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. 1991 Oct 15;88(20):9117–9121. doi: 10.1073/pnas.88.20.9117

Biochemical characterization of murine glycosylation-inhibiting factor.

Y Tagaya 1, A Mori 1, K Ishizaka 1
PMCID: PMC52663  PMID: 1924374

Abstract

The glycosylation-inhibiting factor (GIF) was isolated from serum-free culture supernatants of the murine T-cell hybridoma, 231F1 cells, by using an immunosorbent coupled with the monoclonal anti-lipomodulin antibody. The isolated lymphokine is a 14-kDa protein with a pI of 5.5, as determined by SDS/PAGE and two-dimensional gel electrophoresis. Fractionation of a mixture of radiolabeled GIF with culture supernatant of the 231F1 cells on ion-exchange and reverse-phase columns and by gel filtration demonstrated homogeneity of the 14-kDa GIF and confirmed that the bioactivity of GIF and the antigenic determinant recognized by the monoclonal anti-GIF antibody are associated with the 14-kDa protein. The 125I-labeled 14-kDa protein binds to the murine T-cell hybridoma 12H5 cells, which have been used for bioassay of GIF, and the murine B-cell line A20.3 cells, but the binding of the protein to resting murine splenic lymphocytes was barely detectable. Under the same experimental conditions, binding of the 125I-labeled recombinant human lipocortin I to the 12H5 cells was not detectable. In contrast, the 125I-labeled lipocortin, but not the 14-kDa GIF, bound to phosphatidylserine vesicles. The results indicate that GIF does not belong to the anexin family.

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Selected References

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