Immunoprecipitation was performed with HEK293T cell lysates of expressing Entry vector (control, Cat# PS100001) or expressing DDK-tagged PON3 (Cat# LY400339). Anti-DDK 4C5-agarose beads were incubated with control lysate or LY400339 overnight at 4C respectively. After washing three times with lysate buffer, 20uL 4x SDS sample buffer was applied. The samples were boiled at 95°C for 10min. The supernatant was loaded to the SDS-PAGE gel after discarded the beads by centrifuging. After transferring to the membrane, the Western blot assay was applied with HRP-conjugated anti-DDK antibody (Cat# TA150030). Lane 1: control lysate; Lane 2: DDK-tagged PON3 (LY400339); Lane 3: anti-DDK 4C5 agarose beads (TA150037) 50uL with control lysate; Lane 4: anti-DDK 4C5 agarose beads (TA150037) 50uL with LY400339.