ジャーナル: Sci Adv / 年: 2024 タイトル: Archaeal type six secretion system mediates contact-dependent antagonism. 著者: Tobias Zachs / Jessie James L Malit / Jingwei Xu / Alexandra Schürch / Shamphavi Sivabalasarma / Phillip Nußbaum / Sonja-Verena Albers / Martin Pilhofer / 要旨: Microbial communities are shaped by cell-cell interactions. Although archaea are often found in associations with other microorganisms, the mechanisms structuring these communities are poorly ...Microbial communities are shaped by cell-cell interactions. Although archaea are often found in associations with other microorganisms, the mechanisms structuring these communities are poorly understood. Here, we report on the structure and function of haloarchaeal contractile injection systems (CISs). Using a combination of functional assays and time-lapse imaging, we show that exhibits antagonism toward by inducing cell lysis and inhibiting proliferation. This antagonism is contact-dependent and requires a functional CIS, which is encoded by a gene cluster that is associated with toxin-immunity pairs. Cryo-focused ion beam milling and imaging by cryo-electron tomography revealed that these CISs are bound to the cytoplasmic membrane, resembling the bacterial type six secretion systems (T6SSs). We show that related T6SS gene clusters are conserved and expressed in other haloarchaeal strains, which exhibit antagonistic behavior. Our data provide a mechanistic framework for understanding how archaea may shape microbial communities and affect the food webs they inhabit.
想定した対称性 - 点群: C6 (6回回転対称) / 解像度のタイプ: BY AUTHOR / 解像度: 60.0 Å / 解像度の算出法: OTHER 詳細: The resolution was not determined due to the poor contrast of tomograms, which resulted from high intracellular salt concentration. 使用したサブトモグラム数: 4518