Reversible beta-pleated sheet formation of a phosphorylated synthetic tau peptide.

Abstract:

:Serine416 of human tau protein is believed to be phosphorylated in Alzheimer neurofibrillary tangles. We synthesized a fragment of tau, consisting of amino acids 408-421 in both non-phosphorylated and serine416-phosphorylated forms. Circular dichroism in a trifluoroethanol-water mixture indicated a beta-turn----beta-pleated sheet conformational transition upon phosphorylation. The beta-structure formation is intermolecular and can be inhibited by addition of Ca2+ ions or a phosphorylated tripeptide, but not with its non-phosphorylated analog. The presence of the phosphorylated tau peptide did not facilitate the formation of beta-pleated sheets of a phosphorylated neurofilament fragment. Multivalent cations induced a conformational transition of this phosphorylated neurofilament peptide, but the effect was less specific than the transition induced in the tau fragment, and it could also be reversed with the competing phosphorylated tripeptide.

authors

Lang E,Szendrei GI,Elekes I,Lee VM,Otvos L Jr

doi

10.1016/s0006-291x(05)80112-3

subject

Has Abstract

pub_date

1992-01-15 00:00:00

pages

63-9

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)80112-3

journal_volume

182

pub_type

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