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A three-dimensional model of the Fas/APO-1 molecule: cross-reactivity of anti-Fas antibodies explained by structural mimicry of antigenic sites.

Abstract：

:Fas/APO-1 is a member of the tumor necrosis factor (TNF)/nerve growth factor receptor family. This cell surface protein, when associated with the Fas/APO-1 ligand or specific mAb, elicits an apoptotic response in susceptible cells via an oligomerization of its intracellular domains, termed the'death domains'. We have previously mapped the epitopes of a panel of Fas/APO-1-reactive mAb to a series of linear portions of the Fas/APO-1 molecule. In order to gain a greater understanding of the mode of interaction of these antibodies with the Fas/APO-1 antigen, we constructed a homology-based model of the extracellular portion of the molecule, based on the crystallographic coordinates of the TNF type I receptor. The model clearly demonstrates that the antibodies do not identically mimic the endogenous ligand to achieve their effect, but probably act in an analogous manner by recruiting Fas/APO-1 molecules into clusters which may lead to oligomerization of 'death domains'. Moreover, the apparent cross-reactivity observed for the monoclonal anti-Fas antibodies between different linear regions of the Fas/APO-1 molecule was found to be due, most likely, to the structural mimicry of these epitopes. Reduction of the Fas/APO-1-derived cross-reactive peptides by dithiothreitol completely abrogated their antigenic reactivity with the anti-Fas mAb CH-11, thus indicating that the establishment of intrapeptide disulfide bonds is critical for antigenic reactivity.

journal_name

Int Immunol

journal_title

International immunology

authors

Fadeel B,Lindberg J,Achour A,Chiodi F

doi

10.1093/intimm/10.2.131

subject

Has Abstract

pub_date

1998-02-01 00:00:00

pages

131-40

issue

2

eissn

0953-8178

issn

1460-2377

journal_volume

10

pub_type

杂志文章

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