Examples of protein complex conservation across bacteria.

<p>Complexes are identified using a common name and an EcoCyc ID. Each complex subunit has been assigned a COG ID. Grey areas indicate OG presence, white areas indicate OG absence, and blue areas indicate essentiality in a species-specific screen (see <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1004107#sec011" target="_blank">Materials and Methods</a> for references). Values within these spaces indicate the presence of potential paralogs in the corresponding species; proteins without specified values have no paralogs. Complex structures are available in PDB: ATP synthase F1, 3OAA; succinate dehydrogenase, 1NEN; Outer membrane protein assembly complex, (2KM7, 3TGO, 3TGO, 4K3C, 2YH3). Species are arranged by their taxonomy (see <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1004107#sec011" target="_blank">Materials and Methods</a> for details) with <i>E</i>. <i>coli</i> and <i>Mycoplasma</i> serving as the most distant species.