title: Purification and characterization of an L-glutamic acid60-L-alanine30-L-tyrosine10 (GAT)-specific suppressor factor from genetic responder mice.
abstract: A hybridoma-derived, GAT-specific suppressor T cell factor (GAT-TsFR) from responder C57BL/10 mice has been purified to apparent chemical homogeneity using reversed phase HPLC techniques. 40 l of starting material yielded approximately 880 micrograms protein with a specific activity of 28.4 X 10(3) S50 U/ng protein representing a purification factor of 4.2 X 10(6). Purified GAT-TsFR is a hydrophobic protein with a minimum molecular weight of 18,000 that is capable of forming biologically active aggregates with molecular weights of 28,000, 64,000 and approximately 84,000 and has a pI of 6.4. GAT-TsFR is a glycoprotein that binds GAT and GT, but not GA, and bears determinants encoded by the I-J subregion of the H-2 complex. This GAT-TsFR derived from an H-2b responder haplotype to GAT is compared with GAT-TsF derived from the nonresponder H-2q haplotype on the basis of biochemical and some serological properties.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D000939:Epitopes; D006825:Hybridomas / Q000276:immunology; D008213:Lymphocyte Activation; D008222:Lymphokines / Q000032:analysis / Q000302:isolation & purification* / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D008970:Molecular Weight; D010455:Peptides / Q000276:immunology*; D011108:Polymers; D013491:Suppressor Factors, Immunologic; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D000596:Amino Acids; D000939:Epitopes; D008222:Lymphokines; D010455:Peptides; D011108:Polymers; D013491:Suppressor Factors, Immunologic; C020749:GAT