Probable transporter of a GTP-driven Fe(2+) uptake system across the cell inner membrane into the cytoplasm, shown for strain NCTC 11168 (PubMed:16988218). Detected in iron-restricted, mid-log-phase cells, part of the feoA-feoB operon (strain NCTC 11168). Loss of 90% of Fe(2+) uptake into the cytoplasm, reduced growth rate in iron-limited medium, strain NCTC 11168; in iron-rich medium Fe(2+) uptake is not affected (PubMed:16988218). Reduced survival in human and pig epithelial cells after 3 days, strain 81-176 (PubMed:16988218). Reduced ability to colonize chick cecum, strains 81-176, ATCC 43431 and NCTC 11168 (PubMed:16988218). Outcompeted by wild-type bacteria in infection assays in piglets; the 3 different strains colonize different regions of the gut differently (PubMed:16988218). Fe(2+) ion uptake in diverse strains of C.jejuni is much lower than in E.coli and H.pylori. Site-directed mutations in FeoB cause no defect in Fe(2+) uptake. Belongs to the TRAFAC class TrmE-Era-EngA-EngB-Septin-like GTPase superfamily. FeoB GTPase (TC 9.A.8) family. Has been reported not to be involved in Fe(2+) uptake in strains F38001 and M129, when the strains were grown in iron-containing medium (PubMed:14735223). When the feoB deletion strain of NCTC 11168 is grown in iron-containing medium Fe(2+) uptake occurs, suggesting the prior results in strain F38001 and M129 may not be correct (PubMed:16988218). Truncated C-terminus. Strain F38011 sequence differs due to a recombination event that leads to a 68-bp deletion producing a stop codon at position 544.