title: Cryo-electron tomography investigation of serum albumin-camouflaged tobacco mosaic virus nanoparticles.
abstract: Nanoparticles offer great potential in drug delivery and imaging, but shielding strategies are necessary to increase circulation time and performance. Structure-function studies are required to define the design rules to achieve effective shielding. With several formulations reaching clinical testing and approval, the ability to assess and detail nanoparticle formulations at the single particle level is becoming increasingly important. To address this need, we use cryo-electron tomography (cryo-ET) to investigate stealth-coated nanoparticles. As a model system, we studied the soft matter nanotubes formed by tobacco mosaic virus (TMV) coated with human serum albumin (SA) stealth proteins. Cryo-ET and subtomogram averaging allow for visualization of individual SA molecules and determination of their orientations relative to the TMV surface, and also for measurement of the surface coverage provided by added stealth proteins. This information fills a critical gap in the understanding of the structural morphology of stealth-coated nanoparticles, and therefore cryo-ET may play an important role in guiding the development of future nanoparticle-based therapeutics.
authors.affiliation: Department of Pharmacology, Case Western Reserve University, Cleveland, Ohio, USA. pls47@case.edu and Cleveland Center for Membrane and Structural Biology, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: Neetu M
authors.initials: NM
authors.lastname: Gulati
authors.affiliation: Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: Andrzej S
authors.initials: AS
authors.lastname: Pitek
authors.affiliation: Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA and Department of Radiology, Case Western Reserve University, Cleveland, Ohio, USA and Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio, USA and Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio, USA and Case Comprehensive Cancer Center, Division of General Medical Sciences-Oncology, Case Western Reserve University, Cleveland, Ohio, USA. nicole.steinmetz@case.edu.
authors.forename: Nicole F
authors.initials: NF
authors.lastname: Steinmetz
authors.affiliation: Department of Pharmacology, Case Western Reserve University, Cleveland, Ohio, USA. pls47@case.edu and Cleveland Center for Membrane and Structural Biology, Case Western Reserve University, Cleveland, Ohio, USA.
authors.forename: Phoebe L
authors.initials: PL
authors.lastname: Stewart
mesh_terms: D020285:Cryoelectron Microscopy; D055032:Electron Microscope Tomography; D006801:Humans; D053758:Nanoparticles; D043942:Nanotubes; D000075462:Serum Albumin, Human / Q000737:chemistry*; D014027:Tobacco Mosaic Virus
chemical_list: D000075462:Serum Albumin, Human