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Purification and characterization of CeqI restriction endonuclease

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Item Type:Article
Title:Purification and characterization of CeqI restriction endonuclease
Creators Name:Izsvak, Z., Jobbagy, Z. and Duda, E.
Abstract:CeqI, a type II restriction endonuclease, an isoschizomer of EcoRV was purified to apparent homogeneity by a combination of salt precipitation, ion exchange, dye affinity and hydrophobic interaction chromatographies. The crude enzyme was present in the form of large aggregates that could be pelleted by high speed centrifugation. The enzyme was not associated with cellular membranes, though non-ionic detergents lowered the apparent size of the aggregates. The purified enzyme also showed a tendency to form large molecular mass (66-600 kDa) complexes under physiological conditions, in the absence of cleavable DNA. The enzyme formed smaller complexes in the presence of DNA and non-ionic detergents and dissociated into subunits (and undergoes reversible loss of activity) in the presence of high concentrations of salts. According to SDS gel electrophoresis and sedimentation analysis the molecular mass of the monomer 32 +/- 2 kDa. The enzyme had a rather broad PH optimum, extending into the alkaline range and lost specificity and activity in buffers below pH 6.
Source:Zeitschrift fuer Naturforschung C, A Journal of Biosciences
ISSN:0341-0382
Volume:47
Page Range:830-834
Date:1 November 1992
Additional Information:This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Official Publication:https://doi.org/10.1515/znc-1992-11-1208
PubMed:View item in PubMed

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