Odorant-binding proteins of mammals

Area of Science:

• Biochemistry
• Molecular Biology
• Animal Communication

Background:

• Odorant-binding proteins (OBPs) are part of the lipocalin superfamily in vertebrates.
• OBPs have dual roles: transporting pheromones to olfactory receptors and aiding pheromone release from glands.

Purpose of the Study:

• To review the literature on vertebrate OBPs.
• To summarize recent findings on their structural and functional properties.
• To explore future research directions for OBPs.

Main Methods:

• Literature review of studies on vertebrate and invertebrate OBPs.
• Comparative analysis of OBP function and structure across species.
• Examination of OBP presence in biological fluids and glands.

Main Results:

• Vertebrate OBPs, primarily in mammals and amphibians, are specifically involved in pheromonal communication.
• Some OBPs in biological secretions exhibit their own pheromonal activity.
• Glycosylation and phosphorylation can enhance OBP affinity and specificity for pheromones.
• Insect OBPs bind general odorants and pheromones, unlike the specialized mammalian OBPs.
• Mammals utilize one OBP family, while insects use multiple families of semiochemical-binding proteins.

Conclusions:

• Mammalian OBPs are exclusively dedicated to pheromonal communication.
• Emerging evidence suggests OBPs can have intrinsic signaling functions.
• Post-translational modifications significantly impact OBP function.
• Significant evolutionary divergence exists in OBP roles between vertebrates and invertebrates.