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Thiamin-binding protein from sunflower seeds

K Watanabe1, K Chikushi, T Adachi

  • 1Department of Food and Nutrition, Faculty of Agriculture, Kinki University, Nara, Japan.

Journal of Nutritional Science and Vitaminology
|January 27, 1999
PubMed
Summary

Researchers isolated a thiamin-binding protein from sunflower seeds, finding it shares properties with helianthinin. This protein

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Area of Science:

  • Biochemistry
  • Plant Science
  • Food Science

Background:

  • Thiamin (vitamin B1) is essential for human health.
  • Plant-based sources of thiamin-binding proteins are of interest for nutritional and biochemical studies.
  • Sunflower seeds are a potential source of novel proteins with unique binding properties.

Purpose of the Study:

  • To isolate and characterize a thiamin-binding protein from sunflower seeds.
  • To compare the properties of this protein with known thiamin-binding proteins from other plant sources.

Main Methods:

  • Protein isolation using biochemical techniques.
  • Molecular mass estimation via gel filtration.
  • Amino acid composition analysis.
  • Thiamin-binding activity assays at varying pH and in the presence of thiamin analogs.

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Main Results:

  • A 230 kDa thiamin-binding protein was isolated, likely composed of six subunits.
  • The protein exhibited high glutamine/glutamic acid and asparagine/aspartic acid content, with low tryptophan and valine.
  • Optimal thiamin-binding activity occurred at pH 8.0-9.0.
  • Binding was not inhibited by common thiamin derivatives.
  • Properties were similar to helianthinin and buckwheat thiamin-binding proteins, but distinct from rice and sesame proteins.

Conclusions:

  • Sunflower seeds contain a unique thiamin-binding protein with characteristics similar to helianthinin.
  • The protein's properties suggest specific structural and functional attributes relevant to thiamin interaction.
  • Comparative analysis highlights variations in thiamin-binding proteins across different plant species.