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. 1993 Jul;67(7):3786–3797. doi: 10.1128/jvi.67.7.3786-3797.1993

Specific pseudorabies virus infection of the rat visual system requires both gI and gp63 glycoproteins.

M E Whealy 1, J P Card 1, A K Robbins 1, J R Dubin 1, H J Rziha 1, L W Enquist 1
PMCID: PMC237743  PMID: 8389905

Abstract

Transneuronal transport of pseudorabies virus (PRV) from the retina to visual centers that mediate visual discrimination and reflexes requires specific genes in the unique short region of the PRV genome. In contrast, these same viral genes are not required to infect retinorecipient areas of the brain involved in circadian rhythm regulation. In this report, we demonstrate that viral mutants carrying defined deletions of the genes encoding glycoprotein gI or gp63, or both, result in the same dramatic transport defect. Efficient export of either gI or gp63 from the endoplasmic reticulum to the Golgi apparatus in a fibroblast cell line requires the presence of both proteins. We also show that gI and gp63 physically interact, as demonstrated by pulse-chase and sucrose gradient sedimentation experiments. Complex formation is rapid compared with homodimerization of PRV glycoprotein gII. We suggest that gI and gp63 function in concert to affect neurotropism in the rat visual circuitry and that a heterodimer is likely to be the unit of function.

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