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The Scripps Research Institute, Departments of Cell and Molecular Biology, La Jolla, California 92037
p53/58 is a transmembrane protein that continuously recycles between the ER and pre-Golgi intermediates composed of vesicular-tubular clusters
(VTCs) found in the cell periphery and at the cis face of
the Golgi complex. We have generated an antibody
that uniquely recognizes the p53/58 cytoplasmic tail.
Here we present evidence that this antibody arrests the
anterograde transport of vesicular stomatitis virus glycoprotein and leads to the accumulation of p58 in preGolgi intermediates. Consistent with a role for the KKXX retrieval motif found at the cytoplasmic carboxyl terminus of p53/58 in retrograde traffic, inhibition of transport through VTCs correlates with the ability of the antibody to block recruitment of COPI coats
to the p53/58 cytoplasmic tail and to p53/58-containing membranes. We suggest that p53/58 function may be
required for the coupled exchange of COPII for COPI
coats during segregation of anterograde and retrograde
transported proteins.
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