Crystallization and preliminary X-ray studies of a recombinant calcium-binding protein from Entamoeba histolytica

Gopal, B. ; Suma, R. ; Murthy, M. R. N. ; Bhattacharya, A. ; Bhattacharya, S. (1998) Crystallization and preliminary X-ray studies of a recombinant calcium-binding protein from Entamoeba histolytica Acta Crystallographica Section D, 54 (6-2). pp. 1442-1445. ISSN 0907-4449

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Official URL: http://onlinelibrary.wiley.com/doi/10.1107/S090744...

Related URL: http://dx.doi.org/10.1107/S0907444998001759

Abstract

A calcium-binding protein (CaBP) of Entamoeba histolytica was purified from an E. coli recombinant clone carrying the CaBP gene in a pET-3c expression vector using anion-exchange and size-exclusion chromatography. Examination of the amino-acid sequence of the recombinant protein suggested that it has four independent EF-hand motifs. The protein dissolved in cacodylate buffer was crystallized using the hanging-drop method with 2-methylpentane-2,4-diol (MPD) as the precipitant. X-ray diffraction data have been collected on these crystals using a MAR Research imaging-plate detector system attached to a Rigaku RU200 rotating-anode X-ray generator. The crystals belong to the hexagonal space group P6122 with unit-cell dimensions of a=b=96.21, c=65.48Å. Preliminary molecular-replacement computations suggest that the structure of this protein is likely to be similar to that of calmodulin (CAM).

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Deposited On:28 Apr 2011 05:53
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