Functional diversity of GPCR-Gustducin complexes controls signaling output and suppresses alternative pathways.

Several non-taste GPCRs form unproductive GPCR–G gust complexes that stabilize the heterotrimer and suppress basal signaling, unlike GPCRs that induce conventional G gust activation.

• Why it matters: G gust is widely expressed beyond taste cells, but how non-taste GPCRs engage it—and how that shapes signaling output—was unclear.
• What they did: The authors built two biosensors to monitor GPCR–G gust interactions and downstream signaling in living cells, then used pharmacology to characterize G gust activity triggered by non-taste GPCRs.
• The result: Unproductive GPCR–G gust complexes suppress alternative signaling pathways by sequestering receptors from other G proteins, functionally partitioning GPCRs into G gust activators versus inactivators.

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