9XCM
Cryo-EM structure of Ceg14-AnkJ-Actin complex
Summary for 9XCM
| Entry DOI | 10.2210/pdb9xcm/pdb |
| EMDB information | 66735 |
| Descriptor | Actin, Ceg14, AnkJ, ... (4 entities in total) |
| Functional Keywords | legionella, ceg14, ankj, actin, cell invasion |
| Biological source | Lepus More |
| Total number of polymer chains | 3 |
| Total formula weight | 149280.18 |
| Authors | |
| Primary citation | Guan, H.,Li, Y.,Zhang, L.,Xie, S.,Jiang, Y.,He, C.,Li, F.,Jiao, Y.D.,Gan, M.,Sha, Y.,Zheng, F.,Zhang, K.,Luo, Z.Q.,Lai, Q.,Su, J.,Xia, N.,Zheng, Q.,Li, J.,Li, S.,Ouyang, S. Molecular basis of host ATP level modulation by actin-dependent secreted bacterial ATPase and its metaeffector. Nat Commun, 17:-, 2026 Cited by PubMed Abstract: Legionella pneumophila employs effectors including kinases, phosphoryl-AMPylases, ATPases, etc. to exploit host ATP for infection. Ceg14, a member of the S-HxxxE family, modulates host-cell energy levels in concert with host actin and the metaeffector AnkJ: actin activates while AnkJ inhibits Ceg14 ATPase activity. However, the molecular basis of this regulation remains unclear. Here we present Cryo-EM structures of Ceg14-actin, Ceg14-AnkJ, and Ceg14-actin-AnkJ complexes at 2.89 Å, 2.93 Å, and 2.52 Å, respectively. Actin binds to the C-terminal α-helix of the Ceg14 catalytic domain (CD), inducing rearrangement of its N-terminal domain (NTD) and reconfiguration of the flexible Lid domain. Surprisingly, AnkJ binds to the surface opposite the catalytic pocket rather than occupying the pocket. Using integrated in silico, in vitro, and in cellulo approaches, we propose a mechanism for Ceg14-mediated ATP hydrolysis. Actin binding triggers NTD rotation, driving the catalytic pocket through open, intermediate, and closed states. In the open state, H571 catalyzes ATP conversion to AMP and PPi. AnkJ binding to an allosteric site locks the intermediate state, thereby inhibiting hydrolysis. Together, our study reveals the molecular mechanism by which actin and AnkJ reciprocally regulate Ceg14 activity. PubMed: 42331848DOI: 10.1038/s41467-026-74513-y PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (2.52 Å) |
Structure validation
No wwPDB Validation report is currently available for this entry.
