Mycobacterium Tuberculosis Infection

Mycobacterium tuberculosis infection causes tuberculosis, a chronic infectious disease primarily targeting the lungs. This acid-fast bacillus exhibits virulence through mechanisms enabling it to evade host immune destruction, leading to latent infection. It survives diverse host stressors—including acidic pH, hypoxia, immune responses, metal toxicity, and heat shock—by deploying specialized proteins and stress response systems. Key survival strategies include resistance to acidic and hypoxic conditions within macrophages, utilization of heat shock proteins (e.g., Hsp70, Hsp22.5, HspR, Acr2) for thermal tolerance, and acquisition of essential iron via siderophores like mycobactins and carboxymycobactins. These adaptations allow M. tuberculosis to persist and establish long-term infection in the human host.