Abstract
In this report we show that the tendency of certain viruses to carry host membrane proteins in their envelopes can be harnessed for transplantation of small patches of plasma membrane, including fully functional, polytopic ion channel proteins and their regulatory binding partners. As a stringent model we tested the topologically complex epithelial ion channel CFTR. Initially an attenuated vaccinia virus was found capable of transferring CFTR in a properly folded, functional and regulatable form to CFTR negative cells. Next we generated viruslike particles (VLPs) composed of retroviral structural proteins that assemble and bud at the host cell plasma membrane. These particles were also shown to mediate functional ion channel transfer. By testing the capacity of complex membrane proteins to incorporate into viral envelopes these experiments provide new insight into the permissiveness of viral envelopment, including the ability of incorporated proteins to retain function and repair defects at the cell surface, and serve as a platform for studies of ion channel and membrane protein biochemistry.
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Abbreviations
- CFTR :
-
Cystic fibrosis transmembrane conductance regulator
- EMV :
-
Extracellular mature virus
- ER :
-
Endoplasmic reticulum
- IMV :
-
Intracellular mature virus
- MOI :
-
Multiplicity of infection
- PKA :
-
Protein kinase A
- RSV :
-
Rous sarcoma virus
- VLP :
-
Viruslike particle
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Acknowledgements
We thank Drs. Chris Yun and Mark Donowitz (Johns Hopkins University) for providing E3KARP antibody, Drs. Kevin Kirk and Estelle Cormet-Boyaka (University of Alabama at Birmingham) for providing SNAP-23 antibody, and Dr. Min Li (Johns Hopkins University) for antibody to CAP70. We also thank John Wills for pMyr1a construct, Eddie Walthall, Zsuzsa Bebok, and Susan Dubay for assistance and discussions, Leigh Millican at the University of Alabama at Birmingham Electron Microscopy Core, and Mrs. Mikelle Foster for help in manuscript preparation. This work is supported by the NIH and CFF.
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Curlee, K.V., Hong, J.S., Clancy, J.P. et al. Membrane transplantation to correct integral membrane protein defects. J Mol Med 81, 511–520 (2003). https://doi.org/10.1007/s00109-003-0446-7
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DOI: https://doi.org/10.1007/s00109-003-0446-7