Interaction of the chaperone calreticulin with proteins and peptides of different structural classes

K Duus, N Sandhu, C S Jørgensen, Paul Robert Hansen, A Steinø, M Thaysen-Andersen, P Højrup, G Houen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The interaction of calreticulin with native and denatured forms and polypeptides in proteolytic digests of proteins representing structural classes of all-alpha-helix (hemoglobin, serum albumin), all-beta-sheet (IgG) and alpha-helix + beta-sheets (lysozyme, ovalbumin) was investigated. The binding of calreticulin to denatured proteins was found to depend on conformation and structural class of the protein. No interaction was observed with the native proteins, whereas binding was seen for the denatured proteins, the order of interaction being lysozyme = IgG > ovalbumin >> hemoglobin = serum albumin. Moreover, the interaction between calreticulin and the heat-denatured proteins depended on the temperature and time used for denaturation and the degree of proteolytic fragmentation. Calreticulin bound well to peptides in proteolytic digests from protease K or chymotrypsin treatment of lysozyme, IgG and ovalbumin but weakly or not at all to peptides in proteolytic digests of hemoglobin and serum albumin. Synthetic peptides from lysozyme and ovalbumin confirmed binding to hydrophobic peptides from these proteins. These results show that calreticulin has the ability to interact with denatured and fragmented forms of proteins with a preference for beta-strand structure and hydrophobicity.
Original languageEnglish
JournalProtein and Peptide Letters
Volume16
Issue number11
Pages (from-to)1414-1423
Number of pages9
ISSN0929-8665
DOIs
Publication statusPublished - 2009

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