FKBP12 binds the inositol 1,4,5-trisphosphate receptor at leucine- proline (1400-1401) and anchors calcineurin to this FK506-like domain

Andrew M. Cameron, Frederick C. Nucifora, Eric T. Fung, David J. Livingston, Robert A. Aldape, Christopher A. Ross, Solomon H. Snyder

Research output: Contribution to journalArticle

Abstract

The immunophilin FKBP12 is one of the most abundant and conserved proteins in biology. It is the primary receptor for the immunosuppressant actions of the drug FK506 in whose presence FKBP12 binds to and inhibits calcineurin, disrupting interleukin formation in lymphocytes. The physiologic functions of FKBP12 are less clear, although the protein has been demonstrated to physiologically interact with the inositol 1,4,5- trisphosphate receptor (IP3R), the ryanodine receptor, and the type 1 transforming growth factor β receptor. We now report that FKBP12 binds the IP3R at residues 1400-1401, a leucyl-prolyl dipeptide epitope that structurally resembles FK506. We further demonstrate that binding to IP3R at this site enables FKBP12 to interact with calcineurin, presumably to anchor the phosphatase to IP3R and modulate the receptor's phosphorylation status. We propose that FK506 promotes an FKBP12-calcineurin interaction by mimicking structurally similar dipeptide epitopes present within proteins that use FKBP12 to anchor calcineurin to the appropriate physiologic substrates.

Original languageEnglish (US)
Pages (from-to)27582-27588
Number of pages7
JournalJournal of Biological Chemistry
Volume272
Issue number44
DOIs
StatePublished - Oct 31 1997

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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