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Human interleukin 4 (IL-4) has been studied by 2D and 3D NMR techniques using uniformly 15N-labeled recombinant protein. Assignment of resonances for all but 3 of the 130 residues of the recombinant protein has been achieved, enabling the secondary structure of the protein to be defined. This consists of four major alpha-helical regions and one short section of double-stranded antiparallel beta-sheet. Analysis of distance and angle restraints derived from NMR experiments has enabled the overall molecular topology to be determined. This is related to that found for other four-helix proteins but has several distinctive features including cross-linking of helices by means of three disulfide bonds and a short section of beta-sheet. The structural analysis gives support to the hypothesis that many helical cytokines have a common fold and provides a basis for understanding the biological function of IL-4.

Type

Journal article

Journal

Biochemistry

Publication Date

19/11/1991

Volume

30

Pages

11029 - 11035

Keywords

Amino Acid Sequence, Cross-Linking Reagents, Humans, Interleukin-4, Magnetic Resonance Spectroscopy, Molecular Sequence Data, Protein Conformation, Recombinant Proteins, Solutions