Direct binding between Orai1 and AC8 mediates dynamic interplay between Ca2+ and cAMP signaling

Debbie Willoughby, Katy L Everett, Michelle Louise Halls, Jonathan Pacheco, Philipp Skroblin, Luis Vaca, Enno Klussmann, Dermot M F Cooper

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93 Citations (Scopus)


The interplay between calcium ion (Ca 2+) and cyclic adenosine monophosphate (cAMP) signaling underlies crucial aspects of cell homeostasis. The membrane-bound Ca 2+-regulated adenylyl cyclases (ACs) are pivotal points of this integration. These enzymes display high selectivity for Ca 2+ entry arising from the activation of store-operated Ca 2+ (SOC) channels, and they have been proposed to functionally colocalize with SOC channels to reinforce crosstalk between the two signaling pathways. Using a multidisciplinary approach, we have identified a direct interaction between the amino termini of Ca 2+-stimulated AC8 and Orai1, the pore component of SOC channels. High-resolution biosensors targeted to the AC8 and Orai1 microdomains revealed that this protein-protein interaction is responsible for coordinating subcellular changes in both Ca 2+ and cAMP. The demonstration that Orai1 functions as an integral component of a highly organized signaling complex to coordinate Ca 2+ and cAMP signals underscores how SOC channels can be recruited to maximize the efficiency of the interplay between these two ubiquitous signaling pathways.
Original languageEnglish
Pages (from-to)1 - 11
Number of pages11
JournalScience Signaling
Issue number219
Publication statusPublished - 2012
Externally publishedYes

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