Disulfide-cross-linked Tau and MAP2 homodimers readily promote microtubule assembly

Luca Di Noto, Michael A. DeTure, Daniel L. Purich

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The neuronal proteins Tau and MAP2 use homologous C-terminal MT-binding regions (MTBRs) to interact with microtubules, F-actin, and intermediate filaments. Although Tau-MTBR is the principal component of pronase-treated Alzheimer paired helical filaments, both Tau and MAP2 form filaments in vitro from disulfide-linked homodimers. That the critical thiol lies within a domain needed for MT binding raised the question: Does disulfide formation block Tau-Tau or MAP2-MAP2 dimer binding to microtubules, thereby acting to divert dimers toward filament formation? We now report that cross-linked Tau and MAP2 homodimers readily promote tubulin polymerization and that monomer and dimer affinity for MTs is surprisingly similar. Therefore, disulfide cross-bridging into homodimers is unlikely to be a drive force for filament formation in Alzheimer's disease.

Original languageEnglish (US)
Pages (from-to)71-76
Number of pages6
JournalMolecular Cell Biology Research Communications
Volume2
Issue number1
DOIs
StatePublished - Jul 1999

ASJC Scopus subject areas

  • Molecular Biology

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