Identification and characterization of a ligand-independent oligomerization domain in the extracellular region of the CD95 death receptor

被引:125
作者
Papoff, G
Hausler, P
Eramo, A
Pagano, MG
Di Leve, G
Signore, A
Ruberti, G
机构
[1] CNR, Inst Cell Biol, I-00016 Monterotondo, Rome, Italy
[2] Univ Roma La Sapienza, Med Clin 2, NuMED Grp, I-00161 Rome, Italy
关键词
D O I
10.1074/jbc.274.53.38241
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The CD95 death receptor plays an important role in several physiological and pathological apoptotic processes involving in particular the immune system. CD95 ligation leads to clustering of the receptor cytoplasmic "death domains" and recruitment of the zymogen form of caspase-8 to the cell surface. Activation of this protease through self-cleavage, followed by activation of downstream effector caspases, culminates in cleavage of a set of cellular proteins resulting in apoptosis with disassembly of the cell. It is very well known that the extracellular region of the CD95 receptor is required for CD95L interaction and that the death domain is necessary for the induction of the apoptotic signaling. Here, we identified and characterized a novel CD95 ligand- and death domain-independent oligomerization domain mapping to the NH2-terminal extracellular region of the CD95 receptor. In vitro and in vivo studies indicated that this domain, conserved among all soluble CD95 variants, mediates homo-oligomerization of the CD95 receptor and of the soluble CD95 proteins, as well as hetero-oligomerization of the receptor with the soluble variants. These results offer new insight into the mechanism of apoptosis inhibition mediated by the soluble CD95 proteins and suggest a role of the extracellular oligomerization domain in the regulation of the non-signaling state of the CD95 receptor.
引用
收藏
页码:38241 / 38250
页数:10
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