I was working with luciferase assay to see the ability of my compound as a ligand for receptor. The result somehow does not follow dose dependent manner. it reachs optimum fold change at low concentration and decrease after that ( in this case the optimum concentration is 1.56 microg/ml). After 1.56 microg/ml, as the concentration increase, the luciferase activity decrease. I have come across regarding the high affinity ligand binding. Does anyone have other opinions? I need more explanation of why the luciferase activity decrease. Tq in advance. I would appreciate if there is an attachment of journal too. Tq

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