Cell
Volume 36, Issue 4, April 1984, Pages 879-888
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Article
Binding of antigen in the absence of histocompatibility proteins by arsonate-reactive T-cell clones

https://doi.org/10.1016/0092-8674(84)90037-0Get rights and content

Abstract

Inducer T-cell clones reactive to the p-azobenzenearsonate (arsonate) hapten possess binding sites for radioactive arsanylated proteins, which are not present on clones with other antigen specificities. Binding occurred in the absence of histocompatibility proteins. Binding was specific for the p-azobenzenearsonate hapten, since unconjugated proteins and proteins conjugated to the nonactivating o-azobenzenearsonate hapten neither bound to the clones nor competed binding of radioactive antigen. One of the clones was studied in more detail, using a panel of structural analogs of arsonate conjugated to the carrier protein ovalbumin. All conjugates that activated the clone in the presence of antigen-presenting cells also competed binding of radioactive antigen in the absence of antigen-presenting cells. Nonactivating conjugates did not compete binding. Based on evidence in this and the succeeding paper (Rao et al., accompanying paper), we suggest that these arsonate-binding sites may include the physiological antigen receptors of arsonate-reactive Tcell clones.

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