Interaction of poxvirus intracellular mature virion proteins with the TPR domain of kinesin light chain in live infected cells revealed by two-photon-induced fluorescence resonance energy transfer fluorescence lifetime imaging microscopy.
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Accepted version
Author(s)
Type
Journal Article
Abstract
Using two-photon-induced fluorescence lifetime imaging microscopy, we corroborate an interaction (previously demonstrated by yeast two-hybrid domain analysis) of full-length vaccinia virus (VACV; an orthopoxvirus) A36 protein with the cellular microtubule motor protein kinesin. Quenching of enhanced green fluorescent protein (EGFP), fused to the C terminus of VACV A36, by monomeric red fluorescent protein (mDsRed), fused to the tetratricopeptide repeat (TPR) domain of kinesin, was observed in live chicken embryo fibroblasts infected with either modified vaccinia virus Ankara (MVA) or wild-type fowlpox virus (FWPV; an avipoxvirus), and the excited-state fluorescence lifetime of EGFP was reduced from 2.5 ± 0.1 ns to 2.1 ± 0.1 ns due to resonance energy transfer to mDsRed. FWPV does not encode an equivalent of intracellular enveloped virion surface protein A36, yet it is likely that this virus too must interact with kinesin to facilitate intracellular virion transport. To investigate possible interactions between innate FWPV proteins and kinesin, recombinant FWPVs expressing EGFP fused to the N termini of FWPV structural proteins Fpv140, Fpv168, Fpv191, and Fpv198 (equivalent to VACV H3, A4, p4c, and A34, respectively) were generated. EGFP fusions of intracellular mature virion (IMV) surface protein Fpv140 and type II membrane protein Fpv198 were quenched by mDsRed-TPR in recombinant FWPV-infected cells, indicating that these virion proteins are found within 10 nm of mDsRed-TPR. In contrast, and as expected, EGFP fusions of the IMV core protein Fpv168 did not show any quenching. Interestingly, the p4c-like protein Fpv191, which demonstrates late association with preassembled IMV, also did not show any quenching.
Date Issued
2010-12
Citation
Journal of Virology, 2010, 84 (24), pp.12886-12894
ISSN
1098-5514
Publisher
American Society for Microbiology
Start Page
12886
End Page
12894
Journal / Book Title
Journal of Virology
Volume
84
Issue
24
Copyright Statement
© 2010, American Society for Microbiology
Identifier
PII: JVI.01395-10
Subjects
Animals
Chick Embryo
Fibroblasts
Fluorescence Resonance Energy Transfer
Fluorescent Antibody Technique
Green Fluorescent Proteins
Humans
Luminescent Proteins
Microscopy, Fluorescence
Microtubule-Associated Proteins
Photons
Plasmids
Poxviridae
Poxviridae Infections
Viral Proteins
Viral Structural Proteins
Virion
Notes
PMCID: PMC3004322
Publication Status
Published
Coverage Spatial
United States