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BPTI backbone variants and implications for inhibitory activity

C Groeger1, H R Wenzel, H Tschesche

  • 1Department of Biochemistry, Faculty of Chemistry, Bielefeld University, Germany.

International Journal of Peptide and Protein Research
|August 1, 1994
PubMed
Summary
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Structural variants of a key enzyme inhibitor were created using semisynthesis. Replacing an amide bond with a ketomethylene or ester function reduced inhibitory activity against trypsin due to lost hydrogen bonds.

Area of Science:

  • Biochemistry
  • Enzyme Inhibition
  • Protein Engineering

Background:

  • Bovine pancreatic trypsin inhibitor (BPTI) is a well-characterized serine protease inhibitor.
  • Understanding the molecular interactions critical for BPTI's inhibitory function is essential for designing novel inhibitors.

Purpose of the Study:

  • To synthesize structural variants of BPTI by modifying the P1-P2 amide bond.
  • To investigate the impact of replacing the P1-P2 amide bond with ketomethylene or ester functions on inhibitory activity and enzyme-inhibitor complex stability.

Main Methods:

  • Enzymatic-chemical semisynthesis was employed to create BPTI structural variants.
  • The P1-P2 amide bond was replaced with a ketomethylene function or an ester bond.
  • Inhibitory activity and dissociation constants of the modified BPTI derivatives with trypsin were evaluated.

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Main Results:

  • Two backbone-mutated BPTI derivatives were successfully synthesized, retaining inhibitory activity.
  • These derivatives exhibited increased dissociation constants for their respective trypsin complexes.
  • The observed decrease in binding affinity was attributed to the absence of a key hydrogen bond interaction.

Conclusions:

  • The P1-P2 amide bond in BPTI plays a crucial role in stabilizing the enzyme-inhibitor complex through hydrogen bonding.
  • Replacing this amide bond with non-amide functionalities, such as ketomethylene or ester, significantly weakens the binding affinity to trypsin.
  • These findings provide insights into the structure-activity relationships of BPTI and inform the design of protease inhibitors.