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Applied Biochemistry and Biotechnology

, Volume 172, Issue 8, pp 3888–3901 | Cite as

Folding Studies of Arginine Kinase from Euphausia superba Using Denaturants

  • Yue-Xiu Si
  • Nai-Yun Fang
  • Wei Wang
  • Zhi-Jiang Wang
  • Jun-Mo Yang
  • Guo-Ying Qian
  • Shang-Jun YinEmail author
  • Yong-Doo ParkEmail author
Article

Abstract

Arginine kinase (AK) is a key metabolic enzyme for maintaining energy balance in invertebrates and studies on AK from Euphausia superba might provide important insights into the metabolic enzymes in extreme climatic marine environments. A folding study of the AK from E. superba (ESAK) has not yet been reported. To gain insights into the structural and folding mechanisms of ESAK, the denaturants guanidine HCl and urea were applied in this study. We purified ESAK from the muscle of E. superba and evaluated the inhibition kinetics with structural unfolding studies under various conditions. The results revealed that ESAK was almost completely inactivated when using 1.0 M guanidine HCl and 8.25 M urea. The kinetics, characterized via time-interval measurements, showed that the inactivations by guanidine HCl and urea were first-order reactions, with the kinetic processes shifting from monophases to biphases as concentrations increased. Measurements of intrinsic and ANS (anilinonaphthalene-8-sulfonate)-binding fluorescences showed that guanidine HCl and urea induced conspicuous changes in tertiary structures and followed the regular unfolding mechanisms. Our study provides information regarding the folding of this muscle-derived metabolic enzyme and expands our knowledge and understanding of invertebrate metabolisms.

Keywords

Arginine kinase Euphausia superba Guanidine HCl Urea Unfolding 

Abbreviations

ESAK

Arginine kinase from Euphausia superba

ANS

1-Anilinonaphthalene-8-sulfonate

Notes

Acknowledgments

This study was supported by the Ningbo international cooperation project (No. 2012D10012). Dr. Guo-Ying Qian was supported by the National Natural Science Foundation of China (No. 31272638) and the Innovation Team Project of Ningbo Municipal Science and Technology Bureau (No. 2012B82016). Dr. Shang-Jun Yin was supported by a grant from the 624 project supported by the Zhejiang Leading Team of Science and Technology Innovation (Team No. 2010R50019). Dr. Jun-Mo Yang was supported by a grant of the Korea Health Technology R&D Project, Ministry of Health & Welfare, Republic of Korea (No. HI12C1299) and by a grant from the Samsung Biomedical Research Institute (GL1-B2-181-1). Dr. Yong-Doo Park was supported by a fund from the Science and Technology Planning Project of Jiaxing (No. 2012AY1041).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Yue-Xiu Si
    • 1
  • Nai-Yun Fang
    • 1
  • Wei Wang
    • 1
  • Zhi-Jiang Wang
    • 1
  • Jun-Mo Yang
    • 2
  • Guo-Ying Qian
    • 1
  • Shang-Jun Yin
    • 1
    Email author
  • Yong-Doo Park
    • 1
    • 3
    Email author
  1. 1.College of Biological and Environmental SciencesZhejiang Wanli UniversityNingboChina
  2. 2.Department of DermatologySungkyunkwan University School of Medicine, Samsung Medical CenterSeoulSouth Korea
  3. 3.Zhejiang Provincial Key Laboratory of Applied EnzymologyYangtze Delta Region Institute of Tsinghua UniversityJiaxingChina

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