Abstract
Asymmetrical-flow field flow fractionation with multiple-angle light scattering (AFFFF-MALS) was, for the first time, used to characterize the size of murine polyomavirus virus-like particles (MPV VLPs) packaged with either insect cell genomic DNA or non-viral protein. Encapsidation of both genomic DNA and non-viral protein were found to cause a contraction in VLP radii of gyration by approximately 1 nm. Non-viral protein packaged into VLPs consisted of a series of glutathione-S-transferase, His and S tags attached to the N-terminal end of the MPV structural protein VP2 (M r = 67108). Transmission electron microscopy analysis of MPV VLPs packaging non-viral protein suggested that VLPs grew in diameter by approximately 5 nm, highlighting the differences between this invasive technique and the relatively non-invasive AFFFF-MALS technique. Encapsulation of non-viral protein into MPV VLPs was found to prevent co-encapsidation of genomic DNA. Further investigation into why this occurred led to the discovery that encapsulation of non-viral protein alters the nuclear localization of MPV VLPs during in vivo assembly. VLPs were relocated away from the ring zone and the nuclear membrane towards the centre of the nucleus amongst the virogenic stroma. The change in nuclear localization away from the site where VLP assembly usually occurs is a likely reason why encapsidation of genomic DNA did not take place.
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Abbreviations
- AcMNPV:
-
Autographa californica multiple nucleopolyhedrovirus
- AFFFF:
-
Asymmetrical-flow field flow fractionation
- ELISA:
-
Enzyme-linked immunosorbent assay
- GST:
-
Glutathione-S-transferase
- His:
-
Polyhistidine tag
- MALS:
-
Multiple-angle light scattering
- MOI:
-
Multiplicity of infection
- MPV:
-
Murine polyomavirus
- p.i.:
-
Post-infection
- RI:
-
Refractive index
- S:
-
S Tag (EMD Biosciences, Inc., Madison, WI, USA)
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- TAG:
-
Sequence of glutathione-S-transferase, His and S tags from pET-41a(+) vector (EMD Biosciences, Inc.)
- TEM:
-
Transmission electron microscopy
- VLP:
-
Virus-like particle
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Acknowledgments
L. H. L. L. and A. P. J. M. acknowledge the support of the Australian Research Council (Grants FF0348465 and DP0773111) and the Australian National Health and Medical Research Council (Grant 409976). D. I. L. is a recipient of University of Queensland Graduate School and Center for Biomolecular Engineering scholarships. A. P. J. M. acknowledges support from the Australian Research Council through the award of a Federation Fellowship. Y. P. C. is a recipient of Australian Postgraduate Award and Australian Institute of Bioengineering and Nanotechnology scholarships.
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Lipin, D.I., Chuan, Y.P., Lua, L.H.L. et al. Encapsulation of DNA and non-viral protein changes the structure of murine polyomavirus virus-like particles. Arch Virol 153, 2027–2039 (2008). https://doi.org/10.1007/s00705-008-0220-9
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DOI: https://doi.org/10.1007/s00705-008-0220-9