Outer membrane protein transporter (None)

Outer membrane protein transporters are integral β-barrel proteins embedded in the outer membrane of Gram-negative bacteria and select organelles, responsible for the transport of nutrients, metals, antibiotics, toxins, and cellular signals between the external environment and the periplasmic space. They are the first line of contact with the host and environment, often mediating cell adhesion, signaling, and virulence factor activity. These proteins include general porins (allowing passive flux), substrate-specific transporters such as TonB-dependent receptors (that require energy-coupling to transfer large or scarce nutrients), and assembly proteins like those of the Omp85 superfamily (responsible for membrane protein insertion and folding). Changes or mutations in these transporters are strongly associated with antibiotic resistance, adaptation to hostile environments, and pathogenesis, making them significant drug targets and potential biomarkers of infection and therapeutic outcome. This entry describes a protein class/family, not a specific protein, so for structured use or therapeutic targeting, it is essential to specify the individual protein (e.g., "BtuB", "OmpA", "BamA", "LptD").

Other names

OMP transporterouter membrane transporter proteinporin (depending on the subtype)β-barrel outer membrane protein

Drugs may block substrate transport, inhibit protein folding/insertion (e.g., BAM complex inhibitors), or disrupt channel function to prevent nutrient uptake and waste export