1itf

INTERFERON ALPHA-2A, NMR, 24 STRUCTURESINTERFERON ALPHA-2A, NMR, 24 STRUCTURES

Structural highlights 1itf is a 1 chain structure with sequence from Homo sapiens. The August 2010 RCSB PDB Molecule of the Month feature on Interferons by David Goodsell is 10.2210/rcsb_pdb/mom_2010_8. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, 24 models Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function IFNA2_HUMAN Produced by macrophages, IFN-alpha have antiviral activities. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The solution structure of recombinant human interferon alpha-2a (Roferon-A) has been determined by multidimensional heteronuclear NMR spectroscopy. The calculations using simulated annealing produced a family of 24 convergent structures which satisfy the experimental restraints comprising 1541 NOE-derived inter-proton distances, 187 dihedral restraints, 66 pairs of hydrogen bond restraints, and six upper and lower limits for two disulfide bridges. The fractional labeling of methyl groups allowed their direct and unambiguous stereospecific assignment which proved to be essential for obtaining a high resolution of the structures. A best fit superposition of residues 10 to 47, 50 to 101 and 111 to 157 gives an rms deviation of 0.62 A for the backbone heavy atoms and 1.39 A for all heavy atoms of these segments. The dominant feature of the structure is a cluster of five alpha-helices, four of which are arranged to form a left-handed helix bundle with an up-up-down-down topology and two over-hand connections. The interpretation of heteronuclear 15N- inverted question mark1H inverted question mark NOE data shows the co-existence of flexible regions within an otherwise rigid framework of the protein. Four stretches of pronounced flexibility can be located: Cys1-Ser8, Gly44-Ala50, Ile100-Lys112, and Ser160-Glu165. Among the structurally related four-helical bundle cytokines, the structure of IFN alpha-2a is most similar to that of human interferon alpha-2b and murine interferon-beta. From this structural information and mutagenesis data, areas on the surface of the protein are identified which seem to be important in receptor interactions. The three-dimensional high resolution structure of human interferon alpha-2a determined by heteronuclear NMR spectroscopy in solution.,Klaus W, Gsell B, Labhardt AM, Wipf B, Senn H J Mol Biol. 1997 Dec 12;274(4):661-75. PMID:9417943 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Interferon 3D structures

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