Assay Report Card

ID: ALA3707962

Type: Binding

Description: Biological Assay: Endothelial lipase (EL) and hepatic lipase (HL) activities were measured using a fluorescent substrate, A10070, (Invitrogen, CA) doped into an artificial vesicle containing DMPG (Avanti Polar Lipids) as the excipient. Vesicles were prepared by combining 571 uL of 29 mM DMPG in a 1:1 mixture of MeOH and CHCl3 with 2000 uL of 1 mM A10070 in a 1:1 mixture of MeOH and CHCl3. The mixture was dried under nitrogen in multiple vials then resuspended in 20 mL total volume of 50 mM HEPES pH 8.0 buffer containing 50 mM NaCl and 0.2 mM EDTA. The sample was allowed to sit at room temperature for 15 min and then was sonicated 3x4 mins on ice with a Branson Sonicator using duty cycle 1. This preparation provides vesicles with a mole fraction of 0.11 for the FRET substrate.The enzymatic assay was measured using 384-well white Optiplates. Each well contained 20 uL of assay buffer (50 mM HEPES pH 8.0, 50 mM NaCl and 1 mM CaCl2) and 0.25 uL of a DMSO solution containing a compound.