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Truncated reactive center loop decrease the inhibitory activity of Antheraea pernyi serine protease inhibitor 6.

Guobao Wang1, Shuang Na2, Li Qin2

  • 1College of Biological and Agricultural Engineering, Weifang University, Weifang, China.

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Summary
This summary is machine-generated.

Altering the reactive center loop (RCL) length in Apserpin-6 impacts its ability to inhibit prophenoloxidase (proPO). Deleting residues reduces inhibition efficiency, while insertions have no effect.

Keywords:
Antheraea pernyiproPO activityreactive center loopserine protease inhibitor 6variant

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Apserpin-6 is a recombinant protein with inhibitory properties.
  • The reactive center loop (RCL) is crucial for protease inhibition.
  • Understanding RCL function is key to elucidating inhibition mechanisms.

Purpose of the Study:

  • To investigate the impact of systematic changes in RCL length on Apserpin-6 inhibitory activity.
  • To determine how N-terminal modifications to the RCL affect prophenoloxidase (proPO) inhibition.

Main Methods:

  • Site-directed mutagenesis was employed to truncate or extend the RCL of Apserpin-6.
  • Recombinant Apserpin-6 variants were created with specific residue deletions or insertions in the RCL.
  • The effect of these variants on prophenoloxidase (proPO) activity was assessed.

Main Results:

  • Insertion of one or two residues into the RCL did not alter proPO activity.
  • Deletion of one or two residues in the RCL significantly reduced Apserpin-6's inhibition efficiency.
  • The study identified a correlation between RCL length and inhibitory efficacy.

Conclusions:

  • The length of the reactive center loop (RCL) is critical for the inhibitory function of Apserpin-6.
  • Modifications to RCL length directly influence the efficiency of prophenoloxidase (proPO) inhibition.
  • These findings enhance the understanding of RCL-mediated inhibition mechanisms.