Quantitation of MoMuLV envelope protein on the cell surface.

Abstract:

:The envelope glycoprotein (Env) of Moloney murine leukemia virus (MoMuLV) is proteolytically processed and transported to the cell surface where it can be incorporated into budding virions. Cell surface Env is frequently detected using an indirect immunofluorescence assay and fluorescence-activated cell sorting (FACS). We found that the detection of Env in this manner requires the expression of the MoMuLV receptor (ATRC-1) on the cell surface, and the level of envelope protein detected correlates with the level of receptors expressed on the cell. In addition, Env detection corresponds to the Env protein's ability to bind to its receptor and can be competed out by the addition of a truncated form of the Env protein. These data suggest that Env detected on the cell surface by the FACS assay is protein that has rebound to its receptor after being secreted or shed, rather than actual surface-expressed protein. In contrast, a combined immunoprecipitation and biotinylation assay detected equal amounts of Env on the surface of both receptor-lacking and receptor-expressing cell lines. The immunoprecipitation-biotinylation assay is therefore a more appropriate method for detecting surface expression of the MoMuLV envelope protein.

journal_name

Virology

journal_title

Virology

authors

Yu H,Empig C,Xia J,Anderson WF

doi

10.1006/viro.1998.9073

subject

Has Abstract

pub_date

1998-04-10 00:00:00

pages

415-22

issue

2

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(98)99073-0

journal_volume

243

pub_type

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