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  • Title: Crystallization and preliminary X-ray analyses of catabolite control protein A, free and in complex with its DNA-binding site.
    Author: Tebbe J, Orth P, Küster-Schöck EK, Hillen W, Saenger W, Hinrichs W.
    Journal: Acta Crystallogr D Biol Crystallogr; 2000 Jan; 56(Pt 1):67-9. PubMed ID: 10666630.
    Abstract:
    The catabolite control protein (CcpA) from Bacillus megaterium is a member of the bacterial repressor protein family GalR/LacI. CcpA with an N-terminal His-tag was used for crystallization. Crystals of free CcpA and of CcpA in complex with the putative operator sequence (catabolite responsive elements, CRE) were obtained by vapour-diffusion techniques at 291 K using the hanging-drop method. CcpA crystals grown in the presence of polyethylene glycol 8000 belong to the hexagonal space group P6(1)22 or P6(5)22, with unit-cell parameters a = 74.4, c = 238.8 A. These crystals diffract X-rays to 2.55 A resolution and contain one monomer of the homodimeric protein per asymmetric unit. Crystals of the CcpA-CRE complex were obtained with ammonium sulfate as precipitant and belong to the tetragonal space group I4(1)22, with unit-cell parameters a = 125, c = 400 A and one complex per asymmetric unit. Although these co-crystals grew to a sufficient size, X-ray diffraction was limited to 8 A resolution.
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