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. 2024 Jan 29;6(2):273–289. doi: 10.1038/s42255-024-00978-0

Extended Data Fig. 8. Mechanistic model depicting how RalA regulates mitochondrial function in obese adipocytes. Created with BioRender.com.

Extended Data Fig. 8

Obesity drives RalA expression and GTP binding activity, leading to its association with PP2Aa, which in turn recruits the catalytic subunit PP2Ac to dephosphorylate Drp1 S637. Also, catecholamine resistance could reduce PKA-catalyzed S637 phosphorylation. The combined effects converging on RalA-PP2A-Drp1signaling axis result in constitutive mitochondrial translocation of Drp1 and fragmented mitochondria in adipocytes from obese subjects.