Calcineurin is essential in cyclosporin A- and FK506-sensitive yeast strains.

Journal Article (Journal Article)

The immunophilin-immunosuppressant complexes cyclophilin-cyclosporin A (CsA) and FKBP12-FK506 inhibit the phosphatase calcineurin to block T-cell activation. Although cyclophilin A, FKBP12, and calcineurin are highly conserved from yeast to man, none had previously been shown to be essential for viability. We find that CsA-sensitive yeast strains are FK506 hypersensitive and demonstrate that calcineurin is required for viability in these strains. Mutants lacking cyclophilin A or FKBP12 are resistant to CsA or FK506, respectively. Thus, both the immunosuppressive and the antifungal actions of CsA and FK506 result from calcineurin inhibition by immunophilin-drug complexes. In yeast strains in which calcineurin is not essential, calcineurin inhibition or mutation of calcineurin confers hypersensitivity to LiCl or NaCl, suggesting that calcineurin regulates cation transport.

Full Text

Duke Authors

Cited Authors

  • Breuder, T; Hemenway, CS; Movva, NR; Cardenas, ME; Heitman, J

Published Date

  • June 7, 1994

Published In

Volume / Issue

  • 91 / 12

Start / End Page

  • 5372 - 5376

PubMed ID

  • 7515500

Pubmed Central ID

  • PMC43997

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.91.12.5372


  • eng

Conference Location

  • United States