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Related Experiment Videos

Two crystal structures of the leupeptin-trypsin complex

I V Kurinov1, R W Harrison

  • 1Department of Pharmacology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA.

Protein Science : a Publication of the Protein Society
|April 1, 1996
PubMed
Summary

The three-dimensional structures of trypsin and the inhibitor leupeptin were determined, revealing a stable tetrahedral complex. This complex formation involves specific hydrogen bonds and a covalent bond at the active site, crucial for understanding enzyme inhibition.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Trypsin is a key digestive enzyme.
  • Leupeptin is a reversible inhibitor of serine proteases like trypsin.
  • Understanding enzyme-inhibitor interactions is vital for drug development.

Purpose of the Study:

  • To determine the three-dimensional structures of trypsin in complex with leupeptin.
  • To elucidate the molecular interactions responsible for leupeptin's inhibitory activity.
  • To characterize the reaction mechanism between trypsin and leupeptin.

Main Methods:

  • X-ray crystallography was used to determine the structures.
  • Two different crystal forms (trigonal and orthorhombic) were analyzed.
  • High-resolution data (1.7 A and 1.8 A) were collected and refined.

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Main Results:

  • The overall protein structure of trypsin remained highly similar in both crystal forms (RMSD of 0.27 A).
  • Leupeptin formed four direct hydrogen bonds and one water-mediated hydrogen bond with trypsin.
  • A covalent bond was observed between leupeptin's aldehyde carbonyl and Ser-195, forming a stable tetrahedral complex.

Conclusions:

  • The study provides detailed structural insights into the trypsin-leupeptin interaction.
  • The formation of a stable tetrahedral complex is a key feature of this reversible inhibition.
  • These findings contribute to the understanding of serine protease inhibition mechanisms.