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J. Virol., 09 1996, 6508-6515, Vol 70, No. 9
A Kundu, RT Avalos, CM Sanderson and DP Nayak
The influenza virus neuraminidase (NA), a type II transmembrane protein, is
directly transported to the apical plasma membrane in polarized MDCK cells.
By using deletion mutants and chimeric constructs of influenza virus NA
with the human transferrin receptor, a type II basolateral transmembrane
protein, we investigated the location of the apical sorting signal of
influenza virus NA. When these mutant and chimeric proteins were expressed
in stably transfected polarized MDCK cells, the transmembrane domain of NA,
and not the cytoplasmic tail, provided a determinant for apical targeting
in polarized MDCK cells and this transmembrane signal was sufficient for
sorting and transport of the ectodomain of a reporter protein (transferrin
receptor) directly to the apical plasma membrane of polarized MDCK cells.
In addition, by using differential detergent extraction, we demonstrated
that influenza virus NA and the chimeras which were transported to the
apical plasma membrane also became insoluble in Triton X-100 but soluble in
octylglucoside after extraction from MDCK cells during exocytic transport.
These data indicate that the transmembrane domain of NA provides the
determinant(s) both for apical transport and for association with Triton
X-100-insoluble lipids.
Copyright © 1996, American Society for Microbiology
Transmembrane domain of influenza virus neuraminidase, a type II protein, possesses an apical sorting signal in polarized MDCK cells
Jonsson Comprehensive Cancer Center, Department of Microbiology and Immunology, University of California at Los Angeles 90095-1747, USA.
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