Enterobacterial TraT complement resistance / Enterobacterial TraT complement resistance protein / cell outer membrane / Prokaryotic membrane lipoprotein lipid attachment site profile. / TraT complement resistance protein
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/M011178/1
英国
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: Cryo-EM structure and evolutionary history of the conjugation surface exclusion protein TraT. 著者: Chloe Seddon / Sophia David / Joshua L C Wong / Naito Ishimoto / Shan He / Jonathan Bradshaw / Wen Wen Low / Gad Frankel / Konstantinos Beis / 要旨: Conjugation plays a major role in dissemination of antimicrobial resistance genes. Following transfer of IncF-like plasmids, recipients become refractory to a second wave of conjugation with the same ...Conjugation plays a major role in dissemination of antimicrobial resistance genes. Following transfer of IncF-like plasmids, recipients become refractory to a second wave of conjugation with the same plasmid via entry (TraS) and surface (TraT) exclusion mechanisms. Here, we show that TraT from the pKpQIL and F plasmids (TraT and TraT) exhibits plasmid surface exclusion specificity. The cryo-EM structures of TraT and TraT reveal that they oligomerise into decameric champagne bottle cork-like structures, which are anchored to the outer membrane via a diacylglycerol and palmitic acid modified α-helical barrel domain. Unexpectedly, we identify chromosomal TraT homologues from multiple Gram-negative phyla which form numerous divergent lineages in a phylogenetic tree of TraT sequences. Plasmid-associated TraT sequences are found in multiple distinct lineages, including two separate clades incorporating TraT from Enterobacteriaceae IncF/F-like and Legionellaceae F-like plasmids. These findings suggest that different plasmid backbones have acquired and co-opted TraT on independent occasions.