in Title
  in Authors
  in Institutions
  in Abstract
  in Keywords

  - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  - Instructions to Authors
   "sample paper download"

  - Preparation of Tables
    and Illustrations


  - Chemical and
    Mathematical Usage,
    Addreviations, and
    Symbols


  - Editorial Board

  - Manuscript submission
   form


 



Article Info.
2006.09.30; 39(5) pp. 636~641
Title

Interaction of Native and Apo-carbonic Anhydrase with Hydrophobic Adsorbents: A Comparative Structure-function Study  

Authors

Zahra Salemi1, Saman Hosseinkhani2, Bijan Ranjbar2 and Mohsen Nemat-Gorgani1,3,*  

Institutions

1Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran 1Department of Biochemistry, Faculty of Basic Science, Tarbiat Modarres University, Tehran, Iran 1Stanford Genome Technology Center, Stanford University, Palo Alto, CA, USA  

Abstract

Our previous studies indicated that native carbonic anhydrase does not interact with hydrophobic adsorbents and that it acquires this ability upon denaturation. In the present study, an apo form of the enzyme was prepared by removal of zinc and a comparative study was performed on some characteristic features of the apo and native forms by far- and near-UV circular dichroism (CD), intrinsic fluorescent spectroscopy, 1-anilino naphthalene-8-sulfonate (ANS) binding, fluorescence quenching by acrylamide, and Tm measurement. Results indicate that protein flexibility is enhanced and the hydrophobic sites become more exposed upon conversion to the apo form. Accordingly, the apo structure showed a greater affinity for interaction with hydrophobic adsorbents as compared with the native structure. As observed for the native enzyme, heat denaturation of the apo form promoted interaction with alkyl residues present on the adsorbents and, by cooling followed by addition of zinc, catalytically-active immobilized preparations were obtained.
 

Keywords

Adsorptive immobilization, Apo-carbonic anhydrase, Hydrophobic matrices, Molten globule