KIST Gangneung Institute of Natural Products 1 article published in JoVE Biochemistry Assay for Phosphorylation and Microtubule Binding Along with Localization of Tau Protein in Colorectal Cancer Cells Md Nazmul Huda1,2, Erdenedolgor Erdene-Ochir1,2, Cheol-Ho Pan1,2 1Systems Biotechnology Research Center, KIST Gangneung Institute of Natural Products, 2Division of Bio-Medical Science & Technology, KIST School, Korea University of Science and Technology This manuscript describes standard protocols for measuring tau hyperphosphorylation, measuring tau binding to microtubules, and localization of intracellular tau following drug treatments. These protocols can be used repetitively for screening drugs or other compounds that target tau hyperphosphorylation or microtubule binding.