Abstract
Glycosylation inhibiting factor (GIF) and macrophage migration inhibitory factor (MIF) share an identical structure gene. Here we unravel two steps of posttranslational modifications in GIF/MIF molecules in human suppressor T (Ts) cell hybridomas. Peptide mapping and MS analysis of the affinity-purified GIF from the Ts cells revealed that one modification is cysteinylation at Cys-60, and the other is phosphorylation at Ser-91. Cysteinylated GIF, but not the wild-type GIF/MIF, possessed immunosuppressive effects on the in vitro IgE antibody response and had high affinity for GIF receptors on the T helper hybridoma cells. In vitro treatment of wild-type recombinant human GIF/MIF with cystine resulted in preferential cysteinylation of Cys-60 in the molecules. The cysteinylated recombinant human GIF and the Ts hybridoma-derived cysteinylated GIF were comparable both in the affinity for the receptors and in the immunosuppressive activity. Polyclonal antibodies specific for a stretch of the amino acid sequence in alpha2-helix of GIF bound bioactive cysteinylated GIF but failed to bind wild-type GIF/MIF. These results strongly suggest that cysteinylation of Cys-60 and consequent conformational changes in the GIF/MIF molecules are responsible for the generation of GIF bioactivity.
MeSH Terms
Amino Acid Sequence
Animals
Cysteine/metabolism
Glycosylation
Humans
Hybridomas
Immunoglobulin E/immunology
Lymphokines/chemistry,genetics,metabolism
Mice
Mice, Inbred BALB C
Mice, Transgenic
Models, Molecular
Molecular Sequence Data
Prostatic Secretory Proteins
Protein Processing, Post-Translational
Protein Structure, Secondary
Receptors, Antigen, T-Cell, alpha-beta/genetics
Recombinant Proteins/chemistry,metabolism
Spleen/immunology
T-Lymphocytes/immunology
T-Lymphocytes, Regulatory/immunology
Chemicals
Lymphokines
Prostatic Secretory Proteins
Receptors, Antigen, T-Cell, alpha-beta
Recombinant Proteins
beta-microseminoprotein
immunoglobulin-binding factors
Immunoglobulin E
Cysteine
Authors & Affiliations
8 authors, click to expand affiliations / ORCID
Watarai H
Pharmaceutical Research Laboratory, Kirin Brewery Company, Ltd., 3. Miyahara-cho, Takasaki 370-1295, Gunma, Japan.
Nozawa R
Tokunaga A
Yuyama N
Tomas M
Hinohara A
Ishizaka K
Ishii Y
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