P-tau217
P-tau217
Phosphorylation of tau at threonine 217 (P-tau217) is a critical post-translational modification that influences tau’s interaction with microtubules, thereby affecting neuronal stability and function. This phosphorylation event is primarily mediated by specific kinases, notably glycogen synthase kinase 3 beta (GSK-3β), a proline-directed protein kinase (PDPK). GSK-3β phosphorylates tau at serine or threonine residues followed by a proline residue, a characteristic of PDPKs.
Under normal physiological conditions, P-tau217 is a regulated process that modulates its affinity for microtubules, facilitating dynamic changes in the cytoskeleton necessary for neuronal function. However, when P-tau217 becomes dysregulated, it can lead to pathological changes in tau protein behavior, including the formation of neurofibrillary tangles—a hallmark of neurodegenerative diseases such as Alzheimer’s disease.
P-tau217, along with other phosphorylation sites, contributes to the destabilization of microtubules, impairing axonal transport and neuronal communication. This disruption is associated with cognitive decline and other neurological impairments observed in tauopathies.
