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Localization of Specific Epitopes on Human Microtubule‐Associated Protein 2
Author(s) -
Kalcheva N.,
Albala J. S.,
Binder L. I.,
ShafitZagardo B.
Publication year - 1994
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1046/j.1471-4159.1994.63062336.x
Subject(s) - epitope , epitope mapping , microtubule associated protein , microbiology and biotechnology , amino acid , monoclonal antibody , fusion protein , western blot , biology , linear epitope , microtubule , gene isoform , biochemistry , antibody , chemistry , recombinant dna , genetics , gene
Microtubule‐associated protein 2 (MAP‐2) is an abundant neuronal cytoskeletal protein that binds to tubulin and stabilizes microtubules. Using fusion protein constructs we have defined the epitopes of 10 monoclonal antibodies (mAbs) to discrete regions of human MAP‐2. Proteins were expressed in pATH vectors. After electrophoresis, immunoblotting was performed. By western blot analysis five of the mAbs (AP‐14, AP‐20, AP‐21, AP‐23, and AP‐25) share epitopes with only the high molecular weight isoforms (MAP‐2a, MAP‐2b); two of the mAbs (AP‐18 and tau 46) recognize MAP‐2a, MAP‐2b, and MAP‐2c. Although AP‐18 immunoreactivity was detected within heat‐stable protein homogenates isolated from a human neuroblastoma cell line MSN, fusion protein constructs encompassing human MAP‐2 were negative, suggesting that the AP‐18 epitope is phosphorylated. Furthermore, AP‐18 immunoreactivity was lost after alkaline phosphatase treatment of heat‐stable protein preparations from MSN cells. Four of the mAbs (322, 636, 635, and 39) recognize epitopes located within amino acids 169–219 of human MAP‐2. AP‐21 maps to a region between amino acids 553 and 645. AP‐23 maps between amino acids 645 and 993, whereas AP‐20, AP‐14, and AP‐25 map between amino acids 995 and 1332. Expression of the region of MAP‐2 between amino acids 1787 and 1824 was positive to tau 46.