title: Mutagenesis of murine granulocyte/macrophage-colony-stimulating factor reveals critical residues near the N terminus.
abstract: A number of cDNAs encoding mutant forms of the murine haemopoietic growth factor, granulocyte/macrophage-colony-stimulating factor (GM-CSF), have been derived by in vitro mutagenesis and expressed in simian COS cells. Determination of the biological activity of the mutant factors revealed that residues within the regions 11-15, 24-37, 47-49 and 81-89 are required for generating a functional GM-CSF molecule. In particular, truncation of either of two strongly predicted alpha helices near the N terminus of the molecule severely depresses the activity of the factor.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D002872:Chromosome Deletion; D003001:Cloning, Molecular; D005796:Genes; D007377:Interleukin-3 / Q000235:genetics*; D051379:Mice; D008969:Molecular Sequence Data; D009154:Mutation; D014162:Transfection
chemical_list: D007377:Interleukin-3