当前位置： SCI文献检索 > BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS期刊下所有文献 > Isothermal titration calorimetry and vesicle leakage assays highlight the differential behaviors of tau repeat segments upon interaction with anionic lipid membranes.

Isothermal titration calorimetry and vesicle leakage assays highlight the differential behaviors of tau repeat segments upon interaction with anionic lipid membranes.

Abstract：

:Tau misfolding has been implicated in a variety of tauopathies, including Alzheimer's disease. The microtubule binding domain of tau consists of four repeat segments (R1-R4), and aggregation of these segments leads to the formation of neurofibrillary tangles. Previous studies indicate that misfolded tau associates with anionic phospholipid membranes, invoking structural transformations that could play a role in aggregation. Here, we investigated the role of membrane surface charge on the binding affinity of individual tau repeat segments, and whether these segments exhibit lytic activity. We quantified the thermodynamics of this process in terms of the affinity (Kd), enthalpy (ΔH), entropy (ΔS), and change in specific heat capacity (ΔCp). While neutral membranes exhibited weak interactions with each tau repeat segment, segments R2 and R3 exhibited relatively strong binding with anionic membranes with favorable ΔS and a negative value of ΔCp. Calcein leakage assays show that each repeat segment displays lytic activity, but only upon the interaction with anionic membranes. Taken together, these results distinguish the relative selectivity for anionic membranes by each repeat segment and the degree of membrane disruption that results.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Dicke SS,Tatge L,Engen PE,Culp M,Masterson LR

doi

10.1016/j.bbrc.2017.10.007

subject

Has Abstract

pub_date

2017-12-02 00:00:00

pages

1504-1509

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(17)31969-1

journal_volume

493

pub_type

杂志文章

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