title: 1H, 13C and 15N resonance assignments of a highly-soluble murine interleukin-3 analogue with wild-type bioactivity.
abstract: Interleukin-3 (IL-3) is a cytokine that acts as a critical mediator of inflammation and immune responses to infections. IL-3, like interleukin-5 (IL-5) and granulocyte-macrophage colony stimulating factor (GM-CSF), exerts its effects on target cells via receptors composed of cytokine-specific alpha-subunits and a common beta-subunit (betac-subunit, shared with IL-5 and GM-CSF). In contrast to humans, mice also possess an additional beta-receptor, beta(IL-3), that can specifically bind IL-3. Except for a study carried out on an analogue of human IL-3 that contains 14 mutations, structure-related studies of IL-3 have been very limited, largely because of its poor solution behaviour. Here we report (1)H, (13)C, and (15)N chemical shift assignments of murine IL-3 comprising residues 33-156 (SWISS-PROT accession number: P01586), in which the only mutation is an alanine substitution of Cys105. The mIL-3 construct used in the present study was engineered by eliminating residues 27-32 of the N-terminus (the first 26 residues of the primary sequence of mIL-3 are cleaved in vivo during secretion), the C-terminal 10 residues (157-166), and a disulfide bond between Cys105 and Cys166 that is poorly conserved in orthologue sequences. The new construct vastly improves the solubility of murine IL-3 while maintaining its wild-type biological activity.
authors.affiliation: The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC 3052, Australia. syao@wehi.edu.au
authors.forename: Shenggen
authors.initials: S
authors.lastname: Yao
authors.forename: James M
authors.initials: JM
authors.lastname: Murphy
authors.forename: Andrew
authors.initials: A
authors.lastname: Low
authors.forename: Raymond S
authors.initials: RS
authors.lastname: Norton
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002247:Carbon Isotopes / Q000737:chemistry; D006801:Humans; D006859:Hydrogen / Q000737:chemistry; D007377:Interleukin-3 / Q000031:analogs & derivatives / Q000737:chemistry* / Q000235:genetics; D051379:Mice; D020125:Mutation, Missense; D009587:Nitrogen Isotopes / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular; D017433:Protein Structure, Secondary; D012984:Software; D012995:Solubility; D040681:Structural Homology, Protein
chemical_list: D002247:Carbon Isotopes; D007377:Interleukin-3; D009587:Nitrogen Isotopes; D006859:Hydrogen