Download MendeleyStructural insights into dynamics of the BMV TLS aminoacylation.
Yang, W., Yi, R., Yao, J., Gao, Y., Li, S., Gong, Q., Zhang, K.(2025) Nat Commun 16: 1276-1276
- PubMed: 39900568
- DOI: https://doi.org/10.1038/s41467-025-56612-4
- Primary Citation of Related Structures:
8ZMH, 8ZMI, 8ZMJ, 8ZMK - PubMed Abstract:
Brome Mosaic Virus (BMV) utilizes a tRNA-like structure (TLS) within its 3' untranslated region to mimic host tRNA functions, aiding aminoacylation and viral replication. This study explores the structural dynamics of BMV TLS interacting with tyrosyl-tRNA synthetase (TyrRS) during aminoacylation. Using cryo-EM, we capture multiple states of the TLS-TyrRS complex, including unbound TLS, pre-1a, post-1a, and catalysis states, with resolutions of 4.6 Å, 3.5 Å, 3.7 Å, and 3.85 Å, respectively. These structural comparisons indicate dynamic changes in both TLS and TyrRS. Upon binding, TLS undergoes dynamic rearrangements, particularly with helices B3 and E pivoting, mediated by the unpaired A36 residue, ensuring effective recognition by TyrRS. The dynamic changes also include a more compact arrangement in the catalytic center of TyrRS and the insertion of 3' CCA end into the enzyme's active site, facilitating two-steps aminoacylation. Enzymatic assays further demonstrated the functional importance of TLS-TyrRS interactions, with mutations in key residues significantly impacting aminoacylation efficiency. Furthermore, Electrophoretic Mobility Shift Assay (EMSA) demonstrated that BMV TLS binds elongation factors EF1α and EF2, suggesting a multifaceted strategy to exploit host translational machinery. These findings not only enhance our knowledge of virus-host interactions but also offer potential targets for antiviral drug development.
Organizational Affiliation:
Department of Clinical Laboratory, The First Affiliated Hospital of USTC, MOE Key Laboratory for Cellular Dynamics, Center for Advanced Interdisciplinary Science and Biomedicine of IHM, The RNA Institute, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.
