Polypeptide composition of paired helical filaments.

Abstract:

:Immunocytochemical studies using antibodies to cytoskeletal proteins have provided conflicting data on the components of paired helical filaments (PHF), due solely to immunological cross-reactivities. To avoid such ambiguity, we developed a protein chemical approach to the identification of the PHF components. After treatment with formic acid, PHF were digested with lysylendopeptidase and the resultant peptides were separated by HPLC. All major peaks were analysed for their amino acid compositions and sequences. From the PHF digest, proteolytic fragments of ubiquitin, tau and beta protein were sequenced. Ubiquitin in PHF appears to be in a conjugated form, while its target protein remains unidentified. Tau is integrated into PHF at the site of its carboxyl third. The presence of beta protein fragments is best interpreted as being due to contamination of amyloid filaments in the PHF preparation. Thus, ubiquitin and tau are the two definite components of PHF.

journal_name

Ann Med

journal_title

Annals of medicine

authors

Ihara Y,Kondo J

doi

10.3109/07853898909149198

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

121-5

issue

2

eissn

0785-3890

issn

1365-2060

journal_volume

21

pub_type

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