Table 3 Proteobacterial genomes analyzed in this study

Bordetella bronchiseptica RB50

Beta

Burkholderiales

Alcaligenaceae

[GenBank:BX470250]

Ralstonia solanacearum GM1000

Beta

Burkholderiales

Burkholderiaceae

[GenBank:AL646052]

Neisseria meningitidis serogroup A strain Z2491

Beta

Neisseriales

Neisseriaceae

[GenBank:AL157959]

Nitrosomonas europaea ATCC 19718

Beta

Nitrosomonadales

Nitrosomonadaceae

[GenBank:AL954747]

Shewanella oneidensis MR-1

Gamma

Alteromonadales

Shewanellaceae

[GenBank:AE014299]

Buchnera aphidicola str. APS

Gamma

Enterobacteriales

Enterobacteriaceae

[GenBank:BA000003]

Escherichia coli O157:H7 str. Sakai

Gamma

Enterobacteriales

Enterobacteriaceae

[GenBank:BA000007]

Photorhabdus luminescens subsp. laumondii TTO1

Gamma

Enterobacteriales

Enterobacteriaceae

[GenBank:BX470251]

Salmonella enterica serovar Typhi strain Ty2

Gamma

Enterobacteriales

Enterobacteriaceae

[GenBank:AE014613]

Coxiella burnetii RSA 493

Gamma

Legionellales

Coxiellaceae

[GenBank:AE016828]

Haemophilus ducreyi 35000 HP

Gamma

Pasteurellales

Pasteurellaceae

[GenBank:AE017143]

Haemophilus influenzae Rd KW20

Gamma

Pasteurellales

Pasteurellaceae

[GenBank:L42023]

Pasteurella multocida PM70

Gamma

Pasteurellales

Pasteurellaceae

[GenBank:AE004439]

Pseudomonas aeruginosa PAO1

Gamma

Pseudomonadales

Pseudomonadaceae

[GenBank:AE004091]

Vibrio vulnificus YJ016

Gamma

Vibrionales

Vibrionaceae

[GenBank:BA000037] [GenBank:BA000038]

Xanthomonas campestris pv. campestris str. ATCC 33913

Gamma

Xanthomonadales

Xanthomonadaceae

[GenBank:AE008922]

Xylella fastidiosa 9a5c

Gamma

Xanthomonadales

Xanthomonadaceae

[GenBank:AE003849]