Biophysical characterization of the breast cancer-related BIG3-PHB2 interaction: Effect of non-conserved loop region of BIG3 on the structure and the interaction.

Abstract:

:Brefeldin A-inhibited guanine nucleotide-exchange protein 3 (BIG3) interacts with and inhibits the tumor suppressor function of prohibitin-2 (PHB2), and recent in vivo studies have demonstrated that the BIG3-PHB2 interaction is a promising target for breast cancer therapy. However, little biophysical characterization on BIG3 and its interaction with PHB2 has been reported. Here we compared the calculated 8-class secondary structure of the N-terminal domains of BIG family proteins and identified a loop region unique to BIG3. Our biophysical characterization demonstrated that this loop region significantly affects the colloidal and thermodynamic stability of BIG3 and the thermodynamic and kinetic profile of its interaction with PHB2. These results establish a model for the BIG3-PHB2 interaction and an entry for drug discovery for breast cancer.

authors

Chigira T,Nagatoishi S,Takeda H,Yoshimaru T,Katagiri T,Tsumoto K

doi

10.1016/j.bbrc.2019.08.028

subject

Has Abstract

pub_date

2019-10-08 00:00:00

pages

183-189

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(19)31539-6

journal_volume

518

pub_type

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