Science in China Series C: Life Sciences

, Volume 41, Issue 3, pp 245–250 | Cite as

Activation and conformational changes of adenylate kinase in urea solution

  • Hongjie Zhang
  • Xianming Pan
  • Junmei Zhou
  • Kihara Hiroshi


The activation and inactivation of adenylate kinase during deneturation in urea are compared with changes in UV absorbance at 287 nm. CD spectrum change at 222 nm, fluorescence intensity of ANS biding and small angle of X-ray scattering. At 1 mol/L, of urea the enzyme is activated 1.5-fold companied with a subtie decressing of its second structure, whereas its tertiary structure is fairly resistant to denaturation. By comparing the studies of the crystal structure and the mechanism of the catalysis of adenylste kinase, the activation is believed to result the effect that low concentration of urea increases the flexibility of the active site of the enzyme. This suggestion was confirmed by the results of the fluorescence intensity changes of ANS binding to adenylate kinase versus the concentration of urea.

Key words

adenylate kinase urea denaturation activation flexibillity of aetive site 


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Copyright information

© Science in China Press 1998

Authors and Affiliations

  • Hongjie Zhang
    • 1
  • Xianming Pan
    • 1
  • Junmei Zhou
    • 1
  • Kihara Hiroshi
    • 2
  1. 1.State Key Laboratory of Biomacromolecule, Insritute of BiophysicsChinese Academy of SciencesBeijingChina
  2. 2.Physics LaboratoryKansai Medical UniversityOaskaJapan

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