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An Engineered Virus as a Bright Fluorescent Tag and Scaffold for Cargo Proteins—Capture and Transport by Gliding Microtubules

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We have demonstrated substantial capture and transport of fluorescently-labeled engineered cowpea mosaic virus (CPMV) using Drosophila kinesin-driven microtubules (MTs). The capture occurred through both NeutrAvidin (NA)-biotin and antibody (IgG)-antigen interactions. The MTs were derivatized with rabbit anti-chicken IgG or biotin, and the virus was conjugated with chicken IgG or NA. The CPMV conjugate was introduced into standard MT motility assays via convective flow at concentrations as high as 1.36 nM, and became bound to the MTs in densities as high as one virus per m of MT length. When the CPMV conjugate was present at 17 pM, the average speed of the MTs bearing the NA-virus was 0.59 ± 0.08 m/sec, and that of those bearing IgG-virus was 0.52 ± 0.15 m/sec. These speeds are comparable to those of the unladen MTs (0.61 ± 0.09 m/sec), the presence of the virus on the MT causing only a small decrease in MT gliding speeds. The fluorescent CPMV appears to be superior to fluorescent polystyrene spheres of the same size, as both a reporter tag and a scaffold for MT-transported cargo proteins, because of its negligible non-specific adsorption and superior brightness. This work is important for the development of sensors based on nanolocomotion and biological recognition, or new strategies for the nanoassembly of biological structures.
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Document Type: Research Article

Publication date: 2006-08-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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