The full-length hABHD12 cDNA was cloned into pCMV-Sport6 vector between NotI and SalI restriction sites (GE Life Sciences). The S246A hABHD12 mutant was generated from the same plasmid using Phusion polymerase and DpnI (New England Biolabs) as per manufacturers instructions. Recombinant WT and S246A hABHD12 was generated from HEK293T cells using established transient transfection protocols32 (link). “Mock” control cells were transfected with an empty vector using the same protocol. The cells were harvested by scraping 48 h after transfection, washed with sterile DPBS (3X), resuspended in 1 mL DPBS, and lysed by sonication. The overexpression of hABHD12 was confirmed by gel-based ABPP and western blot analysis on membrane proteomes of the transfected cells, preparations of which are described earlier.