A new class of receptors: Lipids regulate mammalian Gsα-stimulated adenylyl cyclase activities via their membrane anchors
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Abstract
The biosynthesis of cAMP by mammalian membrane-bound adenylyl cyclases (mACs) is predominantly regulated by G-protein-coupled-receptors (GPCRs). Up to now the two hexahelical transmembrane domains of mACs were considered to fix the enzyme to membranes. Here we show that the transmembrane domains serve in addition as signal receptors and transmitters of lipid signals that control Gsα-stimulated mAC activities. We identify aliphatic fatty acids and anandamide as receptor ligands of mAC isoforms 1 to 7 and 9. The ligands enhance (mAC isoforms 2, 3, 7, and 9) or attenuate (isoforms 1, 4, 5, and 6) Gsα-stimulated mAC activities in vitro and in vivo . Substitution of the stimulatory membrane receptor of mAC3 by the inhibitory receptor of mAC5 results in a ligand inhibited mAC5-mAC3 chimera. Thus, we discovered a new class of membrane receptors in which two signaling modalities are at a crossing, direct tonic lipid and indirect phasic GPCR-Gsα signaling regulating the biosynthesis of cAMP.
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In addition, the datademonstrated that the signal most likely originates from the receptor entity and is transmittedthrough the subsequent linker regions to the catalytic dimer
While you're elegant chimera approach suggests lipids are unlikely to have a destabilizing effect, can you rule out an indirect, isoform-specific activating effect?
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permanently
Do you mean "stably"?
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The action of oleic acid on mAC3 was instantaneous and linear for >25 min
Congratulations on the revealing study! I was curious if you have evidence that the lipids are not generally affecting the biophysical proprieties of the membrane and indirectly activating mAC function?
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