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  • Title: Crystallization and preliminary crystallographic data of SnoaL, a polyketide cyclase in nogalamycin biosynthesis.
    Author: Sultana A, Kallio P, Jansson A, Niemi J, Mäntsälä P, Schneider G.
    Journal: Acta Crystallogr D Biol Crystallogr; 2004 Jun; 60(Pt 6):1118-20. PubMed ID: 15159574.
    Abstract:
    Nogalonic acid methyl ester cyclase (SnoaL) catalyzes the last ring-closure step in the biosynthesis of the polyketide antibiotic nogalamycin. Crystals of a complex of SnoaL with the substrate nogalonic acid methyl ester have been obtained using PEG 4000 as precipitant. The crystals are orthorhombic, space group I222, with unit-cell parameters a = 69.1, b = 72.0, c = 65.4 angstroms. They diffract to 1.35 angstroms resolution using synchrotron radiation. A Matthews coefficient of 2.0 angstroms3 Da(-1) suggests one subunit in the asymmetric unit. Diffraction data for an isomorphous uranium derivative were collected and a difference Patterson map showed strong peaks which allowed determination of the position of the uranium ions.
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