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Effect of polymorphisms on ligand binding by mouse major urinary proteins
A Darwish Marie1, C Veggerby, D H Robertson
1Department of Veterinary Preclinical Sciences, University of Liverpool, Liverpool, L69 3BX, United Kingdom.
Protein Science : a Publication of the Protein Society
|March 27, 2001
Summary
Mouse urine major urinary proteins (lipocalins) exhibit high polymorphism. A specific variant with a cavity substitution significantly alters fluorescent probe binding, impacting chemical communication and pheromone detection.
Area of Science:
- Biochemistry
- Animal Behavior
- Proteomics
Background:
- Mouse urine contains major urinary proteins (lipocalins) crucial for semiochemical slow release.
- These proteins are highly polymorphic, with minor sequence variations among individuals.
Purpose of the Study:
- To purify and characterize major urinary protein variants from inbred mice.
- To investigate the functional impact of protein polymorphism on ligand binding.
Main Methods:
- Purification of four major urinary protein variants to homogeneity.
- Characterization using mass spectrometry.
- Analysis of fluorescent probe binding affinity and fluorescence yield.
Main Results:
- Discovery of a novel protein variant.
- Three surface variants showed no impact on probe binding.
- A fourth variant with a Phe to Val substitution in the binding cavity exhibited reduced probe affinity and fluorescence.
Conclusions:
- Protein structural variations, particularly in the binding cavity, can influence ligand interactions.
- This suggests potential specificity in the calyx-binding site for different ligands.
- Findings have implications for understanding pheromone binding and chemical communication in mice.