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Related Experiment Videos

Domain structure, stability and interactions in streptokinase

L V Medved1, D A Solovjov, K C Ingham

  • 1J. Holland Laboratory, American Red Cross, Rockville MD 20855, USA.

European Journal of Biochemistry
|July 15, 1996
PubMed
Summary

Differential scanning calorimetry revealed streptokinase has four independently folded domains. Proteolytic fragments suggest a stepwise domain removal, with C-terminal domains showing strong interactions and N-terminal domains greater independence.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Folding

Background:

  • Streptokinase is a protein with a complex structure.
  • Understanding its structural organization is crucial for its function.

Purpose of the Study:

  • To elucidate the structural organization of streptokinase.
  • To investigate the domain structure and interactions within streptokinase.

Main Methods:

  • Differential scanning calorimetry (DSC) was used to study streptokinase denaturation.
  • Analysis of proteolytic fragments (37-kDa and 17-kDa) of streptokinase.

Main Results:

  • DSC revealed four distinct two-state transitions, indicating four independently folded domains.
  • pH changes affected the stability of different domains.

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  • Analysis of fragments suggested stepwise domain removal and identified NH2-terminal and COOH-terminal domains.
  • Strong interactions were observed between the two COOH-terminal domains.

    • Conclusions:

    • Streptokinase possesses a four-domain structure with distinct stability profiles.
    • The COOH-terminal domains exhibit significant inter-domain interactions.
    • The NH2-terminal domains appear more independent, with one showing altered stability upon cleavage.