Binding Properties and Structural Analysis of β-Lactoglobulin

β-Lactoglobulin is the principal whey protein in bovine milk, belonging to the lipocalin family and characterised by an eight-stranded antiparallel β-barrel that forms a central hydrophobic cavity. This fold endows the protein with the ability to bind a diverse range of ligands, notably fatty acids, retinol and other apolar molecules, while additional sites at the dimer interface accommodate more polar or bulky compounds. The protein exists in a pH-dependent equilibrium between monomer and dimer, with intermolecular β-sheet interactions and electrostatic contacts stabilising the dimeric form at neutral pH. Structural analyses using X-ray crystallography, nuclear magnetic resonance and computational docking have elucidated the precise geometry of the binding calyx and conformational switches—particularly the EF loop—that govern ligand entry and release. Mass spectrometry and chemical labelling approaches have further revealed the thermal resilience of specific regions and the stepwise unfolding transitions that modulate allergenicity and functional performance. Together, these studies underpin practical applications ranging from targeted nutrient delivery and encapsulation in food and pharmaceutical matrices to the design of engineered variants with tailored binding affinities and enhanced stability.

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Binding Properties and Structural Analysis of β-Lactoglobulin publication trend

The graph below shows the total number of articles in binding properties and structural analysis of β-lactoglobulin across all publications each year (not limited to Nature Index journals).

Technical terms

Lipocalin: A family of small β-barrel proteins that transport hydrophobic molecules in aqueous environments.

Calyx: The internal cavity formed by β-strands in the β-lactoglobulin fold, serving as the primary hydrophobic binding site.

Dimerisation: The reversible association of two monomer units, stabilised by β-sheet and electrostatic interactions, affecting ligand accessibility and protein stability.

EF loop: A flexible segment linking β-strands E and F, whose conformational shift regulates opening of the binding calyx.

Mass spectrometry: An analytical technique to identify and quantify protein conformational changes via detection of labelled residues.

Molecular docking: A computational method that predicts how small molecules bind to protein structures by sampling possible orientations and conformations.

References

1. Regioselective analysis of heat-induced conformational changes of β-lactoglobulin by quantitative liquid chromatography–mass spectrometry analysis of chemical labeling kinetics. Food Chemistry (2024).
2. β-Lactoglobulin Binds Palmitate within Its Central Cavity*. Journal of Biological Chemistry (1999).
3. Manipulating Monomer-Dimer Equilibrium of Bovine β-Lactoglobulin by Amino Acid Substitution*. Journal of Biological Chemistry (2002).
4. β-Lactoglobulin's Conformational Requirements for Ligand Binding at the Calyx and the Dimer Interphase: a Flexible Docking Study. PLOS ONE (2013).
5. EF Loop Conformational Change Triggers Ligand Binding in β-Lactoglobulins*. Journal of Biological Chemistry (2003).