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. 1993 Jul 15;90(14):6815–6819. doi: 10.1073/pnas.90.14.6815

Cloning and characterization of cyclophilin C-associated protein: a candidate natural cellular ligand for cyclophilin C.

J Friedman 1, M Trahey 1, I Weissman 1
PMCID: PMC47023  PMID: 8341703

Abstract

We report the protein purification and the cloning and characterization of a cDNA encoding the proteins that bind with high affinity to cyclophilin C (Cyp-C) in the absence of cyclosporin A. Transfection of this cDNA into COS cells directs the production of a glycoprotein of 77 kDa that binds to Cyp-C in the absence, but not the presence, of cyclosporin A. Homology comparisons reveal that this protein and gene, termed CyCAP for Cyp-C-associated protein, possess a cysteine-rich domain (scavenger receptor cysteine-rich domain) found in a variety of cell-surface molecules; the rest of the sequence is apparently specific. This result raises the possibility that Cyp-C serves as a mediator or regulator of an as-yet-unidentified signal or cellular process initiated via the Cyp-C-associated protein.

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