A kinesin-3 recruitment complex facilitates axonal sorting of enveloped alpha herpesvirus capsids. Author Julian Scherer, Ian Hogue, Zachary Yaffe, Nikhila Tanneti, Benjamin Winer, Michael Vershinin, Lynn Enquist Publication Year 2020 Type Journal Article Abstract Axonal sorting, the controlled passage of specific cargoes from the cell soma into the axon compartment, is critical for establishing and maintaining the polarity of mature neurons. To delineate axonal sorting events, we took advantage of two neuroinvasive alpha-herpesviruses. Human herpes simplex virus 1 (HSV-1) and pseudorabies virus of swine (PRV; suid herpesvirus 1) have evolved as robust cargo of axonal sorting and transport mechanisms. For efficient axonal sorting and subsequent egress from axons and presynaptic termini, progeny capsids depend on three viral membrane proteins (Us7 (gI), Us8 (gE), and Us9), which engage axon-directed kinesin motors. We present evidence that Us7-9 of the veterinary pathogen pseudorabies virus (PRV) form a tripartite complex to recruit Kif1a, a kinesin-3 motor. Based on multi-channel super-resolution and live TIRF microscopy, complex formation and motor recruitment occurs at the trans-Golgi network. Subsequently, progeny virus particles enter axons as enveloped capsids in a transport vesicle. Artificial recruitment of Kif1a using a drug-inducible heterodimerization system was sufficient to rescue axonal sorting and anterograde spread of PRV mutants devoid of Us7-9. Importantly, biophysical evidence suggests that Us9 is able to increase the velocity of Kif1a, a previously undescribed phenomenon. In addition to elucidating mechanisms governing axonal sorting, our results provide further insight into the composition of neuronal transport systems used by alpha-herpesviruses, which will be critical for both inhibiting the spread of infection and the safety of herpesvirus-based oncolytic therapies. Keywords Animals, Humans, Protein Binding, Axons, Host-Pathogen Interactions, Capsid, Herpesvirus 1, Human, Herpesvirus 1, Suid, Pseudorabies, Herpes Simplex, Swine, Viral Envelope Proteins, Axonal Transport, trans-Golgi Network, Kinesins Journal PLoS Pathog Volume 16 Issue 1 Pages e1007985 Date Published 2020 Jan ISSN Number 1553-7374 DOI 10.1371/journal.ppat.1007985 Alternate Journal PLoS Pathog PMCID PMC7010296 PMID 31995633 PubMedPubMed CentralGoogle ScholarBibTeXEndNote X3 XML