FASEB J.
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The FASEB Journal, Vol 2, 2376-2379, Copyright © 1988 by The Federation of American Societies for Experimental Biology

RESEARCH COMMUNICATIONS

Myositis autoantibody reactivity and catalytic function of threonyl- tRNA synthetase

CV Dang, EM Tan and JA Traugh
Department of Biochemistry, University of California, Riverside 92521.

Spontaneously occurring autoantibody to threonyl-tRNA synthetase found in the serum of patients with polymyositis and experimentally induced antibody against highly purified rabbit reticulocyte threonyl-tRNA synthetase were used to analyze the epitopes of threonyl-tRNA synthetase. The PL-7 autoantibody reacted with the native but not the denatured form of threonyl-tRNA synthetase, whereas the experimentally induced antibody recognized both the native and denatured forms of the enzyme. In addition, the PL-7 autoantibody specifically inhibited threonyl-tRNA synthetase activity whereas the experimentally induced antibody had no effect on aminoacylation. Thus, the epitopes recognized by the PL-7 autoantibody are formed by the tertiary structure of the enzyme and are associated with the catalytic site of the synthetase whereas the experimentally induced antibody recognizes epitopes formed by primary sequences not related to the catalytic function of the synthetase.




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Copyright © 1988 by The Federation of American Societies for Experimental Biology.