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[hHO-1 structure prediction and its mutant construct, expression, purification and activity analysis].

Zhen Wei Xia1, Wen Jun Cui, Wen Pu Zhou

  • 1Department of Pediatrics, Rui Jin Hospital, Shanghai Second Medical University, Shanghai. xzw63@hotmail.com

Shi Yan Sheng Wu Xue Bao
|January 8, 2005
PubMed
Summary

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The mutation of His25 to Ala25 in human heme oxygenase-1 (hHO-1) significantly reduced enzyme activity by over 91%. This highlights His25

Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Human heme oxygenase-1 (hHO-1) is a critical enzyme regulating heme catabolism and bilirubin levels.
  • Understanding the structure-activity relationship of hHO-1 is crucial for its biological function.

Purpose of the Study:

  • To investigate the role of Histidine 25 (His25) in the active site of human heme oxygenase-1 (hHO-1).
  • To characterize the biochemical properties of a mutant hHO-1 with Ala25 substitution.

Main Methods:

  • In silico structural simulation using Swiss-pdbviewer to predict the effect of His25 substitution.
  • Construction and expression of wild-type and mutant hHO-1 in E. coli.
  • Protein purification using ammonium sulfate precipitation and ion-exchange chromatography.

Related Experiment Videos

  • Enzyme activity assays to compare wild-type and mutant hHO-1.

    • Main Results:

    • The His25 to Ala25 mutation altered the active pocket structure but retained heme binding.
    • Purification strategies achieved significant concentration increases of hHO-1.
    • The mutant hHO-1 (deltahHO-1) exhibited a 91.21% reduction in activity compared to wild-type hHO-1 (whHO-1).

    Conclusions:

    • Histidine 25 is essential for the catalytic mechanism and activity of human heme oxygenase-1.
    • This study provides insights into regulating hHO-1 activity for potential therapeutic applications.