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PhosphoSitePlus® Resource

  • Additional protein information
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REACTIVITY SENSITIVITY MW (kDa) SOURCE
50-80 Rabbit

Product Usage Information

Storage: Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM NaCl, 100 µg/ml BSA and 50% glycerol. Store at –20°C. Do not aliquot the antibody.

Specificity / Sensitivity

Phospho-Tau (Ser400/Thr403/Ser404) Antibody recognizes endogenous levels of tau protein when phosphorylated at Ser400 or Thr403 or Ser404. This antibody also detects dual phosphorylation at Ser400/Thr403, Ser400/Ser404, or Thr403/Ser404, and triple phosphorylation at Ser400/Thr403/Ser404.


Source / Purification

Polyclonal antibodies are produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Ser400/Thr403/Ser404 of human tau protein. Antibodies are purified by protein A and peptide affinity chromatography.

Tau is a heterogeneous microtubule-associated protein that promotes and stabilizes microtubule assembly, especially in axons. Six isoforms with different amino-terminal inserts and different numbers of tandem repeats near the carboxy terminus have been identified, and tau is hyperphosphorylated at approximately 25 sites by Erk, GSK-3, and CDK5 (1,2). Phosphorylation decreases the ability of tau to bind to microtubules. Neurofibrillary tangles are a major hallmark of Alzheimer's disease; these tangles are bundles of paired helical filaments composed of hyperphosphorylated tau. In particular, phosphorylation at Ser396 by GSK-3 or CDK5 destabilizes microtubules. Furthermore, research studies have shown that inclusions of tau are found in a number of other neurodegenerative diseases, collectively known as tauopathies (1,3).


Investigators have shown that tau phosphorylation at Ser404 destabilizes microtubules and that tau is hyperphosphorylated at Ser404 in Alzheimer's disease (4-7).


1.  Johnson, G.V. and Stoothoff, W.H. (2004) J Cell Sci 117, 5721-9.

2.  Hanger, D.P. et al. (1998) J Neurochem 71, 2465-76.

3.  Bramblett, G.T. et al. (1993) Neuron 10, 1089-99.

4.  Hanger, D.P. et al. (1998) J Neurochem 71, 2465-76.

5.  Shiurba, R.A. et al. (1996) Brain Res 737, 119-32.

6.  Evans, D.B. et al. (2000) J Biol Chem 275, 24977-83.

7.  Bertrand, J. et al. (2010) Neuroscience 168, 323-34.


Entrez-Gene Id 4137
Swiss-Prot Acc. P10636-8


For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.

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Phospho-Tau (Ser400/Thr403/Ser404) Antibody