ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (11): 2318-2324.doi: 10.11843/j.issn.0366-6964.2016.11.021

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Prokaryotic Expression, Activity Assay and Homology Modeling of the 3-hydroxy-3-methylglutaryl Coenzyme A Reductase from Streptococcus suis

LIU Can-ying1, XU Zhuo-fei2, FU Qiang1   

  1. (1. Department of Life Sicence and Engineering, Foshan University, Foshan 528000, China; 2. College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China)
  • Received:2016-06-22 Online:2016-11-23 Published:2016-11-23

Abstract:

The aim of this study was to take the Streptococcus suis (S. suis) 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMGR) as a drug target, and provide theoretical and experimental basis for the development of novel antibiotics for the prevention and treatment of S. suis infection. In this experiment, S. suis HMGR was prokaryotically expressed and purified by Ni-NTA agrose. Its enzyme activity was determined by spectrophotometric method. In addition, a multiple sequence alignment of HMGR was performed by CLUSTALW to identify conserved domains. Homology modeling of the three-dimensional (3D) structure of S. suis HMGR was performed by SWISS-MODEL. The quality of the model was evaluated by PROCHECK. The result of enzyme activity analyses showed that optimal reaction conditions of S. suis HMGR was pH 5.0 and 37 ℃, the Vmax and Km value was 846 U•mg-1 and 0.213 mmol•L-1 respectively. The analysis of SWISS-MODEL showed that crystal structure of Streptococcus pneumonia HMGR was the appropriate template for homology modeling of S. suis HMGR. The theoretic model of 3D structure of S. suis HMGR was proven to be reliable through quality assessment. The S. suis HMGR model will contribute to virtual screening of novel antibacterial agents against S. suis infection. Enzyme activity assay provides a feasible method for validation of effective inhibitors against S. suis HMGR in biochemical experiment.

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