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Updated: Jul 15, 2026

Studies of Chaperone-Cochaperone Interactions using Homogenous Bead-Based Assay
Published on: July 21, 2021
Peptide binding specificity of the chaperone calreticulin
Noreen Sandhu1, Karen Duus, Charlotte S Jørgensen
1Department of Autoimmunology, Statens Serum Institut, Artillerivej 5, DK-2300 Copenhagen, Denmark.
Calreticulin, a molecular chaperone, binds to specific hydrophobic peptide sequences. Its binding is enhanced by peptide length and hydrophobicity, but hindered by hydrophilic residues.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Chemistry
Background:
- Calreticulin functions as a molecular chaperone.
- It exhibits specificity for both polypeptides and N-linked monoglucosylated glycans.
Purpose of the Study:
- To investigate the polypeptide-binding specificity of calreticulin.
- To determine the fine specificity of calreticulin for different amino acid sequences and compositions.
Main Methods:
- Testing the binding of 127 synthetic peptides of varying lengths and compositions to calreticulin.
- Analyzing binding data using multivariate statistical analysis.
Main Results:
- Hydrophobicity was the strongest predictor of calreticulin-peptide binding.
- Peptides longer than 5 amino acids with hydrophobic sequences showed significant binding.
- Hydrophilic amino acids within a hydrophobic sequence diminished or abolished binding.
- Beta-turn potential disfavored binding.
Conclusions:
- Calreticulin demonstrates a clear peptide-binding specificity for hydrophobic sequences.
- The study delineates the fine specificity of calreticulin, highlighting the importance of hydrophobic amino acid residues and peptide length.
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