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Mol Cell Biol. 1989 November; 9(11): 4896-4902

Detection and characterization of the fibroblast growth factor-related oncoprotein INT-2.

Imperial Cancer Research Fund Laboratories, Lincoln's Inn Fields, London, United Kingdom.

ABSTRACT

Products of the fibroblast growth factor-related proto-oncogene int-2 have been detected by using a monoclonal antibody and polyclonal antisera raised against synthetic peptides predicted from the DNA sequence. COS-1 monkey cells transfected with int-2 DNA linked to the simian virus 40 early promoter contained at least four int-2-specific proteins, presumably representing modified forms of the expected 27-kilodalton primary translation product. The level of expression was increased approximately six- to eightfold by mutation of sequences around the presumed initiation codon, negating their capacity to encode a short oligopeptide in the +1 reading frame. Both tunicamycin inhibition and in vitro translation experiments indicated that some of the modifications correspond to asparagine-linked glycosylation, for which the sequence predicts a single site. In line with the similarities between INT-2 and other fibroblast growth factors, the in vitro translation products functioned as weak mitogens for mammary epithelial cells.

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