EnCor Biotechnology
Mouse Monoclonal Antibody to MAP-τ (tau) Cat# MCA-2E9
Description
The MCA-2E9 antibody was raised against a recombinant form of one of the lower molecular weight human tau isoform, specifically the human 441 amino acid htau40 form described by Goedert et al. The epitope for this antibody is located in the peptide KDRVQSKIGSLDNITHVPGG, amino acids 347-366 of the sequence in NP_005901.2. This sequence is expressed in all known human tau isotypes and is totally conserved in all mammals, for exact sequence see Tau-Epitopes.pdf. As a result the antibody will have wide applicability. We have another mouse monoclonal antibody raised against the same form of human tau, MCA-5B10, which binds the peptide HVPGGGNKKIETHKLTFREN, immediately C-terminal to the epitope for MCA-2E9. This is within the ultimate microtubule binding peptide. Both antibodies recognize the unphosphorylated forms of tau, and there is currently no evidence that phosphorylation impacts the binding of either antibody. MCA-5B10 works well on western blots IF, ICC and also for IHC of human brain tissue.
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| Name: | MAP-Tau, mouse monoclonal antibody, Cat# MCA-2E9 |
| Immunogen: | Recombinant full length 441 amino acid human tau |
| HGNC Name: | MAPT |
| UniProt: | P10636 |
| Molecular Weight: | 48-67kDa |
| Host: | Mouse |
| Isotype: | IgG1 heavy, κ light |
| Species Cross-Reactivity: | Human, rat, mouse, cow, pig, horse |
| RRID: | AB_2572349 |
| Format: | Affinity purified antibody at 1mg/mL in 50% PBS, 50% glycerol plus 5mM NaN3 |
| Applications: | WB, IF/ICC, IHC |
| Recommended Dilutions: | WB: 1:2,000. IF/ICC 1:1,000. IHC 1:1,000-1:2,000 |
| Storage: | Store at 4°C for short term, for longer term at -20°C. Avoid freeze / thaw cycles. |
Tau is a low molecular weight member of the microtubule associated protein or MAP family. Several serious human diseases are associated with accumulations of tau protein, most notably the neurofibrillary tangles of Alzheimer's disease. Accumulations of tau in neurons are also characteristic of chronic traumatic encephalopathy, Pick's disease and several other neurodegenerative diseases. Together these disorders are known as "tauopathies". The single mammalian tau gene produces at least 9 different proteins by alternate transcription. In the central nervous system 6 isoforms ranging from 48-67kDa by SDS-PAGE predominate, though larger isotypes are seen mostly in the peripheral nervous system. The tau molecules are very heavily charged and run on SDS-PAGE much more slowly than predicted from their real molecular size. For example the smallest human tau isotype runs at 48kDa on SDS-PAGE but the real molecular weight is 32kDa. Tau proteins are substrates for ser/thr phosphorylation and other post-translational modifications.
Chromogenic immunostaining of a NBF fixed paraffin embedded human brain hippocampus section from an Alzheimer’s Disease case. Mouse mAb to MAPtau, MCA-2E9, dilution 1:1,000, was detected in DAB (brown) using the Vector Labs ImmPRESS method and reagents with citra buffer retrieval. Hematoxylin (blue) was used as the counterstain. The MCA-2E9 antibody strongly labels cell bodies in diseased neurons and is ubiquitously expressed at a lower level in most cells types. This antibody performs well in testing with 4% PFA or standard NBF fixed human and rat tissues. Mouse select image for larger view.
This antibody and also our alternate MAP-τ antibody MCA-5B10 was made against recombinant human 3-repeat MAP-τ, the smallest isoform. The immunogen sequence was based on that in NP_005901.2 which was inserted into the eukaryotic expression vector pET30a(+) which adds an N-terminal His-tag and some other sequence, underlined below. This sequence includes a thrombin cleavage site (blue), an S-tag affinity peptide (red) and an enterokinase cleavage site (green).
MHHHHHHSSG LVPRGSGMKE TAAAKFERQH MDSPDLGTDD DDKAMADIGS EFPRQEFEV 60
MEDHAGTYGL GDRKDQGGYT MHQDQEGDTD AGLKESPLQT PTEDGSEEPG SETSDAKSTP 120
TAEDVTAPLV DEGAPGKQAA AQPHTEIPEG TTAEEAGIGD TPSLEDEAAG HVTQARMVSK 180
SKDGTGSDDK KAKGADGKTK IATPRGAAPP GQKGQANATR IPAKTPPAPK TPPSSGEPPK 240
SGDRSGYSSP GSPGTPGSRS RTPSLPTPPT REPKKVAVVR TPPKSPSSAK SRLQTAPVPM 300
PDLKNVKSKI GSTENLKHQP GGGKVQIINK KLDLSNVQSK CGSKDNIKHV PGGGSVQIVY 360
KPVDLSKVTS KCGSLGNIHH KPGGGQVEVK SEKLDFKDRV QSKIGSLDNI THVPGGGNKK 420
IETHKLTFRE NAKAKTDHGA EIVYKSPVVS GDTSPRHLSN VSSTGSIDMV DSPQLATLAD 480
EVSASLAKQG L 491
Number of amino acids: 491
Molecular weight: 51281.82
Theoretical pI: 6.84
Amino acid composition:
Ala (A) 39 7.9%
Arg (R) 16 3.3%
Asn (N) 11 2.2%
Asp (D) 36 7.3%
Cys (C) 2 0.4%
Gln (Q) 20 4.1%
Glu (E) 29 5.9%
Gly (G) 54 11.0%
His (H) 19 3.9%
Ile (I) 16 3.3%
Leu (L) 23 4.7%
Lys (K) 47 9.6%
Met (M) 10 2.0%
Phe (F) 4 0.8%
Pro (P) 45 9.2%
Ser (S) 50 10.2%
Thr (T) 37 7.5%
Trp (W) 0 0.0%
Tyr (Y) 5 1.0%
Val (V) 28 5.7%
1. Weingarten, M. D., Lockwood, A. H., Hwo, S.-Y. and Kirschner, M. W. A protein factor essential for microtubule assembly. Proc. Nat. Acad. Sci. USA 72:1858–1862 (1975).
2. Cleveland, D. W., Hwo, S. Y., Kirschner, M. W. Purification of tau, a microtubule-associated protein that induces assembly of microtubules from purified tubulin. J Mol Biol. 116:207-25 (1977).
3. Goedert, M., Spillantini, M. G. A century of Alzheimer’s disease. Science 314:777–81 (2006).
4. Ballatore, C., Lee, V. M., Trojanowski, J. Q. Tau-mediated neurodegeneration in Alzheimer’s disease and related disorders. Nat. Rev. Neurosci. 8:663–72 (2007).
5. Wolfe, M. S. Tau mutations in neurodegenerative diseases. J. Biol. Chem. 284:6021-25 (2009).
6. Goedert M, Spillantini MG, Crowther RA. Cloning of a big tau microtubule-associated protein characteristic of the peripheral nervous system. PNAS 89:1983-7 (1992).
7. Boyne LJ, Tessler A, Murray M, Fischer I. Distribution of Big tau in the central nervous system of the adult and developing rat. J. Comp. Neurol. 358:279-93 (1995).
8. Goedert M, et al. Multiple Isoforms of human microtubule-associated protein in tau: Sequences and localization in neurofibrillary tangles of Alzheimer's disease. Neuron 3:519-526 (1989).
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