Download MendeleyMechanism of regulation of the Helicobacter pylori Cag beta ATPase by CagZ.
Wu, X., Zhao, Y., Zhang, H., Yang, W., Yang, J., Sun, L., Jiang, M., Wang, Q., Wang, Q., Ye, X., Zhang, X., Wu, Y.(2023) Nat Commun 14: 479-479
- PubMed: 36717564
- DOI: https://doi.org/10.1038/s41467-023-36218-4
- Primary Citation of Related Structures:
8DOL - PubMed Abstract:
The transport of the CagA effector into gastric epithelial cells by the Cag Type IV secretion system (Cag T4SS) of Helicobacter pylori (H. pylori) is critical for pathogenesis. CagA is recruited to Cag T4SS by the Cagβ ATPase. CagZ, a unique protein in H. pylori, regulates Cagβ-mediated CagA transport, but the underlying mechanisms remain unclear. Here we report the crystal structure of the cytosolic region of Cagβ, showing a typical ring-like hexameric assembly. The central channel of the ring is narrow, suggesting that CagA must unfold for transport through the channel. Our structure of CagZ in complex with the all-alpha domain (AAD) of Cagβ shows that CagZ adopts an overall U-shape and tightly embraces Cagβ. This binding mode of CagZ is incompatible with the formation of the Cagβ hexamer essential for the ATPase activity. CagZ therefore inhibits Cagβ by trapping it in the monomeric state. Based on these findings, we propose a refined model for the transport of CagA by Cagβ.
Organizational Affiliation:
Provincial University Key Laboratory of Cellular Stress Response and Metabolic Regulation, Fujian Key Laboratory of Developmental and Neural Biology, Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, College of Life Sciences, Fujian Normal University, Fuzhou, 350117, Fujian, China.
