Draft crystal structure of the vault shell at 9-A resolution.Anderson, D.H., Kickhoefer, V.A., Sievers, S.A., Rome, L.H., Eisenberg, D.
(2007) Plos Biol. 5: e318-e318
- PubMed: 18044992
- DOI: 10.1371/journal.pbio.0050318
- PubMed Abstract:
- Solution structure of a two-repeat fragment of major vault protein
Kozlov, G.,Vavelyuk, O.,Minailiuc, O.,Banville, D.,Gehring, K.,Ekiel, I.
(2006) J.Mol.Biol. 356: 444
- Cryoelectron Microscopy Imaging of Recombinant and Tissue Derived Vaults: Localization of the Mvp N Termini and Vparp
Mikyas, Y.,Makabi, M.,Raval-Fernandes, S.,Harrington, L.,Kickhoefer, V.A.,Rome, L.H.,Stewart, P.L.
(2004) J.Mol.Biol. 344: 91
Vaults are the largest known cytoplasmic ribonucleoprotein structures and may function in innate immunity. The vault shell self-assembles from 96 copies of major vault protein and encapsulates two other proteins and a small RNA. We crystallized rat l ...
Vaults are the largest known cytoplasmic ribonucleoprotein structures and may function in innate immunity. The vault shell self-assembles from 96 copies of major vault protein and encapsulates two other proteins and a small RNA. We crystallized rat liver vaults and several recombinant vaults, all among the largest non-icosahedral particles to have been crystallized. The best crystals thus far were formed from empty vaults built from a cysteine-tag construct of major vault protein (termed cpMVP vaults), diffracting to about 9-A resolution. The asymmetric unit contains a half vault of molecular mass 4.65 MDa. X-ray phasing was initiated by molecular replacement, using density from cryo-electron microscopy (cryo-EM). Phases were improved by density modification, including concentric 24- and 48-fold rotational symmetry averaging. From this, the continuous cryo-EM electron density separated into domain-like blocks. A draft atomic model of cpMVP was fit to this improved density from 15 domain models. Three domains were adapted from a nuclear magnetic resonance substructure. Nine domain models originated in ab initio tertiary structure prediction. Three C-terminal domains were built by fitting poly-alanine to the electron density. Locations of loops in this model provide sites to test vault functions and to exploit vaults as nanocapsules.
Howard Hughes Medical Institute, University of California Los Angeles, Los Angeles, California, United States of America.