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Nuanced Interactions between AKAP79 and STIM1 with Orai1 Ca 2+ Channels at Endoplasmic Reticulum-Plasma Membrane Junctions Sustain NFAT Activation

Lin, Yu-Ping; Scappini, Erica; Landaverde, Carlos; Parekh-Glitsch, Frederick; Tucker, Charles J.; Mirams, Gary R.; Parekh, Anant B.

Nuanced Interactions between AKAP79 and STIM1 with Orai1 Ca 2+ Channels at Endoplasmic Reticulum-Plasma Membrane Junctions Sustain NFAT Activation Thumbnail


Authors

Yu-Ping Lin

Erica Scappini

Carlos Landaverde

Frederick Parekh-Glitsch

Charles J. Tucker

Anant B. Parekh



Abstract

A-kinase anchoring protein 79 (AKAP79) is a human scaffolding protein that organizes Ca2+/calmodulin-dependent protein phosphatase calcineurin, calmodulin, cAMP-dependent protein kinase, protein kinase C, and the transcription factor nuclear factor of activated T cells (NFAT1) into a signalosome at the plasma membrane. Upon Ca2+ store depletion, AKAP79 interacts with the N-terminus of STIM1-gated Orai1 Ca2+ channels, enabling Ca2+ nanodomains to stimulate calcineurin. Calcineurin then dephosphorylates and activates NFAT1, which then translocates to the nucleus. A fundamental question is how signalosomes maintain long-term signaling when key effectors are released and therefore removed beyond the reach of the activating signal. Here, we show that the AKAP79-Orai1 interaction is considerably more transient than that of STIM1-Orai1. Free AKAP79, with calcineurin and NFAT1 in tow, is able to replace rapidly AKAP79 devoid of NFAT1 on Orai1, in the presence of continuous Ca2+ entry. We also show that Ca2+ nanodomains near Orai1 channels activate almost the entire cytosolic pool of NFAT1. Recycling of inactive NFAT1 from the cytoplasm to AKAP79 in the plasma membrane, coupled with the relatively weak interaction between AKAP79 and Orai1, maintain excitation-transcription coupling. By measuring rates for AKAP79-NFAT interaction, we formulate a mathematical model that simulates NFAT dynamics at the plasma membrane.

Citation

Lin, Y., Scappini, E., Landaverde, C., Parekh-Glitsch, F., Tucker, C. J., Mirams, G. R., & Parekh, A. B. (2022). Nuanced Interactions between AKAP79 and STIM1 with Orai1 Ca 2+ Channels at Endoplasmic Reticulum-Plasma Membrane Junctions Sustain NFAT Activation. Molecular and Cellular Biology, 42(11), Article e00175-22. https://doi.org/10.1128/mcb.00175-22

Journal Article Type Article
Acceptance Date Aug 18, 2022
Online Publication Date Nov 13, 2022
Publication Date Nov 1, 2022
Deposit Date Nov 2, 2022
Publicly Available Date Mar 29, 2024
Journal Molecular and Cellular Biology
Print ISSN 0270-7306
Electronic ISSN 1098-5549
Publisher American Society for Microbiology
Peer Reviewed Peer Reviewed
Volume 42
Issue 11
Article Number e00175-22
DOI https://doi.org/10.1128/mcb.00175-22
Keywords Cell Biology, Molecular Biology
Public URL https://nottingham-repository.worktribe.com/output/13173652
Publisher URL https://journals.asm.org/doi/10.1128/mcb.00175-22

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