Table 1.

Potential Archaeal to Bacterial Laterally Transferred ORFs in E. coli O157:H7 EDL933 Genome. Although ORFs Z5331 and Z0509 do not have archaeal genes as the most similar BLAST hit, they are included because in general they are absent from almost all bacterial genomes.

E. coli O157:H7 designation	Location (O island)	Best BLAST hit to ORF from:	Best guess at function
Z4267	119	Methanobacterium thermoautotrophicum	ABC transporter : cations?
Z4271	119	Methanobacterium thermoautotrophicum	ABC transporter : cations?
Z5331	155	Helicobacter pylori	?
Z0509	25	Yersinia pestis	?
Z5989	172	Halobacterium sp. NRC-1	Helicase
Z5900	172	Halobacterium sp. NRC-1	Helicase