• Preliminary crystallographic analysis of the N-terminal PDZ-like domain of periaxin, an abundant peripheral nerve protein linked to human neuropathies.

      Han, Huijong; Kursula, Petri (2013-07)
      Periaxin (PRX) is an abundant protein in peripheral nerves and contains a predicted PDZ-like domain at its N-terminus. The large isoform, L-PRX, is required for the maintenance of myelin in the peripheral nervous system and its defects cause neurological disease. Here, the human periaxin PDZ-like domain was crystallized and X-ray diffraction data were collected to 2.85 Å resolution using synchrotron radiation. The crystal belonged to the primitive hexagonal space group P3121 or P3221, with unit-cell parameters a = b = 80.6, c = 81.0 Å, γ = 120° and either two or three molecules in the asymmetric unit. The structure of PRX will shed light on its poorly characterized function in the nervous system.
    • Production and crystallization of a panel of structure-based mutants of the human myelin peripheral membrane protein P2.

      Lehtimäki, Mari; Laulumaa, Saara; Ruskamo, Salla; Kursula, Petri (2012-11-01)
      The myelin sheath is a multilayered membrane that surrounds and insulates axons in the nervous system. One of the proteins specific to the peripheral nerve myelin is P2, a protein that is able to stack lipid bilayers. With the goal of obtaining detailed information on the structure-function relationship of P2, 14 structure-based mutated variants of human P2 were generated and produced. The mutants were designed to potentially affect the binding of lipid bilayers by P2. All mutated variants were also crystallized and preliminary crystallographic data are presented. The structural data from the mutants will be combined with diverse functional assays in order to elucidate the fine details of P2 function at the molecular level.
    • Purification, crystallization and preliminary X-ray crystallographic analysis of MIL, a glycosylated jacalin-related lectin from mulberry (Morus indica) latex.

      Patel, Ashok K; Singh, Vijay K; Bergmann, Ulrich; Jagannadham, Medicherla V; Kursula, Petri (2011-05-01)
      A quantitatively major protein has been purified from the latex of Morus indica. The purified previously uncharacterized protein, M. indica lectin (MIL), was further shown to be a glycosylated tetramer and belongs to the family of jacalin-related lectins. Crystallization of MIL was also accomplished and the tetragonal crystals diffracted synchrotron X-rays to a resolution of 2.8 Å.