National Natural Science Foundation of China (NSFC)
32371254
中国
National Natural Science Foundation of China (NSFC)
32171190
中国
引用
ジャーナル: Appl Environ Microbiol / 年: 2026 タイトル: Structural basis for the extended-spectrum antimicrobial activity of Garvieacin Q. 著者: Jinsong Duan / Dan Li / Yuqing Zhao / Jiawei Wang / 要旨: Class IIa and IId bacteriocins are antimicrobial peptides with potential for combating antibiotic-resistant pathogens. However, their species-specific activity, dictated by recognition of the mannose ...Class IIa and IId bacteriocins are antimicrobial peptides with potential for combating antibiotic-resistant pathogens. However, their species-specific activity, dictated by recognition of the mannose phosphotransferase system (Man-PTS) receptor, often restricts their spectrum. Garvieacin Q/Garvicin Q (GarQ), a newly identified class IId bacteriocin, is unusual in that it targets both and the non-lactococcal pathogen , yet the structural basis for this cross-species activity has remained unclear. Using cryo-electron microscopy, we determined the structures of GarQ bound to Man-PTS receptors from and . In , the receptor contains a unique Tudor-like γ+ domain that sterically constrains the N terminus of incoming bacteriocins, thereby enforcing specificity for GarQ while excluding others such as lactococcin A (LcnA). In , GarQ engages the receptor through the same conserved binding mode, effectively bypassing the unusual species barrier. We further demonstrate that the C-terminal length of GarQ is a critical determinant of pore size and target specificity. Together, these findings uncover the structural mechanism underlying GarQ's atypical extended-spectrum activity and provide a framework for engineering bacteriocins with customized spectra to combat specific pathogens.IMPORTANCEThis study establishes a structural basis for how the extended-spectrum bacteriocin Garvieacin Q (GarQ) circumvents the canonical species-specificity of class II bacteriocins by engaging mannose phosphotransferase system receptors from different bacterial genera through both conserved and divergent binding modes. We identify a previously unknown Tudor-like γ+ domain in the receptor that sterically restricts the access of other bacteriocins, thereby defining bacteriocin specificity. Moreover, we demonstrate that the C-terminal length of GarQ critically determines pore size and bacterial targets, revealing an engineerable principle for designing synthetic bacteriocins with customized spectra against clinically relevant pathogens.