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A unique glycoprotein containing GR-mouse mammary tumor virus peptides and additional peptides unrelated to viral structural proteins.

Abstract：

:A glycoprotein of molecular weight 130,000 (gP130) has been precipitated from the cytoplasm of GR-strain mouse mammary tumor (GR-MMT) cells by a rabbit antiserum (anti-MMTV) to GR-strain mouse mammary tumor virus (GR-MMTV). This protein was not precipitated by antisera specific for detergent-disrupted C3H-strain MMTV (C3H-MMTV); C3H-MMTV glycoproteins; C3H-MMTV nonglycosylated proteins; GR-MMTV p25 or p12; RIII strain (milk) MMTV proteins; or Rauscher murine leukemia virus (R-MuLV) proteins; nor was it precipitated by normal rabbit serum. Two-dimensional thin layer analysis of 35S-methionine-containing tryptic peptides revealed that five of nine gp33 peptides and one of seven gp55 peptides are shared by gP130 and gPr76env. The envelope protein precursor, gPr76env, contains all of the gp33 peptides and six of seven gp55 peptides. One peptide in gPr76env, possibly a gp55-gp33 junction peptide, is also apparently present in gP130. Six of ten p25 peptides and four more gag-related peptides are shared by PR78gag and gP130. Protein gP130 also contains several tryptic peptides not found in gPr76env or in the core protein precursors Pr78gag, Pr110gag or Pr180gag-pol. Radioimmunoprecipitation experiments showed that gP130 could be precipitated from extracts of GR-MMTV cells with anti-MMTV serum even after antibodies to the known MMTV structural proteins had been removed from the serum by absorption. Both gP130 and a second protein, p30, were found in immunoprecipitates of detergent-disrupted isotopically labeled GR-MMTV treated with the absorbed anti-MMTV serum. These results suggest that antibodies to gP130 in the anti-MMTV serum are capable of recognizing those protein sequences unique to gP130; that is, those protein sequences which are not related to viral structural proteins. In light of these data and data published previously, gP130 is apparently a polyprotein containing juxtaposed components translated from the 5' and 3' end of the MMTV genome and protein components not previously identified as virus-specific.

journal_name

Cell

journal_title

Cell

authors

Anderson SJ,Naso RB

doi

10.1016/0092-8674(80)90447-x

subject

Has Abstract

pub_date

1980-10-01 00:00:00

pages

837-47

issue

3

eissn

0092-8674

issn

1097-4172

pii

0092-8674(80)90447-X

journal_volume

21

pub_type

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