Colorful virus-like particles: Fluorescent protein packaging by the Qβl capsid

Jin Kyu Rhee, Marisa Hovlid, Jason D. Fiedler, Steven D. Brown, Florian Manzenrieder, Hiroaki Kitagishi, Corwin Nycholat, James C. Paulson, M. G. Finn

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Qβ virus-like particles encapsulating multiple copies of fluorescent proteins were generated in high yields using a modular system enhanced by specific engineered RNA-protein interactions. The resulting particles were structurally indistinguishable from recombinant Qβ alone. The encapsidated proteins were nearly identical in photochemical properties to monomeric analogues, were more stable toward thermal degradation, and were protected from proteolytic cleavage. Residues on the outer capsid surface were chemically derivatized by acylation and azide-alkyne cycloaddition without affecting the fluorescence properties of the packaged proteins. A high-affinity carbohydrate-based ligand of the CD22 receptor was thereby attached, and specific cell labeling by the particles was successfully detected by flow cytometry and confocal laser microscopy.

Original languageEnglish
Pages (from-to)3977-3981
Number of pages5
JournalBiomacromolecules
Volume12
Issue number11
DOIs
StatePublished - 14 Nov 2011

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