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Serpins from wheat grain

I Rosenkrands1, J Hejgaard, S K Rasmussen

  • 1Department of Biochemistry and Nutrition, Technical University of Denmark, Lyngby.

FEBS Letters
|April 18, 1994
PubMed
Summary

Researchers identified wheat serpin genes and proteins homologous to barley protein Z. These wheat serpins exhibit chymotrypsin inhibitory activity and form stable complexes, indicating a role in seed defense mechanisms.

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Area of Science:

  • Plant biochemistry
  • Molecular biology
  • Proteomics

Background:

  • Serpins are crucial regulatory proteins found across species.
  • Barley protein Z serves as a model for studying plant serpins.
  • Understanding wheat serpins is important for agricultural applications.

Purpose of the Study:

  • To identify and characterize serpin genes and proteins in wheat.
  • To investigate the functional properties of wheat serpins, including enzyme inhibition.
  • To confirm the homology of wheat serpins with known barley and mammalian counterparts.

Main Methods:

  • Southern blot hybridization using barley protein Z probes.
  • Immunoblot analysis with a monoclonal antibody against barley protein Z.
  • Protein extraction, chromatography (thiophilic adsorption, anion-exchange), and affinity chromatography.
  • N-terminal amino acid sequencing and mass spectrometry.
  • Analysis of SDS-stable complex formation with alpha-chymotrypsin.

Main Results:

  • Wheat serpin genes were identified and related proteins (approx. 40 kDa) were detected in wheat grain.
  • Wheat serpins were purified and demonstrated to possess chymotrypsin inhibitory activity.
  • Sequence analysis confirmed homology to barley protein Z and mammalian serpins.
  • A stable complex formed between wheat serpin and alpha-chymotrypsin.

Conclusions:

  • Wheat possesses serpin genes and proteins homologous to barley protein Z.
  • These wheat serpins are functional inhibitors of alpha-chymotrypsin.
  • The findings contribute to understanding plant defense mechanisms and protein families.

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