Journal
NATURE STRUCTURAL & MOLECULAR BIOLOGY
Volume 19, Issue 3, Pages 337-U100Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb.2238
Keywords
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Funding
- National Center for Research Resources at the US National Institutes of Health [RR15-301]
- US DOE [DE-AC02-06CH11357]
- US National Institutes of Health [AI40127, MH080291, AI090428]
- Pacific Mountain Affiliate
- [T32NS007083]
- [T32HD041697]
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In hippocampal neurons, the scaffold protein AKAP79 recruits the phosphatase calcineurin to L-type Ca2+ channels and couples Ca2+ influx to activation of calcineurin and of its substrate, the transcription factor NFAT. Here we show that an IAIIIT anchoring site in human AKAP79 binds the same surface of calcineurin as the PxIxIT recognition peptide of NFAT, albeit more strongly. A modest decrease in calcineurin-AKAP affinity due to an altered anchoring sequence is compatible with NFAT activation, whereas a further decrease impairs activation. Counterintuitively, increasing calcineurin-AKAP affinity increases recruitment of calcineurin to the scaffold but impairs NFAT activation; this is probably due to both slower release of active calcineurin from the scaffold and sequestration of active calcineurin by 'decoy' AKAP sites. We propose that calcineurin-AKAP79 scaffolding promotes NFAT signaling by balancing strong recruitment of calcineurin with its efficient release to communicate with NFAT.
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