Abstract
Hexokinase (HK) is one of the key enzymes in the glycolytic pathway that catalyzes the phosphorylation of glucose. In the present study, we cloned the HK gene from the coccidian Eimeria tenella (EtHK), expressed EtHK as a His-tagged fusion protein, and characterized its primary biochemical features. Mutagenesis confirmed that residues S159, N216, and D217 are essential or important to the EtHK catalytic activity. EtHK exhibited high affinity for d-glucose (Km = 0.67 to 0.79 mM), but was also able to utilize 2-deoxy-d-glucose (Km = 5.66 mM), d-fructose (Km = 13.76 mM), and d-mannose (Km = 25.41 mM). We also observed that quercetin and mangiferin could inhibit the EtHK enzyme activity (IC50 values = 6.52 and 85.82 μM, respectively). Among the two inhibitors, mangiferin also inhibited the growth of E. tenella in vitro (MIC50 = 0.12 μM). These observations suggest that EtHK may be explored as potential drug target, and mangiferin and its analogs may be explored for developing anti-coccidial therapeutics.




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Acknowledgments
This work was supported in part by NSFC grants (nos. 31302087 and 31402186), NSF grant of Guangdong province (no. 2015A030313561), the Science and Technology Planning Project of Guangdong province (nos. 2014A020208057, 2014B090901035, 2015B050501007, 2014B070706011, and 2012A020100001). E. tenella hexokinase (EtHK)cDNA sequence data was obtained from the ToxoDB database under the EuPathDB (http://www.EupathDB.org).
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Mingfei Sun and Shenquan Liao contributed equally to this work.
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Sun, M., Liao, S., Zhang, L. et al. Molecular and biochemical characterization of Eimeria tenella hexokinase. Parasitol Res 115, 3425–3433 (2016). https://doi.org/10.1007/s00436-016-5104-4
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DOI: https://doi.org/10.1007/s00436-016-5104-4


