Tau protein microtubule-binding region (Tau MTBR)

The tau protein microtubule-binding region (Tau MTBR) is a conserved domain in the tau protein (also known as MAPT) essential for regulating the stabilization and dynamics of neuronal microtubules. Located in the carboxy-terminal portion of tau, the MTBR contains three or four imperfect tandem repeats (R1–R4, depending on isoform) that bind along the interface of α- and β-tubulin heterodimers in microtubules, promoting their assembly and stability[1][2][3][5][6][7]. This binding is mediated by positively charged residues on tau and is dynamically regulated; it is modulated by posttranslational modifications, especially phosphorylation, which reduces microtubule affinity and leads to detachment and aggregation of tau in pathological states such as Alzheimer’s disease and other tauopathies[2][3][5][6][7]. Dysfunction of the microtubule-binding region, via mutation or hyperphosphorylation, results in tau aggregation and neurofibrillary tangle formation, a key marker of neurodegenerative diseases. While no drugs are directly approved to target the microtubule-binding region, it is a validated therapeutic target under active investigation for its key role in neurodegeneration and potential as a biomarker for disease progression and therapeutic efficacy[2][7].

Other names

Tau microtubule-binding domainTau MTBRMAPT microtubule-binding regionMicrotubule-binding domain of tauTau MTBD

Inhibition of tau aggregation; Stabilization of microtubule-binding; Inhibition of tau phosphorylation (kinase inhibitors); Promotion of tau clearance (antibody-mediated); Other