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Related Experiment Videos

Creation of a zymogen.

Parit Plainkum1, Stephen M Fuchs, Suthep Wiyakrutta

  • 1Department of Biochemistry, University of Wisconsin, Madison 53706-1544, USA.

Nature Structural Biology
|December 24, 2002
PubMed
Summary

Scientists created an inactive ribonuclease zymogen by circular permutation. Upon addition of plasmepsin II, the ribonuclease gained significant activity, demonstrating a novel strategy for enzyme control and drug development.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Drug Discovery

Background:

  • Cells synthesize proteases as inactive zymogens to regulate their activity.
  • This zymogen strategy is explored here for enzymes beyond proteases, specifically ribonuclease A.

Purpose of the Study:

  • To investigate the creation of a ribonuclease A zymogen using circular permutation.
  • To assess the controlled activation and stability of this engineered ribonuclease zymogen.

Main Methods:

  • Circular permutation was used to link the N and C termini of ribonuclease A.
  • The active site was obstructed by incorporating a sequence recognized by plasmepsin II.
  • Catalytic activity and conformational stability were measured in the presence and absence of plasmepsin II.

Main Results:

  • Engineered ribonuclease A was successfully generated as an inactive zymogen.
  • In the presence of plasmepsin II, ribonuclease activity increased by approximately 1000-fold.
  • The ribonuclease zymogen maintained high conformational stability after activation.

Conclusions:

  • Zymogen creation is a versatile strategy for controlling enzymatic activity.
  • This approach offers potential for developing novel chemotherapeutic agents targeting specific proteases.

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