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SdPI, the first functionally characterized Kunitz-type trypsin inhibitor from scorpion venom.

Ruiming Zhao¹, Hui Dai, Su Qiu

¹State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, People's Republic of China.

|November 17, 2011

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Researchers identified SdPI, a novel Kunitz-type peptide from scorpion venom. This potent and stable trypsin inhibitor represents a new class of venom peptides with unique structural features.

Area of Science:

Biochemistry
Toxicology
Molecular Biology

Background:

Kunitz-type peptides from various animals typically exhibit protease inhibition or potassium channel blocking.
These peptides are crucial for the survival of venomous animals.
No Kunitz-type peptides from scorpion venom have been functionally characterized previously.

Purpose of the Study:

To clone and functionally characterize a novel Kunitz-type peptide from the venom gland of the scorpion Lychas mucronatus.
To investigate the structural and functional properties of the identified peptide, named SdPI.

Main Methods:

Cloning and characterization of the SdPI gene precursor from a scorpion venom gland cDNA library.
Functional expression of the recombinant SdPI peptide.

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Analysis of its inhibitory activity, potency, and thermostability.

Mutagenesis and molecular dynamics simulation to study the active site.

Main Results:

A new Kunitz-type venom peptide precursor, SdPI, was identified, coding for a 59-residue mature peptide.
SdPI features a unique cysteine framework with three disulfide bridges, distinct from other Kunitz-type proteins.
The recombinant SdPI peptide demonstrated potent trypsin inhibitory activity (Ki = 1.6×10⁻⁷ M) and high thermostability.

Conclusions:

SdPI is a potent and stable serine protease inhibitor.
Its active site is similar to other Kunitz-type venom peptides, as confirmed by mutagenesis and simulations.
SdPI is the first functionally characterized Kunitz-type trypsin inhibitor from scorpion venom, representing a new class of venom peptides.