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Revision as of 02:46, 16 October 2018



Project Results Banner Image


Purification of Arc Min and Arc Full

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Transmission Electron Microscopy

Transmission electron microscopy (TEM) confirmed the presence of spherical nanoparticles in both the full-length M. musculus Arc protein and minimal Arc Gag protein samples. Even in the absence of RNA cargo, the Arc-derived PNCs were capable of self-assembly in vitro. In both samples, the average PNC diameter was approximately 30nm +/- 10nm.


Full-Length Arc

TEM Full

TEM image (60,000X magnification) of negatively-stained self-assembled full-length Arc PNCs. Scale bar = 200um.

Minimal Arc Gag

TEM Arc Min

TEM image (100,000X magnification) of negatively-stained self-assembled minimal Arc Gag PNCs. Scale bar = 100um.



TEM also confirmed the presence of spherical nanoparticles in the P22 protein sample (without added scaffolding proteins; SPs) and P22 + SP-Cas9 protein samples. In the absence of the scaffolding protein, P22 capsid proteins were capable of self-assembly but with a significant variation in size and stability (many collapsed structures were evident in the sample). The P22 + SP-Cas9 PNCs had a much more consistent architecture but had a diameter of 120 +/- 5nm, which is approximately twice that of typical P22 virus-like particles. The 1:1 capsid to cargo ratio may have caused overloading of the PNCs, which caused an increase in overall size.


P22 coat proteins

TEM P22

TEM image (40,000X magnification) of negatively-stained self-assembled P22 capsids in the absence of scaffolding proteins. Scale bar = 200um.

P22-SP-Cas9

TEM P22-SP-Cas9

TEM image (40,000X magnification) of negatively-stained self-assembled P22 capsids with the SP-Cas9 cargo. Scale bar = 100um.



Mass Spectrometry

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Minimal Arc Gag

Mass Spec Arc Min

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P22 Capsid

Mass Spec P22

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Analytical Ultracentrifugation of Minimal Arc Gag

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Cell Culture Transfection with Minimal Arc Gag

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Purification of P22 and SP-Cas9

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Collaboration with the University of Calgary iGEM Team

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Improved Parts

We characterized 15 parts from the 2017 Lethbridge iGEM team's "Next Vivo" project. Please visit the Improved Parts page for links to the new registry pages and all related data.