pfam11382: MctB (This model is not part of the current CDD release)
Copper transport outer membrane protein, MctB
Outer membrane channel protein MctB in Mycobacterium tuberculosis is part of a Cu resistance mechanism that ensures low intracellular Cu levels in the bacterium. Human resistance to bacteria, mediated via IFN-gamma-mediated activation of macrophages, may involve the use of reactive Cu(1) in the presence of hydrogen peroxide, since activated Cu is toxic to bacteria. IFN-gamma stimulates the trafficking of the Cu transporter ATP7a to the vesicles that fuse with phagosome and these phagosomes are found to have a high Cu content and an increased bactericidal activity against E.coli. Using MctB, Mycobacterium tuberculosis may limit the amount of excess Cu within it whole in the host.
Jiyao W et al.(2023). "The conserved domain database in 2023.",