Technical Data
T1032-74B
Tau (Ser422) (Tau Protein, Microtubule-associated Protein, MAP)
Description:
Tau is a microtubule-associated phosphoprotein (MAP), localized in neuronal axons. It promotes tubulin polymerization and stabilizes microtubules. Tau proteins constitute a family of six isoforms, which range in size from 352 to 441 amino acids. The tau variants differ from each other by the presence of either three or four repeat-regions in the carboxy-terminal part of the molecule and the absence or presence of one or two inserts in the amino-terminal portion.
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-3b transfection phosphorylates serines 199, 202, 235, 396, 404, and 413, and threonines 205 and 231. These sites are among the major abnormal 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). The PHFs are also found in the lesions of other central nervous system disorders.

Applications:
Suitable for use in ELISA and Western Blot. Other applications not tested.

Recommended Dilution:
ELISA: 0.05-0.2ug/ml
Western Blot: 0.5-2ug/ml
Optimal dilutions to be determined by the researcher.

Storage and Stability:
Lyophilized powder may be stored at -20°C. Reconstitute with sterile 40-50% glycerol, aliquot and store at -20°C. Reconstituted product is stable for 12 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.
TypeIsotypeCloneGrade
PabIgGAffinity Purified
SizeStorageShippingSourceHost
40ug-20°CBlue IceHumanRabbit
Concentration:
~0.5mg/ml
Immunogen:
Synthetic non-phosphopeptide (KLH). corresponding to residues surrounding serine 422 of human tau.
Purity:
Purified by immunoaffinity chromatography.
Form
Supplied as a lyophilized powder in PBS, pH 7.4, 0.02% sodium azide.
Specificity:
Recognizes human tau protein, not yet tested for other species.
Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.
1. Haque, N., et al. (1999) Brain Res. 838: 69-77. 2. L Buee et al. (2000) Brain Res Brain Res Rev, 33(1):95-130. .3 G.V.Johnson et al. (2004) J. Cell Sci. 117: 5721-5729.