Competitors versus Collaborators: Micronutrient Processing by Pathogenic and Commensal Human-Associated Gut Bacteria

Co-evolution of gut commensal bacteria and humans has ensured that the micronutrient needs of both parties are met. This minireview summarizes the known molecular mechanisms of iron, zinc, and B vitamin processing by human-associated bacteria, comparing gut pathogens and commensals, and highlights the tension between their roles as competitors versus collaborators with the human host.