NDLI: Abnormal phosphorylation of tau and the mechanism of Alzheimer neurofibrillary degeneration: sequestration of microtubule-associated proteins 1 and 2 and the disassembly of microtubules by the abnormal tau.

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Abnormal phosphorylation of tau and the mechanism of Alzheimer neurofibrillary degeneration: sequestration of microtubule-associated proteins 1 and 2 and the disassembly of microtubules by the abnormal tau.

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Abnormal phosphorylation of tau and the mechanism of Alzheimer neurofibrillary degeneration: sequestration of microtubule-associated proteins 1 and 2 and the disassembly of microtubules by the abnormal tau.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Barra, H. S. Iqbal, K. Alonso, A. D. Grundke-iqbal, I.
Description	Author Affiliation: Alonso AD ( Departmento de Química Biológica, Centro de Investigaciones en Química Biológica de Córdoba, Argentina.);
Abstract	The microtubule-associated protein (MAP) tau is abnormally hyperphosphorylated in Alzheimer disease and accumulates in neurons undergoing neurofibrillary degeneration. In the present study, the associations of the Alzheimer-hyperphosphorylated tau (AD P-tau) with the high molecular weight MAPs (HMW-MAPs) MAP1 and MAP2 were investigated. The AD P-tau was found to aggregate with MAP1 and MAP2 in solution. The association of AD P-tau to the MAPs resulted in inhibition of MAP-promoted microtubule assembly. However, unlike the coaggregation of AD P-tau and normal tau, the association between AD P-tau and the HMW-MAPs did not result in the formation of filaments/tangles. The affinity of the tau-AD P-tau association was higher than that of HMW-MAPs-AD P-tau because normal tau inhibited the latter binding. The association between AD P-tau and the HMW-MAPs also appeared to occur in situ because these proteins cosedimented from the Alzheimer brain extracts, and, in the sediment, the levels of the HMW-MAPs correlated with the levels of AD P-tau. These studies suggested that the abnormally phosphorylated tau can sequester both normal tau and HMW-MAPs and disassemble microtubules but, under physiological conditions, can form tangles of filaments only from tau.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	1
Volume Number	94
Language	English
Publisher	National Academy of Sciences
Publisher Date	1997-02-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Alzheimer Disease Metabolism Microtubule-Associated Proteins Microtubules Tau Proteins Etiology Pathology Binding, Competitive Ultrastructure Phosphorylation Protein Binding Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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