Encapsulation of Semiconducting Polymers in Vault Protein Cages

• Published in: Nano letters 2008-10, Vol.8 (10), p.3503-3509
• Main Authors: Ng, Benny C, Yu, Marcella, Gopal, Ajaykumar, Rome, Leonard H, Monbouquette, Harold G, Tolbert, Sarah H
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; DNA - chemistry; Drug Carriers; Drug Delivery Systems; Exact sciences and technology; Genetic Therapy - methods; Humans; Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties; Materials science; Methods of nanofabrication; Microscopy, Electron, Transmission; Models, Statistical; Nanocapsules - chemistry; Nanocomposites - chemistry; Physics; Polymers - chemistry; Proteins - chemistry; Self-assembly; Semiconductors; Spectrometry, Fluorescence - methods; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); X-Rays
• ISSN: 1530-6984; 1530-6992
• DOI: 10.1021/nl080537r

We demonstrate that a semiconducting polymer [poly(2-methoxy-5-propyloxy sulfonate phenylene vinylene), MPS-PPV] can be encapsulated inside recombinant, self-assembling protein nanocapsules called “vaults”. Polymer incorporation into these nanosized protein cages, found naturally at ∼10,000 copies per human cell, was confirmed by fluorescence spectroscopy and small-angle X-ray scattering. Although vault cellular functions and gating mechanisms remain unknown, their large internal volume and natural prevalence within the human body suggests they could be used as carriers for therapeutics and medical imaging reagents. This study provides the groundwork for the use of vaults in encapsulation and delivery applications.