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Structural characterization of site-modified nanocapsid with monodispersed gold clusters.

Abstract：

:Hepatitis E Virus-like particles self-assemble in to noninfectious nanocapsids that are resistant to proteolytic/acidic mucosal delivery conditions. Previously, the nanocapsid was engineered to specifically bind and enter breast cancer cells, where successful tumor targeting was demonstrated in animal models. In the present study, the nanocapsid surface was modified with a solvent-exposed cysteine to conjugate monolayer protected gold nanoclusters (AuNC). Unlike commercially available gold nanoparticles, AuNCs monodisperse in water and are composed of a discrete number of gold atoms, forming a crystalline gold core. Au102 pMBA44 (Au102) was an ideal conjugate given its small 2.5 nm size and detectability in cryoEM. Au102 was bound directly to nanocapsid surface cysteines via direct ligand exchange. In addition, Au102 was functionalized with a maleimide linker (Au102_C6MI) for maleimide-thiol conjugation to nanocapsid cysteines. The AuNC-bound nanocapsid constructs were conjugated in various conditions. We found Au102_C6MI to bind nanocapsid more efficiently, while Au102 remained more soluble over time. Nanocapsids conjugated to Au102_C6MI were imaged in cryoEM for single particle reconstruction to localize AuNC position on the nanocapsid surface. We resolved five unique high intensity volumes that formed a ring-shaped density at the 5-fold symmetry center. This finding was further supported by independent rigid modeling.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Stark MC,Baikoghli MA,Lahtinen T,Malola S,Xing L,Nguyen M,Nguyen M,Sikaroudi A,Marjomäki V,Häkkinen H,Cheng RH

doi

10.1038/s41598-017-17171-x

subject

Has Abstract

pub_date

2017-12-06 00:00:00

pages

17048

issue

1

issn

2045-2322

pii

10.1038/s41598-017-17171-x

journal_volume

7

pub_type

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