A conserved docking surface on calcineurin mediates interaction with substrates and immunosuppressants.

A conserved docking surface on calcineurin mediates interaction with substrates and immunosuppressants.
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DOI:
10.1016/j.molcel.2009.01.030
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发表时间:
2009-03-13
期刊:
影响因子:
16
通讯作者:
Redondo, Juan Miguel
Redondo, Juan Miguel
中科院分区:
生物学1区
文献类型:
--
作者:
Rodriguez, Antonio;Roy, Jagoree;Martinez-Martinez, Sara;Lopez-Maderuelo, Maria Dolores;Nino-Moreno, Perla;Orti, Leticia;Pantoja-Uceda, David;Pineda-Lucena, Antonio;Cyert, Martha S.;Redondo, Juan Miguel

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The phosphatase calcineurin, target of the immunosuppressants cyclosporin A and FK506, dephosphorylates NFAT transcription factors to promote immune activation and development of the vascular and nervous systems. NFAT interacts with calcineurin through distinct binding motifs: the PxIXIT and LxVP sites. While many calcineurin substrates contain PxIxIT motifs, the generality of LxVP-mediated interactions is unclear. We define critical residues in the LxVP motif, and demonstrate its binding to a hydrophobic pocket at the interface of the two calcineurin subunits. Mutations in this region disrupt binding of mammalian calcineurin to NFATc1, and interaction of yeast calcineurin with substrates including Rcn1, which contains an LxVP motif. These mutations also interfere with calcineurin-immunosuppressant binding, and an LxVP-based peptide competes with immunosuppressant-immunophilin complexes for binding to calcineurin. These studies suggest that LxVP-type sites are a common feature of calcineurin substrates and that immunosuppressant-immunophilin complexes inhibit calcineurin by interfering with this mode of substrate recognition.
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