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J Virol. 1994 March; 68(3): 1812-1818

Analysis of the signals for polarized transport of influenza virus (A/WSN/33) neuraminidase and human transferrin receptor, type II transmembrane proteins.

A Kundu and D P Nayak

Jonsson Comprehensive Cancer Center, University of California at Los Angeles 90024-1747.

ABSTRACT

In polarized MDCK cells influenza virus (A/WSN/33) neuraminidase (NA) and human transferrin receptor (TR), type II glycoproteins, when expressed from cloned cDNAs, were transported and accumulated preferentially on the apical and basolateral surfaces, respectively. We have investigated the signals for polarized sorting by constructing chimeras between NA and TR and by making deletion mutants. NATR delta 90, which contains the cytoplasmic tail and transmembrane domain of NA and the ectodomain of TR, was found to be localized predominantly on the apical membrane, whereas TRNA delta 35, containing the cytoplasmic and transmembrane domains of TR and the ectodomain of NA, was expressed preferentially on the basolateral membrane. TR delta 57, a TR deletion mutant lacking 57 amino acids in the TR cytoplasmic tail, did not exhibit any polarized expression and was present on both apical and basolateral surfaces, whereas a deletion mutant (NA delta 28-35) lacking amino acid residues from 28 to 35 in the transmembrane domain of NA resulted in secretion of the NA ectodomain predominantly from the apical side. These results taken together indicate that the cytoplasmic tail of TR was sufficient for basolateral transport, but influenza virus NA possesses two sorting signals, one in the cytoplasmic or transmembrane domain and the other within the ectodomain, both of which are independently able to transport the protein to the apical plasma membrane.

J Virol. 1994 March; 68(3): 1812-1818




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