Download MendeleySolution Structures of Engineered Vault Particles.
Ding, K., Zhang, X., Mrazek, J., Kickhoefer, V.A., Lai, M., Ng, H.L., Yang, O.O., Rome, L.H., Zhou, Z.H.(2018) Structure 26: 619-626.e3
- PubMed: 29551289
- DOI: https://doi.org/10.1016/j.str.2018.02.014
- Primary Citation of Related Structures:
6BP7, 6BP8 - PubMed Abstract:
Prior crystal structures of the vault have provided clues of its structural variability but are non-conclusive due to crystal packing. Here, we obtained vaults by engineering at the N terminus of rat major vault protein (MVP) an HIV-1 Gag protein segment and determined their near-atomic resolution (∼4.8 Å) structures in a solution/non-crystalline environment. The barrel-shaped vaults in solution adopt two conformations, 1 and 2, both with D39 symmetry. From the N to C termini, each MVP monomer has three regions: body, shoulder, and cap. While conformation 1 is identical to one of the crystal structures, the shoulder in conformation 2 is translocated longitudinally up to 10 Å, resulting in an outward-projected cap. Our structures clarify the structural discrepancies in the body region in the prior crystallography models. The vault's drug-delivery potential is highlighted by the internal disposition and structural flexibility of its Gag-loaded N-terminal extension at the barrel waist of the engineered vault.
Organizational Affiliation:
Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA 90095, USA; California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, Los Angeles, CA 90095, USA.
