Distinct glycerophospholipids potentiate Gsα-activated adenylyl cyclase activity

• Published in: Cellular signalling 2022-09, Vol.97, p.110396-110396, Article 110396
• Main Authors: Seth, Anubha, Landau, Marius, Shevchenko, Andrej, Traikov, Sofia, Schultz, Anita, Elsabbagh, Sherif, Schultz, Joachim E.
• Format: Article
• Language: English
• Subjects: Adenylyl cyclase; Cyclic AMP; Glycerophospholipids; Membrane anchor; Phosphatidic acid; Receptor
• ISSN: 0898-6568; 1873-3913
• DOI: 10.1016/j.cellsig.2022.110396

Nine mammalian adenylyl cyclases (AC) are pseudoheterodimers with two hexahelical membrane domains, which are isoform-specifically conserved. Previously we proposed that these membrane domains are orphan receptors (https://doi.org/10.7554/eLife.13098; https://doi.org/10.1016/j.cellsig.2020.109538). Lipids extracted from fetal bovine serum at pH 1 inhibited several mAC activities. Guided by a lipidomic analysis we tested glycerophospholipids as potential ligands. Contrary to expectations we surprisingly discovered that 1-stearoyl-2-docosahexaenoyl-phosphatidic acid (SDPA) potentiated Gsα-activated activity of human AC isoform 3 seven-fold. The specificity of fatty acyl esters at glycerol positions 1 and 2 was rather stringent. 1-Stearoyl-2-docosahexaenoyl-phosphatidylserine and 1-stearoyl-2-docosahexaenoyl-phosphatidylethanolamine significantly potentiated several Gsα-activated mAC isoforms to different extents. SDPA appears not interact with forskolin activation of AC isoform 3. SDPA enhanced Gsα-activated AC activities in membranes from mouse brain cortex. The action of SDPA was reversible. Unexpectedly, SDPA did not affect cAMP generation in HEK293 cells stimulated by isoproterenol, PGE2 and adenosine, virtually excluding a role as an extracellular ligand and, instead, suggesting an intracellular role. In summary, we discovered a new dimension of intracellular AC regulation by chemically defined glycerophospholipids. •In all human adenylyl cyclases are Gsalpha stimulation is potentiated by glycerophospholipids.•Preferentially, potentiation is by stearoyl-docosahexaenoyl-phosphatidic acids.•Fatty acyl substitution at positions 1 and 2 are highly specific.•The potentiating effect of phospholipid is observed using membranes from mouse brain cortex.