Chemistry, Department of: Faculty Series
Mark A. Griep Publications
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Document Type
Article
Date of this Version
October 2005
Abstract
The cytolethal distending toxin B (CdtB) of the mouse pathogen Helicobacter hepaticus has cation binding and DNA catalysis residues in common with members of the mammalian deoxyribonuclease I (DNase I) family. The purpose of the present study was to characterize CdtB nuclease. To establish optimal digestion conditions and to evaluate co-factor requirements, a novel and sensitive fl uorometric assay that quantitatively determines double stranded DNA digestion was developed. Although the Ca2+- and Mg2+-dependence and neutral properties of CdtB were similar to DNase I, hydrolysis of DNA by CdtB was approximately 100-fold less active than DNase I and was considerably more resistant to inhibition by ZnCl2 and G-actin.
Comments
Published in FEMS Microbiology Letters 251:2 (October 2005), pp. 219–225. Copyright © 2005 Federation of European Microbiological Societies. Published by Elsevier B.V. Used by permission. http://www.sciencedirect.com/science/journal/03781097