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Isolation of Bcl-2 binding proteins that exhibit homology with BAG-1 and suppressor of death domains protein.

Abstract：

:The Bcl-2 oncoprotein is a potent inhibitor of apoptosis and is overexpressed in a variety of different malignancies. Bcl-2 function is regulated through heterodimerization with other members of the Bcl-2 protein family. In addition, several proteins that are not members of the Bcl-2 family can bind to Bcl-2, including BAG-1 protein. In this study, we screened for proteins that bind to Bcl-2, and isolated two additional members of the BAG-1 protein family, BAG-3 and BAG-4. The BAG-4 protein that we cloned also corresponds to the recently isolated suppressor of death domains (SODD) protein, a molecule that binds and inhibits signaling by tumor necrosis factor receptor 1 (TNFR1). Both BAG-3 and BAG-4/SODD were found to physically associate with Bcl-2, and both proteins are well conserved from human to mouse. A region of homology, comprising 68 amino acids, is present in the carboxyl termini of BAG-3 and BAG-4/SODD, and this region corresponds with sequences termed BAG domains that are found in other members of the BAG-1 protein family. In BAG-3 and BAG-4/SODD, the BAG domains appear to constitute the Bcl-2 binding regions of these molecules. BAG-3 and BAG-4/SODD, like BAG-1, were also shown to bind to Hsp70 inside the cell. Moreover, BAG-3 overexpression modestly inhibited apoptosis resulting from cytokine deprivation of IL-3-dependent 32D cells. Together, our findings demonstrate that other members of the BAG-1 protein family, namely BAG-3 and BAG-4/SODD, bind to Bcl-2 and provide a potential link between pathways regulated by Bcl-2 and pathways regulated by Hsp70, as well as TNFR1.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Antoku K,Maser RS,Scully WJ Jr,Delach SM,Johnson DE

doi

10.1006/bbrc.2001.5512

subject

Has Abstract

pub_date

2001-09-07 00:00:00

pages

1003-10

issue

5

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(01)95512-3

journal_volume

286

pub_type

杂志文章

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