Bacterial outer membrane protein assembly machinery (BAM complex) and phage-shock protein A (PspA) (BAM complex, PspA)

Bacterial cell membrane integrity proteins encompass various factors essential for maintaining and assembling the structure of the bacterial cell envelope, particularly in Gram-negative organisms. Key representatives include the β-barrel assembly machinery complex (BAM complex), responsible for the insertion and assembly of major outer membrane proteins (OMPs), and proteins such as phage-shock protein A (PspA), which stabilize membranes in response to stress. The BAM complex operates by recognizing β-barrel motifs and signals in nascent OMPs and orchestrating their incorporation into the outer membrane; disruption of this complex leads to loss of membrane integrity and ultimately cell death. PspA and related proteins act by stabilizing the inner membrane during envelope stress, forming oligomeric structures or protective layers to prevent proton leakage and maintain membrane potential. Together, these molecular systems are critical for bacterial viability, virulence, and resistance to antibiotics and environmental insults; thus, they are considered highly attractive but challenging therapeutic targets for novel antibacterial agents[1][2][3].

Other names

Outer membrane β-barrel assembly machineryBamA/B/B/C/D/E (for BAM complex)Phage-shock protein APspA family

Inhibition of BAM complex disrupts assembly of essential outer membrane proteins, compromising membrane integrity[1] Antimicrobial peptides insert into membranes, forming pores or causing localized disruptions[2]