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Removal and Replacement of Endogenous Ligands from Lipid-Bound Proteins and Allergens

Removal and Replacement of Endogenous Ligands from Lipid-Bound Proteins and Allergens

Published on: February 24, 2021

Dimerization of lipocalin allergens.

Merja H Niemi¹, Marja Rytkönen-Nissinen^2,3, Ilja Miettinen¹

¹Department of Chemistry and Biocenter Kuopio, University of Eastern Finland, PO BOX 111, 80101 Joensuu, Finland.

Scientific Reports

|September 9, 2015

Summary

Lipocalin allergens, like Bos d 2, can form dimers. Structural analysis reveals these protein dimers are often transient in solution, impacting allergenicity and providing new insights into respiratory allergies.

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Area of Science:

Structural biology
Allergen research
Protein biochemistry

Background:

Lipocalins are significant inhalant animal allergens.
Understanding lipocalin structure is key to understanding allergenicity.
Bovine dander lipocalin Bos d 2 was previously considered monomeric.

Purpose of the Study:

To investigate the structural features of lipocalin allergens.
To determine the oligomeric states of lipocalin allergens.
To analyze the transient dimerization of Bos d 2 and Bos d 5 in solution.

Main Methods:

Determination of crystal structures for bovine dander lipocalin Bos d 2.
Analysis of crystal structures of other lipocalin allergens.
Quantitative characterization of transient dimerization using native mass spectrometry.

Main Results:

Two distinct dimeric crystal structures were determined for Bos d 2.
Oligomeric structures were observed in other analyzed lipocalin allergens, utilizing beta-sheet interactions.
Native mass spectrometry confirmed transient dimerization of Bos d 2 and Bos d 5 in solution.

Conclusions:

Lipocalin allergens can exist as oligomeric structures, particularly dimers.
Dimerization interfaces are moderate, suggesting transient states in solution.
These findings provide insights into lipocalin allergenicity and potential therapeutic targets.