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Related Experiment Videos

Deoxyhypusine synthase from rat testis: purification and characterization

E C Wolff1, Y B Lee, S I Chung

  • 1Enzyme Chemistry Section, National Institute of Dental Research, NIH, Bethesda, Maryland 20892-4330, USA.

The Journal of Biological Chemistry
|April 14, 1995
PubMed
Summary

Deoxyhypusine synthase, crucial for creating the unique amino acid hypusine in eukaryotic translation initiation factor 5A (eIF-5A), has been purified. This NAD-dependent enzyme

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Area of Science:

  • Biochemistry
  • Enzymology
  • Post-translational modification

Background:

  • Hypusine is a unique amino acid found in eukaryotic translation initiation factor 5A (eIF-5A).
  • Deoxyhypusine synthase initiates the post-translational modification pathway leading to hypusine formation.

Purpose of the Study:

  • To purify and characterize deoxyhypusine synthase.
  • To investigate the enzyme's properties and specificity.

Main Methods:

  • Purification involved ammonium sulfate fractionation, ion-exchange chromatography, and chromatofocusing.
  • Enzyme properties were assessed using isoelectric focusing, SDS-PAGE, and mass spectrometry.
  • Antibodies were generated to confirm enzyme identity and activity.

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Main Results:

  • Deoxyhypusine synthase was purified from rat testis.
  • The enzyme has a pI of 4.7 and a monomer molecular mass of approximately 40.8 kDa (42 kDa by SDS-PAGE).
  • The active form appears to be a tetramer; antibodies precipitated enzyme activity, and it showed strict NAD specificity.

Conclusions:

  • The study successfully purified and characterized deoxyhypusine synthase.
  • The enzyme is essential for hypusine biosynthesis and exhibits catalytic activity on spermidine cleavage in the absence of its substrate.