletons | Q |
|---|---|---|---|---|
SwissProt | Monomers | 137 | 87 | 0.6350 |
| Â | Homo-oligomers + monomers | 596 | 333 | 0.5587 |
| Â | Hetero-oligomers | 407 | 228 | 0.5602 |
| Â | Mid-to-large complexes (homotrimer and above) | 334 | 197 | 0.5898 |
| Â | 1 external interaction | 641 | 342 | 0.5335 |
| Â | >1 external interaction | 125 | 75 | 0.5000 |
Arifuzzaman et al. 2006 [9] | 1 external interaction | 371 | 193 | 0.5202 |
| Â | >1 external interaction | 1,916 | 1,049 | 0.5475 |
Ragan 2001 [11] | LGT due to atypical nucleotide composition | 568 | 339 | 0.5968 |
Beiko et al. 2005 [13] | LGT by Bayesian phylogenetic analysis | 987 | 607 | 0.6150 |
PEC database | Essential genes | 233 | 173 | 0.7425 |
| Â | E. coli average | 4,308 | 2,382 | 0.5529 |