title: Serum IL-2 inhibitor in mice. II. Molecular characteristics.
abstract: The molecular characteristics of a serum IL-2 inhibitor were determined by fractionating active sera from normal and malaria-infected mice, and assaying inhibitory activity in blocking production and expression of IL-2 activity. Using isoelectric focusing and ion exchange chromatography, the activity resolved in a single peak (pI = 6.2). HPLC gel filtration resolved two peaks of activity (50,000 and 25,000 MW) which are probably related. The molecule is precipitated by 50% saturated ammonium sulphate, and is destroyed by heating above 56 degrees or by acidification below pH 4.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007376:Interleukin-2 / Q000032:analysis / Q000276:immunology*; D007525:Isoelectric Focusing; D008288:Malaria / Q000276:immunology*; D051379:Mice; D008815:Mice, Inbred Strains; D008970:Molecular Weight
chemical_list: D007376:Interleukin-2