The cellular receptor for poliovirus CD155 (or PVR) is the founding member of a new class of membrane-associated immunoglobulin-like proteins, which include the mouse tumor-associated antigen E4 (Tage4) and three proteins termed "nectins." Using a yeast two-hybrid screen we have discovered that the cytoplasmic domain of CD155 associates strongly and specifically with Tctex-1, a light chain of the dynein motor complex, the latter representing the major driving force for retrograde transport of endocytic vesicles and membranous organelles. We confirmed the interaction biochemically and by co-immunoprecipitation, and we mapped the Tctex-1 binding site to a SKCSR motif within the juxtamembrane region of CD155. Tctex-1 immunoreactivity was detected in mouse sciatic nerve and spinal cord (two tissues of central importance for poliovirus pathogenesis) in punctate, possibly vesicular, patterns. We propose that the cytoplasmic domain may target CD155-containing endocytic vesicles to the microtubular network. Neurotropic viruses like poliovirus, herpesvirus, rabies virus, and pseudorabies virus all utilize neuronal retrograde transport to invade the central nervous system. Association with Tctex-1 and, hence, with the dynein motor complex may offer an explanation for how poliovirus hijacks the cellular transport machinery to retrogradely ascend along the axon to the neuronal cell body.
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