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Postsecretory modifications of streptavidin.

E A Bayer1, H Ben-Hur, Y Hiller

  • 1Department of Biophysics, Weizmann Institute of Science, Rehovot, Israel.

The Biochemical Journal
|April 15, 1989
PubMed
Summary

Streptavidin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Streptavidin is an extracellular biotin-binding protein produced by Streptomyces avidinii.
  • Its electrophoretic mobility is variable, influenced by bacterial growth conditions and protein purification methods.

Purpose of the Study:

  • To investigate the structural heterogeneity of streptavidin.
  • To understand the molecular events causing this heterogeneity and their impact on biotin-binding capacity.

Main Methods:

  • Analysis of streptavidin's electrophoretic mobility.
  • Investigation of postsecretory molecular modifications, including proteolytic digestion and aggregation.

Main Results:

  • Streptavidin exhibits structural heterogeneity due to proteolytic subunit degradation (18,000 to 14,000 Mr) and tetramer aggregation.
  • The degree of degradation and aggregation impacts streptavidin's interaction with biotin-conjugated proteins.

Conclusions:

  • Postsecretory molecular events significantly alter streptavidin structure.
  • Variations in streptavidin structure affect its functional performance in assays involving biotin-conjugated proteins.

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