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Updated: Jun 11, 2025

Real-time Analyses of Retinol Transport by the Membrane Receptor of Plasma Retinol Binding Protein
Published on: January 28, 2013
Structural basis of selective beta-carotene binding by a soluble protein
Nikita A Egorkin1, Eva E Dominnik2, Roman I Raevskii3
1A.N. Bach Institute of Biochemistry, Federal Research Centre of Biotechnology of the Russian Academy of Sciences, 33 Leninsky prospect, building 1, Moscow 119071, Russia; M.V. Lomonosov Moscow State University, School of Biology, 1 Lenin Hills, building 12, Moscow 119991, Russia.
Locust beta-carotene binding protein (BBP) structure reveals a unique hydrophobic tunnel for efficient beta-carotene (BCR) transport. This discovery offers potential for BBP as a BCR solubilizer.
Area of Science:
- Biochemistry
- Structural Biology
- Animal Physiology
Background:
- Beta-carotene (BCR) is a vital nutrient and antioxidant, but its hydrophobicity hinders distribution in aqueous environments.
- Existing carotenoproteins inefficiently bind BCR, preferring oxygenated carotenoids.
Purpose of the Study:
- Determine the crystal structure of beta-carotene binding protein (BBP) from locusts complexed with BCR.
- Investigate BBP's binding mechanism and specificity for carotenoids.
Main Methods:
- X-ray crystallography was used to determine the BBP-BCR complex structure.
- Biochemical assays were performed to assess BBP's binding affinity for various carotenoids.
Main Results:
- The crystal structure reveals BBP as an antiparallel homodimer with a long hydrophobic tunnel accommodating BCR.
- BBP binds BCR with high specificity, accepting some xanthophylls but rejecting lycopene.
- The structure also shows BBP in complex with a Takeout 1 protein.
Conclusions:
- BBP possesses a unique structural mechanism for binding and transporting BCR.
- The findings suggest potential applications for BBP in BCR solubilization and delivery systems.
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