Tau Antibody (Phospho-Ser⁴⁰⁹), pAb, Rabbit

Tau is a microtubule-associated phosphoprotein (MAP) localized in neuronal axons. That promotes tubulin polymerization and microtubules stabilization. Tau proteins constitute a family of six isoforms ranging from 352 to 441 amino acids. The tau variants differ from each other by the presence of either three or four repeated regions in the carboxyl terminal of the molecule and the absence or presence of one or two inserts in the portion ofamino-terminal. Tau is hyperphosphorylated by ERK, GSK-3, TPKII, and CDK5. At least thirty phosphorylation sites have been described including Thr39, Ser46, Thr50, Thr69, Thr153, Thr175, Thr181, Ser198, Ser199, Ser202, Thr205, Ser208, Ser210, Thr212, Ser214, Thr217, Thr231, Ser235, Ser237, Ser241, Ser262, Ser285, Ser305, Ser324, Ser352, Ser356, Ser396, Ser400, Thr403, Ser404, Ser409, Ser412, Ser413, Ser416, and Ser422. Specifically, TPKII phosphorylates serines 202 and 404. GSK-3β transfection phosphorylates serines 199, 202, 235, 396, 404, and 413, and threonines 205 and 231. These sites are among the major atypical phosphorylation sites of tau. Phosphorylation on these sites reduces the ability of a given tau species to promote microtubule self-assembly. Hyperphosphorylated tau is the major protein of the paired helical filaments (PHFs) which make up the pathological neurofibrillary tangles of Alzheimer’s disease (AD). PHFs are also found in the lesions of other central nervous system disorders.GenScript Rabbit Anti-Tau (Phospho-Ser409) Polyclonal Antibody is developed in rabbit using synthetic phospho-peptide (KLH-coupled) corresponding to residues surrounding phospho-serine 409 of human tau.