A Highly Selective Biosensor Based on Peptide Directly Derived from the HarmOBP7 Aldehyde Binding Site.

Area of Science:

• Biomaterials Science
• Analytical Chemistry
• Biochemistry

Background:

• Odorant Binding Proteins (OBPs) play a crucial role in olfaction by binding volatile molecules.
• Developing synthetic peptide mimics of OBPs can lead to novel biosensor applications.
• Understanding the relationship between peptide chain length and ligand binding affinity is key for sensor design.

Purpose of the Study:

• To determine the optimal peptide chain length for effective octanal binding.
• To develop a biomimetic piezoelectric biosensor for selective octanal detection using Odorant Binding Protein-derived Peptides (OBPPs).
• To investigate the influence of peptide chain length on ligand binding affinity.

Main Methods:

• Computational studies (molecular modeling, ligand docking) were used to select four OBPPs.
• OBPPs were immobilized on piezoelectric transducers to create biosensors.
• Experimental results were correlated with in silico findings to validate peptide performance.

Main Results:

• The longest peptide, OBPP4 (KLLFDSLTDLKKKMSEC-NH2), exhibited the highest affinity for octanal.
• OBPP4-based biosensors demonstrated selective binding of octanal in the gas phase.
• The sensors showed high selectivity for octanal over acetaldehyde and benzaldehyde.

Conclusions:

• Peptide chain length significantly influences ligand binding affinity and interaction effectiveness.
• Synthetic OBPPs can successfully mimic OBP binding sites for biosensor development.
• The OBPP4 peptide offers a promising foundation for creating advanced biomimetic odor biosensors.